 Re: Audioholics A1400-8 Review
|
Joined: Feb 2008
Posts: 1,005
connoisseur
|
connoisseur
Joined: Feb 2008
Posts: 1,005 |
Axiom stepped up to the plate and sent Mel a new one and I am covering the repair of his old one. Sent the old amp in yesterday. Have not heard anything else about the new one.
|
|
|
Re: Audioholics A1400-8 Review
|
Joined: Mar 2002
Posts: 3,749 Likes: 37
connoisseur
|
connoisseur
Joined: Mar 2002
Posts: 3,749 Likes: 37 |
So, Mr. Lofft, you mean putting a fuse in the circuit will impair the sound quality? Maybe you should try one of those gold plated audiophile fuses. JohnK, if putting a fuse in the circuit path will have a deletrious effect on sound quality, think of all the other circuit choices which might also effect SQ. Peter,
To the extent that protection circuitry often includes some type of current limiting that reduces the output power the amplifier will produce, and hence cause it to go into clipping much sooner than would otherwise occur, then yes, amplifiers can indeed sound different.
I'm often misquoted regarding statements I've made about the "sound" of amplifiers, both here in the forums and in various magazine articles over the years. There are numerous reasons why amplifiers may sound different, especially when they are driven to their output limits. However, to reiterate, when solid-state amplifiers have ruler-flat frequency response (most do), distortion levels below, say, 0.2%, and are free from design errors that may compromise one or more aspects of performance (e.g. many early solid-state designs, mostly Japanese, used huge amounts of negative feedback to reduce THD distortion to 0.0002% or less), and when they are not driven at or near the limits of their output capabilities, they will tend to sound identical. At least, that is my experience participating in double-blind comparisons of a variety of different solid-state amplifiers. I certainly have not heard every amplifier, and would be reluctant to generalize to newer designs that were never part of the tests I participated in.
Just in passing, I'll comment that swapping cables trying to detect the nuances of amplifier sound differences takes too much time. Ideally, the switching should be instantaneous with relay-operated switching, or certainly take no longer than about 3 seconds, and of course it should be done blind.
Regards,
Alan
Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.
|
|
|
Re: Audioholics A1400-8 Review
|
Joined: Oct 2005
Posts: 853
aficionado
|
|
aficionado
Joined: Oct 2005
Posts: 853 |
So, Mr. Lofft, you mean putting a fuse in the circuit will impair the sound quality? Maybe you should try one of those gold plated audiophile fuses.
JohnK, if putting a fuse in the circuit path will have a deletrious effect on sound quality, think of all the other circuit choices which might also effect SQ.
I doubt he is referring to a fuse in the circuit. I believe its more like the power limiting circuit which causes an amp to clip when it reaches a certain temperature. Its a conventional way to protect the amp but it really screws up amp performance and hurts sound quality when the circuit kicks in and the amp starts clipping. One design goal which the folks at Axiom have always said is that their amps won't clip. I've tried clipping the A-1400-8 and lately the A-1400-2 and can't do it. That also puts an onus on the user not to abuse the amp or do dumb stuff. Any audio component can be abused and get fried if the user doesn't take care. I've blown enough drivers, receivers, projectors and processors to know better so I'm ultra careful these days.
John
|
|
|
Re: Audioholics A1400-8 Review
|
Joined: May 2002
Posts: 10,654
shareholder in the making
|
|
shareholder in the making
Joined: May 2002
Posts: 10,654 |
2x6, you totally misinterpreted Alan's comment. The provision in receivers to set a lower impedance rating(to help prevent overheating and keep the UL happy)limits the voltage that the power supply section of the amplifier can output. Pursuant to Ohm's Law, when the voltage is limited, so is the current and power. The result is to cut the maximum power capability roughly in half, as lab tests have shown, therefore making clipping more likely. It's been consistently suggested here that the lower impedance setting never be used, despite the direction in the manual.
-----------------------------------
Enjoy the music, not the equipment.
|
|
|
Re: Audioholics A1400-8 Review
|
Joined: Aug 2004
Posts: 6,379 Likes: 7
axiomite
|
|
axiomite
Joined: Aug 2004
Posts: 6,379 Likes: 7 |
Those gold-plated fuses seem more attractive every day 
Last edited by bridgman; 04/16/09 02:34 AM.
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
|
|
|
Re: Audioholics A1400-8 Review
|
Joined: Apr 2003
Posts: 16,441
shareholder in the making
|
|
shareholder in the making
Joined: Apr 2003
Posts: 16,441 |
I'm getting the strongest feeling of déjà vu I've had in a while. I wonder what it could be? 2x6, you totally misinterpreted Alan's comment. Yeah, that's it.
|
|
|
Re: Audioholics A1400-8 Review
|
Joined: Feb 2009
Posts: 562
aficionado
|
|
aficionado
Joined: Feb 2009
Posts: 562 |
"What we've got here is failure to communicate. Some men you just can't reach, so you get what we had here last week which is the way he wants it. Well, he gets it. And I don't like it any more than you men." (Captain in Cool Hand Luke  ) I thought the original question was why couldn't circuit protection, due to shorting wires be included. I'm no EE, but that's what fuses are for. Maybe they don't work for this application as presented. But why is the subject changed? The protection circuit against over driving (or what ever it is called), seems an entirely different thing. Maybe I am missing something, but I believe Peter meant protect from frying from (Jay ;o) crossing wires on the back of the amp, not frying from maximum usage.
Last edited by davekro; 04/16/09 04:45 AM.
Dave
"In theory, practice and theory are the same. In practice they're not."
|
|
|
Re: Audioholics A1400-8 Review
|
Joined: Dec 2008
Posts: 1,361
connoisseur
|
|
connoisseur
Joined: Dec 2008
Posts: 1,361 |
I've tried clipping the A-1400-8 and lately the A-1400-2 and can't do it. Please tell me you are not running a 1400-8 and a 1400-2 in one system. Let me guess, Bose Lifestyle 1400 speakers? Seems like the logical choice.
Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire
|
|
|
Re: Audioholics A1400-8 Review
|
Joined: Oct 2005
Posts: 853
aficionado
|
|
aficionado
Joined: Oct 2005
Posts: 853 |
Nope. I'm running the A1400-2 in my stereo rig. It replaced a Bryston 4BSST I had used for years. Reason: it sounds better as in effortless mids and highs and more detailed bass transients. Also when comparing the 2 amps a couple of months ago a friend of mine brought over his power hogging AAD 7001 professional studio monitors which clipped my Bryston playing The Sheffield Test Drum track. No such problem with the A1400-2.  http://mixonline.com/gear/reviews/audio_american_acoustic_development/
John
|
|
|
Re: Audioholics A1400-8 Review
|
Joined: Dec 2003
Posts: 10,420
shareholder in the making
|
|
shareholder in the making
Joined: Dec 2003
Posts: 10,420 |
Sure, thanks alot John, give me a reason to WANT the A1400-2, now that I finally have reasoned the A1400-8 into my system someday.
Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70
|
|
|
|
Forums16
Topics24,946
Posts442,492
Members15,617
| |
Most Online2,082
Jan 22nd, 2020
|
|
|
0 members (),
1,258
guests, and
1
robot. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
|
