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#48457 - 03/25/02 12:30 PM Re: anybody know the transformer size?
charlie Offline
Desperado

Registered: 01/14/02
Posts: 1176
Quote:
Originally posted by Azistoohot:
The problem isn't that the amp won't sound good or won't be satisfactory, ....

For me, when a company makes a statement that I know is not true, I lose some faith in the company. Is it a big deal? Not really, but it does make me wonder.


Yep. I suspect that rather than a deliberate effort at deception this is a case of a simple mistake, and as you say I don't really see that it's significant from a practical viewpoint, although it does IMO need to be clairified and/or corrected.

In HTF there is a quote where what appears to be one of the Outlaw engineers kinda seems to denigrate this thread or one like it, calling the participants 'armchair engineers'. I find this a bit disturbing when all we're basicly pointing out is that perpetual motion is, in fact, still unattainable.


Charlie


[Fixed a typo]


[This message has been edited by charlie (edited March 25, 2002).]
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#48458 - 03/25/02 01:39 PM Re: anybody know the transformer size?
Matthew Hill Offline
Desperado

Registered: 11/29/01
Posts: 1434
Loc: Mount Laurel, NJ
I noticed that in the manual, the maximum draw is indicated to be the same, 1800 watts, for both the 755 and 770. Interesting...

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Matthew J. Hill
matt@idsi.net
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#48459 - 03/25/02 03:18 PM Re: anybody know the transformer size?
morphsci Offline
Gunslinger

Registered: 02/15/02
Posts: 243
Loc: Charleston, IL, USA
Guys, this phenomena is not limited to the Outlaw amps. The Rotel RMB-1095 is rated at 5 X 330 W @ 4 Ohms. It is listed as 1600 W max. power consumption (1200 W on net but that is a misprint). It seems unlikely that Outlaw would get into trouble over this from anybody since it seems to be common practice.

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#48460 - 03/25/02 04:16 PM Re: anybody know the transformer size?
charlie Offline
Desperado

Registered: 01/14/02
Posts: 1176
I tried that one once too - "But dad, everyones doing it...."

Didn't work for me.

I suspect the original poster was laboring under a misconception that somehow the VA of the amp was of concern, and we've pretty much strayed way off that line of thinking.

The 770 looks good, I just hate to see something this unimportant get all blown out of proportion. Better to fix it and move on.


Charlie
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#48461 - 03/25/02 04:25 PM Re: anybody know the transformer size?
Azistoohot Offline
Gunslinger

Registered: 02/06/02
Posts: 47
Charlie, is HTF hometheaterforum? I'll take on the Outlaw engineers! This is simple math -- you only need the equation V=IR or P=VI. You don't even need to know the efficiency of the amplifier or anything at all about the design of the amplifier.

I do know that many companies also follow this practice, but it's still not right.

I also know that power doesn't equate to sound quality -- my Creek 30watt per channel sounds better than my 100+ watt per channel Onkyo (in two channel mode), even though the Creek isn't supposed to drive 4 ohm speakers. I have no doubt that this amp sounds pretty good, especially for the price range. I just would like some realistic specs, because people who don't know anything are going to say "the outlaw amp is better because it's rate to produce 300 watts into 7 channels," when the amp can't do this (continuous power, driving 4 ohms, that is). We have to wait until someone actually tests it to see what the real specs are. Then, we have to wait until someone tests a competitor.

As long as this amp isn't like some of the receivers that are rated at 100wpc into 5 channels but that only test to 45wpc into 5 channels @ 8ohms.

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#48462 - 03/25/02 04:54 PM Re: anybody know the transformer size?
Matthew Hill Offline
Desperado

Registered: 11/29/01
Posts: 1434
Loc: Mount Laurel, NJ
As someone else has previously pointed out, this rating is probably not with a duty cycle of 100%. I'd have to guess that amplifier power outputs probably have some "standard" duty cycle that they're rated at.

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Matthew J. Hill
matt@idsi.net
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#48463 - 03/25/02 05:28 PM Re: anybody know the transformer size?
charlie Offline
Desperado

Registered: 01/14/02
Posts: 1176
The FTC regulates this. Here is the newest set of amendments I could find. The federal government has this rule for a good reason.

http://www.ftc.gov/os/2000/12/amplifierrulefrn.pdf

Charlie
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#48464 - 03/25/02 06:34 PM Re: anybody know the transformer size?
steves Offline
Desperado

Registered: 06/18/01
Posts: 356
Loc: Oregon
Quote:
Azistoohot said:

With a 120V and 15A circuit, this amp will produce X watts per channel into 4 ohms, all 7 channels driven 20-20kHz." Where X is less than 300 watts.


Outlaw recommends, at a minimum, a 20 amp circuit be provided for these new amplifiers.

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#48465 - 03/25/02 06:52 PM Re: anybody know the transformer size?
charlie Offline
Desperado

Registered: 01/14/02
Posts: 1176
If the unit connects with a plug that is of a design for 15 amp service this would seem to be an issue. A 20 amp plug won't fit into a 15 amp recepticle.


Charlie
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#48466 - 03/25/02 07:30 PM Re: anybody know the transformer size?
steves Offline
Desperado

Registered: 06/18/01
Posts: 356
Loc: Oregon
Quote:
A 20 amp plug won't fit into a 15 amp recepticle.


I'm sorry, but this I don't understand.

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