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#202579 - 03/30/08 11:42 AM Re: A1400-8 [Re: Mojo]
jakeman Offline
aficionado

Registered: 10/03/05
Posts: 852
Loc: Toronto
One of the most elegant stereo systems I have heard recently was at a friends place in January who uses a 5W single ended triode tube amp to drive a pair of high sensitivity (95db/w) Cain & Cain Abby speakers. He listens mainly to classical and jazz and they are very detailed and transparent in his small apartment. The downside was not good deep bass performance below 75hz. Otherwise it sounded very nice for strings and vocals in particular.
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#202617 - 03/30/08 07:34 PM Re: A1400-8 [Re: jakeman]
mapatton Offline
local

Registered: 12/16/07
Posts: 241
Loc: Orlando, FL
Dynamic range over what? My favorable listening is at 92db (at 1 meter). And I would desire more than 6 db dynamic. More like 25db \:\)


Edited by mapatton (03/30/08 07:48 PM)
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Pio 94,SB3,BD30,A35,Pio 48AV.Pronto 7000 controlling all. Getting ready for 22s, 150 & QS8s.

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#203353 - 04/07/08 01:28 AM Re: A1400-8 [Re: jakeman]
Dundas Offline
old hand

Registered: 03/02/08
Posts: 72
Loc: Hamilton
 Originally Posted By: jakeman
Firstly the amp doesn't get hot.


I guess hot is a relative term. The thermometer I have set on top of the amp is reading 43C after running for several hours at low volume on an open (no top no sides) peg board (holes) shelf.

It feels hot to me!

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#203356 - 04/07/08 05:48 AM Re: A1400-8 [Re: Dundas]
EFalardeau Offline
connoisseur

Registered: 08/27/07
Posts: 3270
Loc: Laval, Quebec, Canada
 Originally Posted By: Dundas
I guess hot is a relative term. The thermometer I have set on top of the amp is reading 43C after running for several hours at low volume on an open (no top no sides) peg board (holes) shelf.

It feels hot to me!

Yes hot is relative. And relatives like company!
To complete your post, it would be nice if you ran some comparisons (one at high volume would be nice), but also compare it to the temp of your computer, your DVD player idle/playing and so on...
Thanks in advance.
_________________________
E = MC2 = ((2M80 + VP180 + 4QS8)/(EP800 + EP500))^(ADA1500 x D2v)
Audiobytes! 2M22! 2VP150!

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#203384 - 04/07/08 10:24 AM Re: A1400-8 [Re: Dundas]
jakeman Offline
aficionado

Registered: 10/03/05
Posts: 852
Loc: Toronto
 Originally Posted By: Dundas

I guess hot is a relative term. The thermometer I have set on top of the amp is reading 43C after running for several hours at low volume on an open (no top no sides) peg board (holes) shelf.

It feels hot to me!


Right, like Eric says hot is relative. If you want to compare the meaning of "hot" try the same test with Class A, AB, tube or any other amp. Its the reason why Class D amps are now finding their way into heat sensitive applications such as integrated digital streaming devices or music servers.
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#203410 - 04/07/08 12:57 PM Re: A1400-8 [Re: jakeman]
rmk1 Offline
buff

Registered: 10/02/05
Posts: 46
Loc: Northern Calif
I found the A1400-8 ran warm as well but I did not put a temp guage on it. I am now running a Sunfire TG7400 and it runs noticably cooler (based upon touching the case) during use.

BTW, I returned the A-1400-8. I found the two amps very close in performance but I slightly preferred the sound and flexibility of the Sunfire especially the signal sensing "Auto On" feature. I could never get the 12 Volt trigger feature of the A1400-8 to work with my Integra. As a result was I was leaving the amp on all of the time and it was very warm even at idle. I also use and like the Sunfire's Current/Voltage Source output options for my main speakers.

Again, I liked both amps a lot but I have a history with Sunfire amps and for me the A1400-8 needed to be noticeably better ... and it just wasn't.



Edited by rmk1 (04/07/08 12:58 PM)

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#203413 - 04/07/08 01:21 PM Re: A1400-8 [Re: rmk1]
jakeman Offline
aficionado

Registered: 10/03/05
Posts: 852
Loc: Toronto
Must be a fine amp Rob. What's the purpose of Sunfire's Current/Voltage Source output options?
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John

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#203420 - 04/07/08 02:11 PM Re: A1400-8 [Re: jakeman]
rmk1 Offline
buff

Registered: 10/02/05
Posts: 46
Loc: Northern Calif
 Originally Posted By: jakeman
Must be a fine amp Rob. What's the purpose of Sunfire's Current/Voltage Source output options?


Hi John,

Yes the Sunfire's are nice amps but i don't think you will like the explanation . According to a whitepaper by Bob Carver, you can create a "Tube Amp" sound by increasing the impedance of the speaker outputs "Current Source" (as I recall they use a 1 Ohm resistor). They suggest bi-wiring the speakers with the Current Source to the Tweeter ("warmer sound") and the Voltage Source to the bass/mid drivers.

I have played around with this a bit and currently use the above config with my Revel Studios. The differences are slight but the concept is interesting. It is easily bypassed by running from the Voltage Source outputs only. Here is a link to the Sunfire Whitepaper


Edited by rmk1 (04/07/08 02:25 PM)

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#203422 - 04/07/08 02:15 PM Re: A1400-8 [Re: rmk1]
EFalardeau Offline
connoisseur

Registered: 08/27/07
Posts: 3270
Loc: Laval, Quebec, Canada
I first had trouble with 12V trigger and my Onkyo 805 until I realized that it may not necessarily work with a stereo jack. I switched to mono and it started to work just fine. Were you using a mono or stereo 1/8 cable?
_________________________
E = MC2 = ((2M80 + VP180 + 4QS8)/(EP800 + EP500))^(ADA1500 x D2v)
Audiobytes! 2M22! 2VP150!

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#203424 - 04/07/08 02:22 PM Re: A1400-8 [Re: EFalardeau]
rmk1 Offline
buff

Registered: 10/02/05
Posts: 46
Loc: Northern Calif
 Originally Posted By: EFalardeau
I first had trouble with 12V trigger and my Onkyo 805 until I realized that it may not necessarily work with a stereo jack. I switched to mono and it started to work just fine. Were you using a mono or stereo 1/8 cable?


Yes, I tried two different mono 1/8" cables and double checked the settings in the Integra. No response on the A1400-8 side . I have not tried this feature with the Sunfire (even though it has it) as I prefer the signal sensing "Auto On" feature. Works great and one less cable to mess with.

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