SpeakerTalk

[rx7rotary]

[proffski]

THe lingo is easy, now back to those 105s...
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill

[audiolabtower]

[SaSi]

I'm currently driving my pair using a Technics SE-9200 power amp, rated at around 70 W per channel. I listen to them in a medium - small room and the sound output seems to nicely fill the room with plenty of headroom. Even at an average of 10W on average, they sound loud enough.

These are rated at 200W so a more powerful amp would provide more headroom than a 70W amp, if only by a few dB.

When I overcome my laziness, I have plans to drive them using a pair of bridged SE-9060 amps that would provide 180W/ch. I think that should be plenty enough.

I haven't cleaned the fuseholders and the banana plugs to the heads need some cleaning also. And I haven't recapped the crossovers. But they still sound awesome as they are.

[audiolabtower]

Let's say the 105 is 86 dB/W at 1 m anechoic.
Room reflections generally accepted to add around 4 dB to the total sound.
So 1W gives now 90 dB in room.
Listening distance 2 m reduces to 84 dB, 4 m (pretty common listening distance) reduces to 78dB with inverse square law.
A second speaker adds 3 dB so now 1 W produces 81 dB in room.

Ten times power to 10 W gives 91 dB in room which is twice as loud.
So 100 W gives 101 dB in room.
Another 3 dB acoustic power in room (a small volume increase of 20%) is double amp power to 200 W for 104 dB.

All approx of course, but gives an idea of peak amp power required.