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Old 3rd April 2013, 05:42 PM   #1
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Default Not enough power from my amplifier?

Hi chaps,
a quick technical one:

I bought a pair of celestion ditton 332, connected them to my NAD 3130 but the sound is very flat, almost no bass in low volume.
When I press the loudness button on my amp the speakers get alive and sound as they should be.

Does that means my amp is not capable to drive properly the dittons?
Not enough current for 10" woofer, 5" midrange, 3" tweeter, 8 Ohms impedance (can't find their sensitivity) ?

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Old 3rd April 2013, 05:58 PM   #2
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Quote:
Originally Posted by misfits73 View Post
When I press the loudness button on my amp the speakers get alive and sound as they should be.
You just answered your own question right here.

Quote:
a quick technical one:
You have not asked a techical question.
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Old 3rd April 2013, 05:58 PM   #3
lineup is offline lineup  Sweden
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that is what LOUDNESS is for
to give more bass and better sound at Low Volume
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Old 3rd April 2013, 05:59 PM   #4
Mooly is offline Mooly  United Kingdom
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That's not a lack of power because switching in the loudness actually increases the voltage drive to the speakers.

It sounds more like a characteristic of the speakers tbh.

Easiest solution is to try another amp.

To prove it definitively requires a scope (or suitable DVM) and some test tones on CD at known level and different frequencies or better still a frequency sweep (easy to make such a CDR with Audacity). Then just check the output of the amp is constant at all frequencies.
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Old 3rd April 2013, 06:04 PM   #5
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Google

Effieiency 2.8 watts for 90 dB output- not very efficient.

List price $900 in 1980 There's a sucker born every minute.
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Old 3rd April 2013, 06:06 PM   #6
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Originally Posted by Mooly View Post
Easiest solution is to try another amp.

Why do you think another amp will address this issue?
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Old 3rd April 2013, 06:17 PM   #7
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Originally Posted by Fast Eddie D View Post
Google

Effieiency 2.8 watts for 90 dB output- not very efficient.

List price $900 in 1980 There's a sucker born every minute.
Connected them to my AV receiver, Marantz NR1602 in direct mode, sound better imho.

I was confused about that 2.8W at 90db, how much is really?

Shall I consider them scrap already?lol
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Old 3rd April 2013, 06:19 PM   #8
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The technical part was if the loudness increases current or voltage
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Old 3rd April 2013, 06:28 PM   #9
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Originally Posted by misfits73 View Post
The technical part was if the loudness increases current or voltage

That is not what you asked. But the answer to that question is it increases both current and voltage requirements. If your "loudness" control provides 4 dB of bass boost, this in effect reduces the efficiency of your speakers to around 86 dB with 2.8 watts input, or around 82 dB/ watt. This means that with your "loudness" button on you would require about 60 watts to drive the speaker to 100 dB with zero headroom. (This is for one speaker; add 3 dB and double power for 2.)

So a ball park figure is that a 60 watt/channel amplifier would produce 103 dB SPL with zero headroom. I hope this helps.

Last edited by Fast Eddie D; 3rd April 2013 at 06:34 PM.
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Old 3rd April 2013, 06:32 PM   #10
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Originally Posted by misfits73 View Post
Shall I consider them scrap already?lol
No, you just have to understand what you have.

In my experience, low efficiency speakers exhibit significant dynamic compression. There are always exceptions. I am not familiar with this particular speaker, but apparently it is somewhat popular so it may have merit.

My ballpark figures above do not take into account this dynamic compression, which may be as little as 2-3 dB (excellent) to 7-10 dB (poor).
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