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In Reply to: RE: Disagree about Parasound. The John Curl designed Halo A21 is excellent. posted by Opus 33 1/3 on May 11, 2015 at 18:27:10
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Sure think the basic circuit of quite a few Adcom amps - including the 555, 555II, and 5500 are pretty darn decent.
You make me wonder.
Curl and Pass are in (were in, perhaps) roughly the same position with Parasound and Adcom.
Now, I really wonder how much influence they had over the final product. While the Adcom 555 got great reviews, in retrospect it was not as refined, perhaps as it could have been.
I think the Parasound Halo stuff overall gets better reviews, with the fairly expensive JC-1 monos being reference amps for some of the bigtime users.
so while Curl and Pass did the design, were they responsible for Voicing or final parts selection?
Too much is never enough
I copied this from DIYAudio a long time ago... And yes, I think Pass is very cool, with a great ear for music. I have a Pass preamp and I'm praying for synergy.
Exactly. Curl and Pass may produce outstanding designs but those brands have to choose parts to a price point and some of it isn't exactly top shelf. That was my experience with some Adcom gear.
Edits: 05/12/15
Price point covers a LOT of ground. Casework / packaging all the way to selection of individual components.
Lifetime of those parts matters, too. I can't imagine a resistor failure under normal circumstances, but power device (output transistors) will be rated in MTBF. There are only SoMany manufacturers of these devices, too. So a design may have a certain transistor which can be sourced from 3 or 4 builders. All have similar specs including MTBF and are considered 'interchangeable'. Buy the cheapest? Most expensive? Listen to 'em and buy THAT one? How do you control which is used if/when the amp is repaired?
I think money can be saved on circuit board material, too. I've seen and tried to repair boards made from what looked like plastic coated compressed cardboard. It'd char and than conduct.
This as opposed to a good glass epoxy board or one made of G-10.
I love to see the actual cost based on 'cheapest' stuff and 'costliest' and what effect that would have on final consumer cost.
I've argued in the past that even IF Emo made an amp from the SAME schematic as a Bryston, that it wouldn't be even CLOSE to the same, but as far as sound only goes, I'm not too sure any more. As for how long it'll last? You are buying down QUITE the warranty with Bryston, and they DO go to lengths to insure good stuff leaving the factory. It all 'adds up', as they say.
Too much is never enough
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