Author: claimsbot

1. A compound of formula I, or II, or III:
wherein:
M is molybdenum or tungsten;
R1 is optionally substituted
each of R2 and R3 is independently R, \u2014OR, \u2014SR, \u2014N(R)2, \u2014OC(O)R, \u2014SOR, \u2014SO2R, \u2014SO2N(R)2, \u2014C(O)N(R)2, \u2014NRC(O)R, or \u2014NRSO2R;
R2\u2032 and R3\u2032 are taken together with M to form an optionally substituted 3-8 membered saturated or partially unsaturated ring having, in addition to M, 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur;
each of R4 and R5 is independently halogen, R, \u2014N(R)2, \u2014NRC(O)R, \u2014NRC(O)OR, \u2014NRC(O)N(R)2, \u2014NRSO2R, \u2014NRSO2N(R)2, \u2014NROR, \u2014OR, \u2014OSi(R)3, \u2014OAra, or an optionally substituted group selected from a 5-6 membered monocyclic heteroaryl ring having at least one nitrogen and 0-3 additional heteroatoms independently selected from nitrogen, oxygen, or sulfur, a 3-7 membered saturated or partially unsaturated heterocyclic ring having at least one nitrogen and 0-2 additional heteroatoms independently selected from nitrogen, oxygen, or sulfur, a 7-10 membered bicyclic saturated or partially unsaturated heterocyclic ring having at least one nitrogen and 0-4 additional heteroatoms independently selected from nitrogen, oxygen, or sulfur, or an 8-10 membered bicyclic heteroaryl ring having at least one nitrogen and 0-4 additional heteroatoms independently selected from nitrogen, oxygen, or sulfur;
Ara is
m is 0-3;
Ring B is an optionally substituted group selected from phenyl or a 5-6 membered monocyclic heteroaryl ring having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur;
p is 1-5;
q is 0-5;
t is 0-4;
each of Ring B\u2032, Ring C and Ring D is independently an optionally substituted group selected from phenyl, a 3-7 membered saturated or partially unsaturated carbocyclic ring, an 8-10 membered bicyclic saturated, partially unsaturated or aryl ring, a 5-6 membered monocyclic heteroaryl ring having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, a 3-7 membered saturated or partially unsaturated heterocyclic ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, a 7-10 membered bicyclic saturated or partially unsaturated heterocyclic ring having 1-5 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or an 8-14 membered bicyclic or tricyclic heteroaryl ring having 1-5 heteroatoms independently selected from nitrogen, oxygen, or sulfur;
each R7 is independently halogen, R, \u2014CN, \u2014NO2, \u2014OR, \u2014SR, \u2014S(O)R, \u2014S(O)2R, \u2014OSi(R)3, \u2014N(R)2, \u2014NRC(O)R, \u2014NRC(O)OR, \u2014NRC(O)N(R)2, \u2014NRSO2R, \u2014NRSO2N(R)2, or \u2014NROR;
each of Rx, Ry and Rz is independently an electron-withdrawing group;
each R is independently hydrogen or an optionally substituted group selected from C1-20 aliphatic, C1-20 heteroaliphatic, phenyl, a 3-7 membered saturated or partially unsaturated carbocyclic ring, an 8-10 membered bicyclic saturated, partially unsaturated or aryl ring, a 5-6 membered monocyclic heteroaryl ring having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, a 3-7 membered saturated or partially unsaturated heterocyclic ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, a 7-10 membered bicyclic saturated or partially unsaturated heterocyclic ring having 1-5 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or an 8-10 membered bicyclic heteroaryl ring having 1-5 heteroatoms independently selected from nitrogen, oxygen, or sulfur; or:
two R groups are optionally taken together with the intervening atoms to form an optionally substituted 3-10 membered, monocyclic or bicyclic, saturated, partially unsaturated, or aryl ring having, in addition to the intervening atoms, 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur;

n is 0-2; and
each R6 is independently a neutral ligand.
2. The compound of claim 1, wherein the compound is a compound of formula I, and one of R2 and R3 is hydrogen and the other is optionally substituted C1-20 aliphatic.
3. The compound of claim 1, wherein the compound is a compound of formula II, and R2\u2032 and R3\u2032 are taken together with M to form an optionally substituted 3-membered ring.
