[beppe61]

I have a kind question.
I have been offered a old 2B power amp.
I have a pair of Dynaudio speakers, quite demanding as a load.
I wonder if the 2B could give a deep, big and powerful bass or it would be better to look at something more powerful (i.e. 3B).
My room is 4,5x6m and I listen at about 2,5 m from the speakers.
A friend advised me to look at max peak current more than at power.
What is this peak current ? Where can I find it in a datasheet?
Can it give a measure of the driving ability of an amp?

Thank you very much indeed.

Kind regards,

beppe61

[James Tanner]

Hi beepe

 
   The 2B LP amp.  has 25 Amperes of peak current available per channel the 3B - 36 amps peak, and controls the bass with a 500+ damping factor the same as any of the larger Bryston amplifiers.
 
james

[beppe61]

Hi beepe
 
The 2B LP amp.  has 25 Amperes of peak current available per channel the 3B - 36 amps peak, and controls the bass with a 500+ damping factor the same as any of the larger Bryston amplifiers.
 
james

Dear Mr. Tanner,

thank you sincerely for your extremely kind and valuable reply.
And congratulations for your exceptional products.
Very remarkable figures indeed for both amps.
Do you think that this data of the peak current available is the best to describe the driving ability of a power amp ?
I know that the test conditions (resistive load) are different from the real case (speakers), but maybe a relation can be established.

Thank you so much again for your kind and helpful support.
Kind regards,

beppe61

[James Tanner]

Hi beepe


The peak current in my opinion is not the issue - many power supply designs can be implimented which give good instantanious peak current but 'steady state' current suffers and the power supply 'bounces' around based on signal.

Our designs are very 'stiff constant power supplies'.

I have found over the years that a power amplifiers ability to control the 'transient' nature of music (stopping and starting the drivers) is the most important consideration. Real world speakers require both 'voltage' and 'current' at any given frequency and the amps ability to deliver the voltage and current instantaniously is critical in maintaining the control on the transients in all music signals.

james

[gaderson]

I have been offered a old 2B power amp.
I have a pair of Dynaudio speakers, quite demanding as a load.

beppe61

Is this a 4 Ohm speaker?  I hava a pair of their BM15 studio monitors, and I first used a couple channels from my 9B-ST (125W/ch), and I didn't really get a good sound until I had picked up a 4B-ST-Pro.  With the full 250W/ch of the 4B, things got much better, it was much cleaner--think the 9B was laboring somewhat with the lack of power.  Headroom is good.

[beppe61]

Hi beepe
The peak current in my opinion is not the issue - many power supply designs can be implimented which give good instantanious peak current but 'steady state' current suffers and the power supply 'bounces' around based on signal.
Our designs are very 'stiff constant power supplies'.
I have found over the years that a power amplifiers ability to control the 'transient' nature of music (stopping and starting the drivers) is the most important consideration. Real world speakers require both  ...

Dear Mr. Tanner,
thank you so much for your kind and very valuable explanation.
Kind regards,

beppe61

[beppe61]

Is this a 4 Ohm speaker?  I hava a pair of their BM15 studio monitors, and I first used a couple channels from my 9B-ST (125W/ch), and I didn't really get a good sound until I had picked up a 4B-ST-Pro.  With the full 250W/ch of the 4B, things got much better, it was much cleaner--think the 9B was laboring somewhat with the lack of power.  Headroom is good.[/quote]

Dear Sir,

I think that my situation is very similar to yours.
So a very powerful amp is needed. And consequently expensive as well.
Anyway I cannot understand why Dynaudio woofers are so difficult to drive adequately.
With a "normal" amp they just mumble.

Thank you very much.
Kind regards,

beppe61