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Old 18th April 2009, 07:58 PM   #3601
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Stein2,

That looks like an Audiostatic?

I have a friend that runs his Audiostatic panels just fine on a very strong 35w/ch tube amp, and in his room which is likely something on the order of 14 x 14 roughly speaking it is more than loud enough.

If you need more voltage swing, you can bridge a pair. So build the pair you are building now, and if you need 4x the output power, then you can build another pair and bridge them?

Fwiw, I doubt that you will get anything like 98-100db sensitivity from your bass line source. You will get some power handling though. And a bit depends on the wiring scheme as to what you will end up with - if it is a 2 ohm load (for example), then you will gain some apparent output from the amp sinking more current (assuming the amp can do this). Also, I would not count on the manufacturer's SPL rating, they are usually taken at midband, not at LF... measure it urself and see.

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Old 18th April 2009, 08:11 PM   #3602
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Quote:
Originally posted by bear
Stein2,

That looks like an Audiostatic?
Not Audiostatic, made by a local builder who has still a long way to go before he becomes a respected name in international terms, or just might get lucky ... or not...
These run easily if matched up with a Quad405 (but then, 405 was designed for that sort of load) and it remains to be tested when all of the four F5 channels are finished. Then I'll see what's next...
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Old 18th April 2009, 09:29 PM   #3603
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Something scratches my head.

Let us have three amps, one big, one medium, one small.

config 1: big for basses, medium for mediums, small for highs. This works say not too bad.

config 2: swap big and small amps (big for highs, small for basses) this does not works. Basses do not accept a small amp.

So what?
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Old 18th April 2009, 10:49 PM   #3604
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Quote:
Originally posted by bobodioulasso

So what?

I'm with you.
They should have had to bring their consideration of the peak acoustic powers of instruments and voices into their thoughts, too. Each instrument or voice has difference. For example, if we compare peak acoustic power Watts/ sound power level (SPL) dB, it is as follows:
  • Pipe Organ: 12.6 W/ 131dB
  • Bass drum: 10 W/ 130dB
  • Trombone: 6.5 W/ 127dB
  • Singers: 2 W/ 123dB
  • Grand piano: 0.45 W/ 116dB
  • Trumpet: 0.33 W/ 115dB
  • Double bass: 0.16 W/ 112dB
  • Piccolo: 0.08 W/ 109dB
  • Flute: 0.05W/ 107dB
  • Triangle: 0.05W/ 107dB
    . . .
    . . .


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Old 18th April 2009, 11:05 PM   #3605
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Quote:
Originally posted by stein2


Not Audiostatic, made by a local builder who has still a long way to go before he becomes a respected name in international terms, or just might get lucky ... or not...
These run easily if matched up with a Quad405 (but then, 405 was designed for that sort of load) and it remains to be tested when all of the four F5 channels are finished. Then I'll see what's next...

kwayzee triker ;

these quad405 you heard with these panels were made accordingly to stock schematic , even with eeny weeny ECC83 as substitute for input OP;

there is no 100W/channel even in wildest dreams ....... yup for true 8ohms , but everything bellow 8ohms is just triggering 405's internal current limiting , way bellow 100W

Aleph 5 will make these panels bleed , if you're deaf enough .....

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Old 19th April 2009, 12:11 AM   #3606
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Quote:
I'm with you.
Thanks Babowana, glad to see i am not alone!
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Old 19th April 2009, 04:58 AM   #3607
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Quote:
Originally posted by Babowana



I'm with you.
They should have had to bring their consideration of the peak acoustic powers of instruments and voices into their thoughts, too. Each instrument or voice has difference. For example, if we compare peak acoustic power Watts/ sound power level (SPL) dB, it is as follows:
  • Pipe Organ: 12.6 W/ 131dB
  • Bass drum: 10 W/ 130dB
  • Trombone: 6.5 W/ 127dB
  • Singers: 2 W/ 123dB
  • Grand piano: 0.45 W/ 116dB
  • Trumpet: 0.33 W/ 115dB
  • Double bass: 0.16 W/ 112dB
  • Piccolo: 0.08 W/ 109dB
  • Flute: 0.05W/ 107dB
  • Triangle: 0.05W/ 107dB
    . . .
    . . .

><
This is slightly misleading since one usually does not stand in the loft with the pipes, and the organ is played in a very large room where you the listener is a considerable distance away... I also am pretty darn sure that a flute can do more than 107dB (assuming these are 1M measurements?) when played to do that.

Almost no one has a home hi-fi system that can even produce one (1) acoustic watt...

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Old 19th April 2009, 05:33 AM   #3608
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Quote:
Originally posted by bear

This is slightly misleading ...

... a flute can do more than 107dB (assuming these are 1M measurements?) ...


Could be . . . Anyhow, the point is why the smaller amp is acceptable for high part in bi-amping.

Yes, watts/sq.M, and dB is re 1 pico-watt/sq.M.


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Old 19th April 2009, 11:58 AM   #3609
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Quote:
Originally posted by bear


This is slightly misleading since one usually does not stand in the loft with the pipes, and the organ is played in a very large room where you the listener is a considerable distance away... I also am pretty darn sure that a flute can do more than 107dB (assuming these are 1M measurements?) when played to do that.

Almost no one has a home hi-fi system that can even produce one (1) acoustic watt...

_-_-bear
It's power * bandwidth

Guys are getting a tad OT.
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Old 19th April 2009, 03:17 PM   #3610
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"It"?? It is what?

Perhaps a more complete statement would be in order?

The reason that a smaller amp is acceptable, in many instances, is twofold:
- the tweeter tends to have a higher sensitivity (worth 3-6dB or more)
- If you FFT (for example) a CD track and look at the levels, you'll see that there is less level at HF, so less power might be acceptable.

But, I'd go with the general gist of the earlier comment on having all the drivers capable of similar output levels - or put another way, all capable of exceeding some threshold that is appropriate to the situation. (the same threshold criteria would not apply to a speaker in a 10x10ft or M room as would one that was for a 75x75ft room)

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