4. The compound of claim 1, wherein the compound is a compound of formula I or II, and each of R4 and R5 is independently \u2014OR, \u2014OSi(R)3, or \u2014OAra.
5. The compound of claim 4, wherein each of R4 and R5 is \u2014OR, wherein R is optionally substituted phenyl.
6. The compound of claim 4, wherein each of R4 and R5 is triflate, \u2014O-2,6-(CHPh2)2-4-MeC6H2, DFTO, \u2014OC(CF3)3 or \u2014OC(C6F5)3.
7. The compound of claim 4, wherein M is tungsten.
8. The compound of claim 7, wherein R1 is
9. The compound of claim 1, wherein the compound is a compound of formula III, and each of R4 and R5 is independently \u2014Cl.
10. The compound of claim 9, wherein M is tungsten.
11. The compound of claim 1, wherein n is 1.
12. The compound of claim 11, wherein R6 is a bidentate ligand, and R6 is 1,2-dimethoxyethane (DME).
13. The compound of claim 1, wherein n is 0.
14. The compound of claim 1, wherein the compound is selected from:
W(NArCl3)(CHCMe3)(OTf)2(DME), W(NArCl3)(CHCMe3)(2,5-Me2Pyr)2, W(NArBr3)(CHCMe3)(OTf)2(DME), W(NArCl2CF3)2(CHCMe3)(OTf)2(DME), W(NAr(CF3)2)(CHCMe3)(OTf)2(DME), Mo(NC6F5)(CHCMe2Ph)(OTf)2(DME), Mo(NC6F5)(CHCMe2Ph)(Me2Pyr)2, Mo(NC6F5)(CHCMe2Ph)OC(CF3)32, Mo(NC6F5)(CHCMe2Ph)OC(C6F5)32, Mo(NC6F5)(CHCMe2Ph)(ODFT)2, W(NC6F5)(CH-t-Bu)(DME)(OTf)2, W(NC6F5)(CH-t-Bu)(THF)2(OTf)2, W(NC6F5)(CH-t-Bu)(DME)(THF)(OTf)2, W(NC6F5)(CH-t-Bu)(\u03bc-DME)(OTf)2x, W(NC6F5)(CH-t-Bu)(DME)(Pyr)2, W(NC6F5)(CH-t-Bu)(DME)OC(CF3)32, W(NC6F5)(CH-t-Bu)OC(C6F5)32, W(NC6F5)(CH-t-Bu)(ODFT)2, Mo(NC6F5)(CHCMe2Ph)(Me2Pyr)(HMTO), W(NC6F5)(CH-t-Bu)(dme)1.5(Pyr)2, W(NC6F5)(CHCMe2Ph)(Me2Pyr)(HMTO), W(NArCl3)(CH-t-Bu)(Pyr)(DFTO), W(NArCl3)(CH-t-Bu)(Pyr)(HMTO), W(NArCl3)(CH-t-Bu)(Pyr)(HIPTO), W(NArBr3)(CH-t-Bu)(Pyr)(DFTO), W(NArBr3)(CH-t-Bu)(Pyr)(HMTO), W(NArBr3)(CH-t-Bu)(Pyr)(HIPTO), W(NArCl2CF3)(CH-t-Bu)(Pyr)(DFTO), W(NArCl2CF3)(CH-t-Bu)(Pyr)(HMTO), W(NArCl2CF3)(CH-t-Bu)(Pyr)(HIPTO), W(NAr(CF3)2)(CH-t-Bu)(Pyr)(DFTO), W(NAr(CF3)2)(CH-t-Bu)(Pyr)(HMTO), W(NAr(CF3)2)(CH-t-Bu)(Pyr)(HIPTO), W(NArCl3)(CH-t-Bu)(ORF6), W(NArCl3)(CH-t-Bu)(ORF9), W(NArBr3)(CH-t-Bu)(ORF6), W(NArBr3)(CH-t-Bu)(ORF9), W(NArCl2CF3)(CH-t-Bu)(ORF6), W(NArCl2CF3)(CH-t-Bu)(ORF9), W(NAr(CF3)2)(CH-t-Bu)(ORF6), W(NAr(CF3)2)(CH-t-Bu)(ORF9), W(NArCl3)(CHCMe3)(Me2Pyr)(OHMT), W(NArCl3)(CHCMe3)(Me2pyr)(ODFT), W(NArCl3)(CHCMe3)(Me2pyr)(OTript), W(NArCl3)(CHCMe3)(ODBMP)2, W(NArBr3)(CHCMe3)(ODBMP)2, W(NArCl2CF3)(CHCMe3)(ODBMP)2, W(NAr(CF3)2)(CHCMe3)(ODBMP)2, W(NAr(CF3)2)(CHCMe3)(ODBMP)2.2DME, W(NArCl)(CHCMe3)(OTf)2(dme), W(NArCl)(CHCMe3)(ODBMP)2, W(NArF)(CHCMe3)(OTf)2(dme), W(NArF)(CHCMe3)(ODBMP)2, W(NAr\u2032)(CHCMe3)(OTf)2(dme), W(NAr\u2032)(CHCMe3)(ODBMP)2, W(NAr\u2033)(CHCMe2Ph)(OTf)2(dme), W(NAr\u2033)(CHCMe2Ph)(ODBMP)2, W(NC6F5)(CH2CH2CH2)OC(CF3)32, Mo(NC6F5)2Cl2(DME), W(NC6F5)2Cl2(DME), Mo(NC6F5)2(CH2CMe2Ph)2, Mo(NC6F5)2(CH2CMe2Ph)2(Et2O), W(NC6F5)2(CH2CMe3)2, W(NArCl3)2Cl2(DME), W(NArCl3)2(CH2CMe3)2, W(NArBr3)2Cl2(DME), W(NArBr3)2(CH2CMe3)2, W(NArCl2CF3)2Cl2(DME), W(NArCl2CF3)2(CHCMe3)2, W(NAr(CF3)2)2Cl2(DME), and W(NAr(CF3)2)2(CH2CMe3)2,
