Hi Marek,

I think that this recent thread answers a lot of your questions, and will be well worth reading.

Regarding the lack of volume from your 88 db speakers, based on the observations you have described I suspect that the spec is inaccurate, and significantly overstates their sensitivity. 180 watts into 88 db speakers should easily produce higher than sensible volume levels in an 11 x 12 room.

Also, when you consider new speakers keep in mind that speaker sensitivity is often specified based on an input of 2.83 volts, rather than 1 watt. 2.83 volts corresponds to 1 watt into 8 ohms, so if the speaker's impedance is 8 ohms it makes no difference which way the number is defined. However, if the speaker's impedance is 4 ohms subtract 3 db to convert 2.83 volt sensitivity to 1 watt sensitivity (or more precisely, 1 watt efficiency). If the speaker's impedance is 6 ohms subtract 1.25 db to do that conversion.

Best regards,

-- Al

I think that this recent thread answers a lot of your questions, and will be well worth reading.

Perhaps not as important as impedance, but a lot of popular brands out there have disappointingly low sensitivity (85-86 dB). Why is that?One basic reason is that efficiency, deep bass extension, and physical size trade off with one another. If you want to increase efficiency you have to sacrifice deep bass extension and/or make the cabinet larger. Also, many speakers are designed with the expectation that they will be used with solid state amps, which can provide large amounts of power at much lower cost than a tube amp of comparable quality and power capability.

Regarding the lack of volume from your 88 db speakers, based on the observations you have described I suspect that the spec is inaccurate, and significantly overstates their sensitivity. 180 watts into 88 db speakers should easily produce higher than sensible volume levels in an 11 x 12 room.

Also, when you consider new speakers keep in mind that speaker sensitivity is often specified based on an input of 2.83 volts, rather than 1 watt. 2.83 volts corresponds to 1 watt into 8 ohms, so if the speaker's impedance is 8 ohms it makes no difference which way the number is defined. However, if the speaker's impedance is 4 ohms subtract 3 db to convert 2.83 volt sensitivity to 1 watt sensitivity (or more precisely, 1 watt efficiency). If the speaker's impedance is 6 ohms subtract 1.25 db to do that conversion.

Best regards,

-- Al