I use a zero global negative amp - happens to be PP but could be a typical SET. I'm therefore concerned with speaker damping. A helpful post suggested the following:
"You want to use a woofer with a fairly low Qms (as compared with the Qes); for instance, you'd rather have a Qms value less than 10 times the Qes value. A low Qms means that the suspension is providing a great deal of the restoring (damping) force for the woofer, while a high Qms means that the woofer is relying on the amplifier to provide the damping electrically - which your amps will not do a good job of. If you're investigating kits or DIY, take a look at the Qms and Qes values, rather than just using the Qts."
thoughts please? amongst the drivers below which (or which others not mentioned) are excellent for other parameters like low distortion and flat frequency response.
I enclose ratios (Qm/Qe) for some possible choices.
a) Up to 6.5 ins dia. Rank order is lowest 2 to highest 6.5 :
SEAS H421-MP14RC
Jordan JX92S
Vifa P13WG-00-08
Dynaudio 15W75
SEAS H422-MP14RCY
Vifa P11WG-00-08
Morel MW142
Audax AT130MO
Audax AT100MO
Peerless 832592
SEAS H395-P14RC
Audax HT100MO
Bandor 100mm
SEAS H422-MP14RCY/P
Audax HT100KO
SEAS H423-P14RC4Ydc
SEAS H454-P11RC
Scan 13MB
Focal 5K023
Audax HT130KO
SEAS H393-P14RCY
SEAS H521-P11RCY/P
Scan 13M-8636
b) 6.5 ins to 8 ins Rank order is lowest 1.5 to highest 7.7:
SEAS H403-CB17RC
SEAS H353-P17RC
Dynaudio 17W75
Dynaudio 17W75EXT
SEAS H404-CB17RCY
Accuton C²92-6
SEAS H352-P17RCY
SEAS H524-P17RC/P
Morel MW166
SEAS H424-P17RC4
Dynaudio 17W75XL
SEAS H548-P17RCY/P
SEAS H416-P17REX
SEAS H528-P17RE/P
Audax HT170KO
Audax BMH404
Accuton C²92-2x6
SEAS H425-P17RC4Y
Dynaudio 19W38
Scan 18WPP
Accuton C²94-13
Scan 18W-8544
Accuton C²94-8
Cabasse 17NDB
Scan 18W-8546
Cabasse 17NDLB
Cabasse 17NDB bass
Scan 18W-8545
"You want to use a woofer with a fairly low Qms (as compared with the Qes); for instance, you'd rather have a Qms value less than 10 times the Qes value. A low Qms means that the suspension is providing a great deal of the restoring (damping) force for the woofer, while a high Qms means that the woofer is relying on the amplifier to provide the damping electrically - which your amps will not do a good job of. If you're investigating kits or DIY, take a look at the Qms and Qes values, rather than just using the Qts."
thoughts please? amongst the drivers below which (or which others not mentioned) are excellent for other parameters like low distortion and flat frequency response.
I enclose ratios (Qm/Qe) for some possible choices.
a) Up to 6.5 ins dia. Rank order is lowest 2 to highest 6.5 :
SEAS H421-MP14RC
Jordan JX92S
Vifa P13WG-00-08
Dynaudio 15W75
SEAS H422-MP14RCY
Vifa P11WG-00-08
Morel MW142
Audax AT130MO
Audax AT100MO
Peerless 832592
SEAS H395-P14RC
Audax HT100MO
Bandor 100mm
SEAS H422-MP14RCY/P
Audax HT100KO
SEAS H423-P14RC4Ydc
SEAS H454-P11RC
Scan 13MB
Focal 5K023
Audax HT130KO
SEAS H393-P14RCY
SEAS H521-P11RCY/P
Scan 13M-8636
b) 6.5 ins to 8 ins Rank order is lowest 1.5 to highest 7.7:
SEAS H403-CB17RC
SEAS H353-P17RC
Dynaudio 17W75
Dynaudio 17W75EXT
SEAS H404-CB17RCY
Accuton C²92-6
SEAS H352-P17RCY
SEAS H524-P17RC/P
Morel MW166
SEAS H424-P17RC4
Dynaudio 17W75XL
SEAS H548-P17RCY/P
SEAS H416-P17REX
SEAS H528-P17RE/P
Audax HT170KO
Audax BMH404
Accuton C²92-2x6
SEAS H425-P17RC4Y
Dynaudio 19W38
Scan 18WPP
Accuton C²94-13
Scan 18W-8544
Accuton C²94-8
Cabasse 17NDB
Scan 18W-8546
Cabasse 17NDLB
Cabasse 17NDB bass
Scan 18W-8545