wherein ArCl3 is 2,4,6-trichlorophenyl, ArBr3 is 2,4,6-tribromophenyl, ArCl2CF3 is 2,6-dichloro-4-(trifluoromethyl)phenyl, Ar(CF3)2 is 3,5-bis(trifluoromethyl)phenyl, ORF6 is hexafluoro-tert-butoxide (\u2014OCMe(CF3)2), ORF9 is perfluoro-tert-butoxide (\u2014OC(CF3)3), Ar\u2032 is 2,6-Me2C6H3, and Ar\u2033 is 3,5-Me2C6H3.
15. A compound having the structure of:
or HO-2,6-(CHPh2)2-4-MeC6H2,
or a salt thereof.
16. A method for preparing a compound of claim 1, comprising steps of:
1) providing a first compound having the structure of formula IV:
2) reacting the first compound with a compound having the structure of R1NSO.
17. A method for preparing a compound of claim 1, comprising providing a first compound having the structure of formula R1N(R)Si(R)3.
18. The method of claim 17, further comprising providing a compound having the structure of M(R4)6.
19. The method of claim 18, wherein M(R4)6 is WCl6.
20. A method for performing a metathesis reaction, comprising providing a compound of formula I.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

1. A grass-cutting head with an axis of rotation, the grass-cutting head comprising:
a body forming a housing for at least one spool of cutting line, provided with at least one outlet hole for an end of said cutting line wound on said spool, said body comprising a projection and a substantially cylindrical surface, said projection having a shape of a portion of a spiral, said projection gradually projecting from said substantially cylindrical surface of said body, said projection ending with an end surface, said end surface intersecting said substantially cylindrical surface, said outlet hole being arranged on said end surface;
a guide channel in communication with said at least one outlet hole for receiving the cutting line, said guide channel extending from the inside of said housing towards the outlet hole and having an inclined shape, gradually moving away from said axis of rotation, said guide channel being provided in said projection, said guide channel defining a radially outward concave guiding surface formed in said body, said concave guiding surface having a concavity facing the axis of rotation, wherein a portion of said cutting line inside said guide channel has a concave path in an operating phase and a non-operating phase, said concave path being the same in said operating phase and in said non-operating phase.
2. Grass-cutting head as claimed in claim 1, wherein said outlet hole is on a surface inclined by an angle differing from 90\xb0 with respect to a radial plane containing the axis of rotation and passing through the center of the hole.
3. Grass-cutting head as claimed in claim 2, wherein the outlet hole defines a direction of projection of the line from the body of the head which is not radial and inclined by an angle between 30\xb0 and 90\xb0 with respect to a radial direction.
