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#375570 - 05/08/12 10:51 PM Re: Axiom Amplifiers: The Next Generation [Re: Ken.C]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 156
Originally Posted By: Ken.C
So one does wonder, then, how this would relate to the A1400-8's maximum single channel output power.


The same math applies to the A1400. I believe that the single channel continuous power rating of the A1400 was specified at 350 watts into 8 ohms.

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#375572 - 05/08/12 11:18 PM Re: Axiom Amplifiers: The Next Generation [Re: Ian]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17695
Loc: NoVA
OK, I couldn't remember the numbers.

Indeed after doing a little digging on the website (you guys don't take stuff down, do you?), it is indeed quoted at 350WPC into 8 ohms 1 channel driven.


Edited by Ken.C (05/08/12 11:19 PM)
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#375583 - 05/09/12 12:35 AM Re: Axiom Amplifiers: The Next Generation [Re: Andrew]
dakkon Offline
connoisseur

Registered: 02/08/04
Posts: 1806
Originally Posted By: Andrew

In the A1500 we are running +/-85Vdc rails


Does the rail voltage remain constant regardless of load impedance?


I am under the impression, that amps which have power ratings that do not double as load impedance halves varies their rail voltage...If the rail voltage is held constant, then as the impedance halves the power output should double, infinitely in a theoretical situation.

Going off of Ians' chart the rail voltage that Andrew provided, the rail voltage remains constant until there are 3 channels driven at 100%, at which time the rail voltage reduces when a 4ohm load is present. At 3 channels driven @100%, the rail voltage should reduce to approximately 46Vrms or 77% of 60.095 Vrms. the 77% reduction in voltage is representative of the difference between 650W and 500W.

Do i have a correct conceptual understanding of how this works?

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#375588 - 05/09/12 02:28 AM Re: Axiom Amplifiers: The Next Generation [Re: Andrew]
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11053
Loc: Richland, WA, USA
Originally Posted By: Andrew
Technology races on and there are new and far more sophisticated devices available today that were unheard of 6 years ago, and these are incorporated into all of the new amplifiers.


I'm curious to read more on what this statement entails, and what it means for real-world performance.
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#375595 - 05/09/12 06:52 AM Re: Axiom Amplifiers: The Next Generation [Re: dakkon]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 156
Originally Posted By: dakkon
Originally Posted By: Andrew

In the A1500 we are running +/-85Vdc rails


Does the rail voltage remain constant regardless of load impedance?


I am under the impression, that amps which have power ratings that do not double as load impedance halves varies their rail voltage...If the rail voltage is held constant, then as the impedance halves the power output should double, infinitely in a theoretical situation.

Going off of Ians' chart the rail voltage that Andrew provided, the rail voltage remains constant until there are 3 channels driven at 100%, at which time the rail voltage reduces when a 4ohm load is present. At 3 channels driven @100%, the rail voltage should reduce to approximately 46Vrms or 77% of 60.095 Vrms. the 77% reduction in voltage is representative of the difference between 650W and 500W.

Do i have a correct conceptual understanding of how this works?



The rail voltage remains constant until we reach the maximum continuous current capability of the power supply, at which time the rail voltage will reduce or "sag". This is why the power output drops at a certain point when more channels are added. At that point the maximum rail voltage is no longer the limiting factor in output power, it's now the supply current and the subsequent drop in rail voltage. If we had an unlimited supply current available, the power output would keep doubling at each halving of the load impedance until we reach the current limits of the amplifier output stage, which has current limiting protection. On the A1500 this will not take place until you're down into sub-2ohm territory.

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#375596 - 05/09/12 07:00 AM Re: Axiom Amplifiers: The Next Generation [Re: CV]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 156
Originally Posted By: CV
Originally Posted By: Andrew
Technology races on and there are new and far more sophisticated devices available today that were unheard of 6 years ago, and these are incorporated into all of the new amplifiers.


I'm curious to read more on what this statement entails, and what it means for real-world performance.


Here's a shortlist of the "big ones":

Lower distortion, particularly at low power outputs where the amplifier spends most of its time operating.

Higher efficiency.

Cooler idling temperature.

Better control of output stage switching = excellent long term reliability.

Extremely robust and instantaneous protection circuitry for major fault conditions.

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#375597 - 05/09/12 07:26 AM Re: Axiom Amplifiers: The Next Generation [Re: Ian]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10666
Loc: Central NH
Andrew, forgive a naive question, but is there such a thing as "speed" of the amp?

Way back when, I went from a NAD 2200PE to a receiver and felt something was missing. I can only describe it as missing some "liveness" that I was perceiving as a lack of transients...drums, cymbals, a "roughly" played and close-miked acoustic guitar.

I'm not sure if there was a "speed" issue, or it was a matter of having huge reserves for those very short attacks(?).

I used to read of damping factors, etc... which I don't see as much info on anymore.

Is there anything to this?
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#375603 - 05/09/12 08:30 AM Re: Axiom Amplifiers: The Next Generation [Re: MarkSJohnson]
J. B. Offline
connoisseur

Registered: 01/19/11
Posts: 1237
Loc: Quebec, Canada
Originally Posted By: MarkSJohnson
Andrew, forgive a naive question, but is there such a thing as "speed" of the amp?

Way back when, I went from a NAD 2200PE to a receiver and felt something was missing. I can only describe it as missing some "liveness" that I was perceiving as a lack of transients...drums, cymbals, a "roughly" played and close-miked acoustic guitar.

I'm not sure if there was a "speed" issue, or it was a matter of having huge reserves for those very short attacks(?).

I used to read of damping factors, etc... which I don't see as much info on anymore.

Is there anything to this?


maybe you're talking about "rise time"...
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#375612 - 05/09/12 09:52 AM Re: Axiom Amplifiers: The Next Generation [Re: Ian]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10666
Loc: Central NH
Can't we keep this thread clean? grin
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::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#375637 - 05/09/12 11:58 AM Re: Axiom Amplifiers: The Next Generation [Re: Ian]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3442
Loc: Western Maryland, USA
It's also known as slew rate, if that's not too dirty for you.
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