Onkyo Delta Power supply Circuitry. Is it a gimmick?

[superdog]

I just got an 80's more than likely integrated amp A-8047v.It has this Delta Power Supply Circuitry thing emphasized across the front.Is this just a gimmick name or is there something to this?

 

[asoundhound]

i've got an onkyo m-5150 power amp with a delta power supply. while i have no idea what that means, i would assume that the concept is like the class A,B,C, etc. amplifier circuits. probably not a gimmick, just a particular design.

 

[markn2wae]

Better speaker damping than conventional circuits?

Unless I am mistaken (very likely) this is a system that used a 4-wire speaker cable for each channel, 2 thick wires for the drive to the speaker, and 2 smaller wires to bring the "feedback" signal from the speaker back to the amp.

The theory being, if the negative feedback loop of the amp extended all the way to the speaker itself, there would be better control of cone motion and better sound(??).

Mark T.

 

[superdog]

No it is not as you mentioned.Regular speaker connectors.Googling it did not come up with much.The patent and some description of what it is that is beyond me.There were a couple of big Onkyo amps that had it but still don't know what it does..

 

[Chazb11]

AK has a huge number of audiophiles and technicians and no one seems to know what it does....and there is nothing on the web about it...:scratch2: I'm thinkin' gimmick. It certainly wasn't anything groundbreaking.

 

[Marantz 500]

I think what Mark described is the "Sigma Drive" circuitry used by Kenwood in their Basic M2 amplifier, for example.

 

[CUlater]

Mark was describing Sigma Drive.

Going on nothing more than my engineering edukashun, I'm guessing that its a variant of the old Hitachi Class G circuitry. I'm guessing that the delta part is a variable supply rail scheme that tracks the music signal to always keep the supply rail high enough for high power output, but during low or idle signal conditions minimize power supply draw. YMMV.

 

[riverrat]

Perhaps the term originated HERE.

 

[dshoaf]

No it is not as you mentioned.Regular speaker connectors.Googling it did not come up with much.The patent and some description of what it is that is beyond me.There were a couple of big Onkyo amps that had it but still don't know what it does..

Post a link to the patent or, better yet, if someone has a schematic of the model in question, post it and there are some of us who will decipher it.

There has been _lots_ of marketing blather generated over the decades. Clearly this is right in there....

Cheers,

David

 

[ZeroJunk]

It may just be the name they used for a switching power supply.

 

[shocley]

There's a knowledgable guy in Audio Asylum who thinks very highly of Onkyo amps with the delta power supply circuitry.

Sounds almost like something related to 3 phase circuits - delta vs. wye - that I've never gotten off my lazy butt and understood.

 

[superdog]

Thank you everyone for your response.The amp is a very good sounding amp.Paired with some small pinnacle+6 it has the sound one would expect from the higher powered 70's amps."Uncanny clarity and richness" not commonly associated with mid-80s gear is a apt description.I am not electronically knowledgeable to decipher the electrical jargon associated with it.

 

[Glen B]

The Onkyo Asia and Oceania website has some information on WRAT but nothing on Delta Power Supply.

 

[joshvs]

A and B question

I purchased this amp last week and when I push A and B speaker buttons only B speakers have sound. Normal? Other wise sounds good.

 

[saea501]

Here is a really excellent job of shoveling the audio BS with a BIG shovel. Except here they refer to it as the "delta turbo power source" . Now turbo charged for your convenience.

http://audio-database.com/ONKYO/amp/integraa-820gtr-e.html

 

[whoaru99]

A gimmick? Probably not.

A fancy-pants marketing name for a fairly mundate twist on typical power supply technology? Probably.

 

[SolderIron]

>convenience. http://audio-database.com/ONKYO/amp/...-820gtr-e.html

Reads like their power supply is running above 60 hz line freq. Maybe a switching power supply? need to see the circuit.

 

[js1138]

http://www.beis.de/Elektronik/DeltaSigma/DeltaSigma.html
????????

 

[elcoholic]

Whew that was close. I had to look up the Grand Integra M-510 to see if there was an Delta jargon in the product description. I'm most pleased to report there is no Delta jargon mentioned and my unabashed lust for the 1 kW, 63 kg, M-510 remains fully engorged.

 

[SolderIron]

>http://www.beis.de/Elektronik/DeltaS...eltaSigma.html
????????

I see. A switching power supply then remove the switching frequency...they call it Class D...