4. A grass-cutting head as claimed in claim 2, wherein the outlet hole defines a direction of projection of the line from the body of the head which is not radial and inclined by an angle between 60\xb0 and 90\xb0 with respect to a radial direction.
5. Grass-cutting head as claimed in claim 1, wherein said guide channel has an approximately spiral shape, said at least one projection spanning substantially half of a circumference of said body.
6. Grass-cutting head as claimed in claim 5, wherein the surface on which the outlet hole is located forms with a radial plane an angle between 0\xb0 and 80\xb0.
7. Grass-cutting head as claimed in claim 5, wherein the surface on which the outlet hole is located has a substantially radial extension with respect to the axis of rotation of the head.
8. Grass-cutting head as claimed in claim 5, wherein the surface on which the outlet hole is located forms with a radial plane an angle between 0\xb0 and 45\xb0.
9. Grass-cutting head as claimed in claim 5, wherein the surface on which the outlet hole is located forms with a radial plane an angle between 0\xb0 and 30\xb0.
10. Grass-cutting head as claimed in claim 1, wherein the outlet hole defines a direction of projection of the line from the body of the head which is not radial and inclined by an angle between 30\xb0 and 90\xb0 with respect to a radial direction.
11. Grass-cutting head as claimed in claim 1, wherein the outlet hole defines a direction of projection of the line from the body of the head which is not radial and inclined by an angle between 60\xb0 and 90\xb0 with respect to a radial direction.
12. A grass-cutting head as claimed in claim 1, wherein a portion of said cutting line extends from the inside of said housing through said guide channel and said at least one outlet hole to a position located outside of said projection.
13. Grass-cutting head as claimed in claim 1, wherein said projection is made integral with said body, with the same material of which said body is formed or with a different material.
14. A grass-cutting head, the grass-cutting head comprising:
a spool of cutting line;
a grass-cutting head body forming a housing for said spool of cutting line, said body being movable about an axis of rotation, said body comprising a cylindrical outer surface and a side surface formed by a series of spiral portions arranged one after another, said spiral portions being defined by at least two projections extending from said cylindrical outer surface, each of said projections comprising an inner projection surface, each of said at least two projections having a first end and a second end, wherein a thickness of said at least projection increases from said first end to said second end, each of said at least projections extending in a circumferential direction of said body, each of said at least one projections having an end surface located at said second end, said end surface comprising an outlet hole, said inner projection surface defining at least a portion of a guide channel extending from an interior portion of said housing to said outlet hole, said outlet hole being in communication with said guide channel, wherein a portion of said cutting line extends from the interior portion of said housing through said guide channel and said at least one outlet hole to a position located outside of said body and said at least one projection
wherein one end of said guide channel is located at a first distance from said axis of rotation, another end of said guide channel being located at a second distance from the axis of rotation, said another end of said guide channel being adjacent to said end surface, said second distance being greater than said first distance, wherein each of said at least two projections spans substantially half of a circumference of said body.
15. A grass-cutting head in accordance with claim 14, wherein said channel extends in an inclined direction, said channel having an inclined shape, said thickness of said at least one projection at said first end being less than said thickness of said at least one projection at said second end.
16. A grass-cutting head in accordance with claim 15, wherein said at least one projection has a shape of a portion of a spiral.
17. A grass-cutting head in accordance with claim 16, wherein said end surface intersects said substantially cylindrical surface.
18. A grass-cutting head, the grass-cutting head comprising:
a spool of cutting line;
a grass-cutting head housing comprising a recess, said recess receiving said spool of cutting line, said grass-cutting head housing being movable about an axis of rotation, said grass-cutting head housing comprising an outer surface defining at least a substantially cylindrical outer wall portion and at least one projection, said at least one projection comprising an inner projection surface and an outer projection surface, said outer projection surface and said inner projection surface extending about said axis of rotation, said at least one projection having a first end and a second end, said first end being adjacent to one portion of said substantially cylindrical outer wall portion, said second end being adjacent to another portion of said substantially cylindrical outer wall portion, said at least one projection having a thickness extending in a radial direction from said substantially cylindrical outer wall portion, wherein said thickness of said at least one projection increases from said first end to said second end in a circumferential direction of said grass-cutting head, said outer projection surface extending from said first end to said second end in said circumferential direction to define an outer circumferential portion of said body, said at least one projection having an end surface located at said second end, said end surface defining at least a portion of an outlet hole, said inner projection surface defining at least a portion of a guide channel extending from a position at or adjacent to said recess to said outlet hole, said outlet hole being in communication with said guide channel, wherein a portion of said cutting line extends from the interior portion of said housing through said guide channel and said at least one outlet hole to a position located outside of said at least one projection, said portion of said cutting line extending in said circumferential direction in a rotating state of said grass cutting head, said portion of said cutting line extending in said circumferential direction in a non-rotating state of said grass cutting head
wherein one end of said guide channel is located at a first distance from said axis of rotation, another end of said guide channel being located at a second distance from the axis of rotation, said another end of said guide channel being adjacent to said end surface, said second distance being greater than said first distance, wherein each of said at least one projection spans substantially half of a circumference of said body.
