Class A 30 Watt Amps: Are they enough to drive my book shelfs?

Currently looking at buying a Pass Labs XA 30.5 to drive my Kef 201/2 speakers which are rated at 86 DB sensitivity. Is this a bad move?

puffbojie11-06-2019 7:14am

georgehifi Details Discussions Posts This discussion 10,312 posts 11-06-2019 at 07:26am Copy Comment URL Report Comment Edit Delete "Just" enough if you don’t want to party, the 60.5 would be ideal but they are monoblocks and much more expensive. If the Kefs were a 4ohm load and less then the 30.5 would be giving out around 60w But if you have a look at the impedance graph the Kefs average more like 6-8ohm, then the 30.5 is a little under powered. https://www.stereophile.com/images/archivesart/708KEFfig1.jpg Cheers George
kijanki Details Discussions Posts This discussion Message User 4,428 posts 11-06-2019 at 08:26am Copy Comment URL Report Comment Edit Delete For your 8 ohm speakers efficiency=sensitivity. Driven by 1W they will deliver 86dB sound level. 30W (30:1 ratio) should give you about 15dB more resulting in 101dB. It should cover even symphony orchestra (EU directive limits level to 85dB in order to protect musicians). Efficiency is defined as loudness at 1W power at 1m distance in open space. Since average room is not an open space (sound is amplified by reflections) it can be assumed to be the same in whole room (unless room is very large).
roberjerman Details Discussions Posts This discussion Message User 4,319 posts 11-06-2019 at 10:14am Copy Comment URL Report Comment Edit Delete YES! Doubling the power to 60wpc will only give you 3db more headroom. And if you want an increase of 10db (twice as loud) you will need 300 watts!