Does 4x40W enough for a 15m2 room?

[Dxvideo]

Hello all,

I made a 2.1 in last weekend. I used 4xTDA2052 (standard application circuit on ST's manual+passive crossover circuits) with 2x22v (250VA) PSU and 2 x 4ohm subwoofer + 2 x 4 ohm satellite speaker box then plugged it in to my pc's line out. And no hum, no noise and no on/off plops... Until that its all normal, but I feel it doesn't give 40W output level! Because generally my volume pot is on maximum level!

Question;
-Am I mad or deaf?
-4 TDA2052s dont give 40W x 4?
-160W doesnt enough for a 15m2 room?

* They (SGS Thomson) say TDA2052 gives 48W to 4ohm with +/-23v PSU...

[peranders]

> 10 W with normal speakers will get your neighbours

..... but 4000 watts want some people in their cars..... 3-4 sqr meters....

[Dxvideo]

I gues I am a "normal" human. And no neighbor knocked my door until now! I think my amplifiers are some poor! Whats the problem do you think?

[sangram]

You have deaf neighbours, haha.

No but 40 watts means nothing. You have to know what the total output is, in terms of speaker sensitivity. 40 watts into cheap 85 dB speakers will not sound loud enough. 5 watts into a 94 dB+ speaker will be deafeningly loud.

I have built a project with 35 watt bridged TDA 2030, into 90dB Jamo E470, and could not listen more than halfway loud (Linear volume pot, not lawfaked) at any time.

[Circlotron]

With your fingers in your ears first, get someone else to turn the volume right up. Is there any distortion? If it still sounds clean then your system does not have enough voltage gain.

50+50 watts into ~87dB/W speakers in my 3x7 metre loungeroom is way, way loud enough to drive my ears well into their non-linear region.

[Circlotron]

Originally posted by sangram
40 watts into cheap 85 dB speakers will not sound loud enough. 5 watts into a 94 dB+ speaker will be deafeningly loud.

Not where I come from it wouldn't.
The second speaker would have a SPL of 99.2910293% of the first.

[elizard]

Originally posted by Circlotron

Not where I come from it wouldn't.
The second speaker would have a SPL of 99.2910293% of the first.

HAHA .. oo, ouch

But yeah, both cases would produce slightly over 100dB (of course, at 1 metre length!)

[darkm4n]

In my 5x4 room i have about 2800 W RMS at aprox 98 dB
I attached a picture of my system .
The aspect of the speaker's is not so good .. i didn't want some fancy looging speaker's ... i just want a good sound ...

Notice the klevar speaker's ( yellow ) and the bass horn's ( standing on the subwoofer's , next to the speaker's with yellow driver )

[sangram]

Originally posted by Circlotron

Not where I come from it wouldn't.
The second speaker would have a SPL of 99.2910293% of the first.

Maybe I put an extra zero into the calculator

That was a figure of speech, so OK, 10 watts into 94 dB would be a lot louder than 40 watts into 85 dB speakers...

[Dxvideo]

I never need to plug my fingers to my ear! And I do not hear any distortion at full volume with my 2.1! My subwoofers are 2 x 16cm 4ohm WESTRA (I dont know they are good or bad brand but I am sure that they are enoughly soft!). But with my old amplifiers (2xLM1876 4 x 22W distorted) my system was (with same speakers) louder than now!

Can you comment now?