19. A grass-cutting head in accordance with claim 18, wherein said channel extends in an inclined direction such that said channel has an inclined shape, said thickness of said at least one projection at said first end being less than said thickness of said at least one projection at said second end.
20. A grass-cutting head in accordance with claim 19, wherein said at least one projection has a shape of a portion of a spiral.
21. A grass-cutting head in accordance with claim 20, wherein said end surface is substantially perpendicular to said substantially cylindrical outer wall portion.

1. A deployment system for treating a bifurcation of a main vessel and first and second branch vessels, comprising:
an elongate, flexible body, having a proximal end and a distal end;
a single stent carried by the distal end of the body, the single stent comprising a proximal, upstream end, and a distal, downstream end, and a stent wall extending therebetween;
a releasable restraint, for retaining the stent on the flexible body, the releasable restraint comprising an axially moveable outer sheath having a lubricious layer, wherein a distal end of the lubricious layer is spaced proximally from the outer sheath’s distal end, thereby providing a section of the releasable restraint at the outer sheath’s distal end region that is free of the lubricious layer; and
a distal tip comprising an annular recess formed therein configured to receive the releasable restraint’s distal end, wherein the annular recess at least partially overlaps the lubricious layer;
wherein the distal, downstream end of the stent is larger in diameter than the proximal, upstream end of the stent in an unconstrained expanded configuration, and wherein the stent wall defines a single central lumen and is radially symmetrically disposed about the longitudinal axis of the flexible body when retained on the body.
2. A deployment system as in claim 1, further comprising a guidewire lumen extending axially through at least a portion of the flexible body.
3. A deployment system as in claim 2, wherein the guidewire lumen has a proximal access port and a distal access port, and the proximal access port is positioned along the flexible body, spaced distally apart from the proximal end.
4. A deployment system as in claim 2, wherein the guidewire lumen has a proximal access port and a distal access port, and the proximal access port is positioned at the proximal end of the flexible body.
5. A deployment system as in claim 1, wherein the releasable restraint comprises an axially movable control element extending along a length of the flexible body.
6. A deployment system as in claim 1, wherein the releasable restraint further comprises a pull wire.
7. A deployment system as in claim 1, wherein the releasable restraint further comprises a dissolvable media.
8. A deployment system as in claim 1, wherein the expanded diameter of the single stent tapers radially outwardly in the distal direction.
9. A deployment system as in claim 1, wherein the stent wall is configured to contact and support a wall of the bifurcation from the proximal, upstream end to the distal, downstream end when the stent is deployed in the bifurcation.
10. A deployment system as in claim 1, wherein the stent is uncovered.
11. A deployment system as in claim 1, wherein the lubricious layer is spaced a distance within the range of from about 1 mm to about 3 mm from the outer sheath’s distal end.
12. A deployment system as in claim 1, wherein the releasable restraint comprises a plurality of expansion limiting bands.
13. A deployment system as in claim 1, wherein the stent comprises a drug capable of being eluted over time.
14. A stent deployment catheter, comprising:
an elongate, flexible tubular body, having a proximal end and a distal end;
a noncylindrical, self-expandable stent carried by the distal end, the stent comprising a proximal end, a distal end, and a stent wall extending therebetween, the stent distal end having a larger diameter than the stent proximal end in an unconstrained expanded configuration, wherein the stent is positioned on the distal end of the tubular body such that the stent distal end is located distally relative to the stent proximal end;
a releasable restraint comprising an axially moveable sheath, covering the noncylindrical, self-expandable stent, wherein a distal portion of the sheath comprises a lubricious layer spaced proximally from a distal end of the sheath;
a distal tip comprising an annular recess formed therein configured to receive the distal end of the sheath, wherein the annular recess at least partially overlaps the lubricious layer; and
a handpiece on the proximal end, wherein the handpiece comprises a control and first and second indicia that indicate partial and complete uncovering of the stent with the sheath when the control is aligned with said first and second indicia, respectively, and wherein the control is configured to be moved from an initial position in which the stent is covered to said first and second indicia.
