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#283713 - 12/24/09 04:24 PM Re: EP800s Under Repair Again [Re: ClubNeon]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17775
Loc: NoVA
As I recall from that rather unpleasant A1400 thread awhile back, the 1/4" connector is unbalanced and electrically separate from the balanced input, although they're in the same physical connector.
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#283715 - 12/24/09 04:34 PM Re: EP800s Under Repair Again [Re: ClubNeon]
EFalardeau Offline
connoisseur

Registered: 08/27/07
Posts: 3270
Loc: Laval, Quebec, Canada
"both balanced and unbalanced circuits" means they have two completely independant circuit boards. One takes balanced input, they other takes unbalanced input. They do not cross paths.
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E = MC2 = ((2M80 + VP180 + 4QS8)/(EP800 + EP500))^(ADA1500 x D2v)
Audiobytes! 2M22! 2VP150!

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#283716 - 12/24/09 04:54 PM Re: EP800s Under Repair Again [Re: EFalardeau]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17775
Loc: NoVA
Snerk. Guess I should have read Eric's post more carefully before making my own. He said it better than me...
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I am the Doctor, and THIS... is my SPOON!

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#283717 - 12/24/09 05:15 PM Re: EP800s Under Repair Again [Re: Ken.C]
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11200
Loc: Richland, WA, USA
The only thing you need to read carefully is The Wheel of Time.

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#283718 - 12/24/09 05:16 PM Re: EP800s Under Repair Again [Re: CV]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17775
Loc: NoVA
This is true. I'd better get on it.

Waaah! I don't want to finish!
_________________________
I am the Doctor, and THIS... is my SPOON!

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#283720 - 12/24/09 05:42 PM Re: EP800s Under Repair Again [Re: EFalardeau]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3448
Loc: Western Maryland, USA
 Originally Posted By: EFalardeau
"both balanced and unbalanced circuits" means they have two completely independant circuit boards. One takes balanced input, they other takes unbalanced input. They do not cross paths.

But they have to meet up somewhere (usually at the pre-amp stage) unless it is a completely differential amp with one side doing the push and the other the pull. No one but the esoteric companies does that.
_________________________
Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
Sony PS3, surround backs
-Chris

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#283764 - 12/25/09 01:57 AM Re: EP800s Under Repair Again [Re: ClubNeon]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10388
Yes, the balanced circuitry typically has a sensitivity 6dB less than the unbalanced, so that the voltage coming out of both is about the same, but then they both undergo the same(28dB or so)final amplification stage.
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#283964 - 12/27/09 01:29 PM Re: EP800s Under Repair Again [Re: SRoode]
Ian Offline
President
aficionado

Registered: 03/13/01
Posts: 808
SRoode,

There are a lot of changes from the original EP800 amp to the new one. Really the only thing that is the same is the DSP board. The new amp has one power supply for each woofer and one amp for each voice coil (2 power supplies and 4 amps). The original amp ran everything from one power supply and one amp. This made the original configuration a 1 ohm load to the amp. I think this was pushing it just a bit too low as some of them seemed to blow the fuses or the mosfets or both. They both end up being about the same wattage, which is over 1,000 watts, but the new design gets there with a lot less current draw per amplifier. To put a finer point on this new design there are technically 8 amplifiers running. Though the DSP board will accept either a differential or single ended input it outputs only differential. In each of the 4 amplifiers there are two channels; one channel is the pull and the other the push.

Another change is the move to the dual XLR / ¼ phone input jack. This jack has completely separate pin outs for the XLR and ¼ phone for differential and single ended inputs. The standard RCA connection is achieved with the 90 degree adaptor that goes from RCA to ¼ phone. This is a change that is happening on all of our sub amplifiers because we found the single largest service issue was the breaking of the RCA input. Most likely this was caused by either stepping on the cable or pushing the sub too tight against the wall. First we tried 2 mounting screws on the RCA input but it was not enough. The 90 degree adaptor is the proper solution because the RCA jack is now pointing down. If you step on the cable it will just come unplugged.

We can send you the other amp you need on Wednesday.
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Ian Colquhoun
President & Chief Engineer

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#284007 - 12/27/09 11:09 PM Re: EP800s Under Repair Again [Re: Ian]
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11200
Loc: Richland, WA, USA
Ian, it's nice to hear the reasoning behind the changes.

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#284008 - 12/27/09 11:25 PM Re: EP800s Under Repair Again [Re: CV]
terzaghi Offline
connoisseur

Registered: 04/04/07
Posts: 4848
Loc: Tulsa, Oklahoma
Sounds like a helluva new amp. I want an ep800!
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-David

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