15. A stent deployment catheter as in claim 14, further comprising a guidewire lumen, in an over the wire configuration.
16. A stent deployment catheter as in claim 14, further comprising a guidewire lumen, in a rapid exchange configuration.
17. A stent deployment catheter as in claim 14, wherein the indicia comprises a marking on the handpiece.
18. A stent deployment catheter as in claim 14, wherein the indicia provides tactile feedback to indicate when said control is aligned with said indicia.
19. A deployment system as in claim 14, wherein the stent comprises a drug capable of being eluted over time.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

1. A class AB amplifier configured for true ground operation for a system having a DC-coupled speaker, the amplifier comprising:
an input;
a primary output stage having associated therewith a first feedback loop to the input; and
a secondary stage having associated therewith a second feedback loop to the input, wherein the secondary stage is configured to be at least one of connectable gradually to the DC-coupled speaker upon switch-on of the system and disconnected gradually from the DC-coupled speaker upon switch-off of the system, and the primary output stage is respectively configured to be at least one of connected after the gradual connection of the secondary stage and disconnected before the gradual disconnection of the secondary stage.
2. The class AB amplifier according to claim 1, wherein the secondary stage is connectable to the DC-coupled speaker by a switch.
3. The class AB amplifier according to claim 2, wherein the switch is arranged to be operable with pulse width modulation with a variable mark-space ratio whereby the secondary stage is connectable gradually upon switch-on to the DC-coupled speaker.
4. The class AB amplifier according to claim 1, wherein the input is connectable to either the first feedback loop or the second feedback loop by a feedback switch.
5. The class AB amplifier according to claim 1, wherein the second feedback loop comprises a DC-offset cancelling unit.
6. The class AB amplifier according to claim 5, wherein the DC-offset cancelling unit comprises a series arrangement of a comparator, an integrator, and an amplifier.
7. A method of controlling a class AB amplifier configured for true ground operation during switch-on, the amplifier having an input, a primary output stage having a first feedback loop switchably connectable to the input, and a secondary stage having a second feedback loop separately switchably connectable to the input, the method comprising:
connecting the second feedback loop to the input, gradually connecting the secondary stage to a DC-coupled speaker;
and thereafter connecting the primary stage to the DC-coupled speaker;
disconnecting the second feedback loop; and
connecting the first feedback loop to the input.
8. The method of claim 7, wherein gradually connecting the secondary stage to the speaker comprises:
applying a pulse wave modulation signal to the secondary stage; and
varying on-time of the pulse wave modulation signal from substantially 0% to substantially 100%.
9. A method of controlling a class AB amplifier configured for true ground operation during switch-off, the amplifier having an input, a primary output stage having a first feedback loop switchably connectable to the input, and a secondary stage having a second feedback loop separately switchably connectable to the input, the method comprising:
disconnecting, with a machine the primary stage to the DC-coupled speaker;
disconnecting the first feedback-loop and connecting the second feedback loop to the input; and
gradually disconnecting the secondary stage to the DC-coupled speaker.
10. The method of claim 9, wherein gradually disconnecting the secondary stage to the speaker comprises:
applying a pulse wave modulation signal to the secondary stage; and
varying on-time of the pulse wave modulation signal from substantially 100% to substantially 0%.
11. The method of claim 7, further comprising:
using the second feedback loop to cancel DC-offset while the second feedback loop is connected to the input.
12. The method of claim 9, wherein a feedback signal in the second feedback loop is compared to ground, integrated, and amplified.
13. The class AB amplifier of claim 1, wherein the DC-coupled speaker is coupled between an output of the primary output stage and ground.
14. The class AB amplifier of claim 1, further comprising:
a positive supply; and
a negative supply, wherein the class AB amplifier is symmetrical about ground.