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Post by yomanze on May 22, 2018 14:25:56 GMT
The new Parasound Halo JC5 has a massive 90A. However, I think a some midrange and top end purity is lost when you go really high power, probably due to the higher number of power transistors required. I don’t think it is a coincidence that the sweet spot of British hairshirt amps, for example, are between 50W and 100W at 8 Ohms. Part of is this may well to be with much bigger American living rooms though...
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Post by MartinT on May 22, 2018 17:17:28 GMT
I had Jerry's JC1 in my system many years ago, it compared well with my then Chord SPM-1200E.
It sounds like the JC5 is a bit of a beast. It could be, as you suggest, too much of a good thing.
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Post by jandl100 on May 22, 2018 17:39:22 GMT
It was the Halo A21, Martin.
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Post by MartinT on May 22, 2018 18:49:14 GMT
Thanks for the correction, Jerry. It was a while ago!
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tonedeaf
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Oldies are Goldies
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Post by tonedeaf on Jul 24, 2018 11:52:31 GMT
So how do you find out what an amp can deliver as instantaneous current delivery?
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Post by Slinger on Jul 24, 2018 16:46:49 GMT
I find, at my age, specs are very important: I can't read a CD cover without them. Coincidentally, my specs are kept on my head by my ears, which I also use to judge the efficacy of my hi-fi equipment.
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Post by MartinT on Jul 24, 2018 20:17:41 GMT
So how do you find out what an amp can deliver as instantaneous current delivery? Some manufacturers will publish the figures, others will not. Form your own conclusion. |
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Post by Deleted on Aug 4, 2018 9:04:22 GMT
Gents, can you share any gems around damping factor please? I get the theory, but don't know much else about it.
I know the amp you own should be dictated by the speakers you want to drive - or vice verca if you want to get philiosophical; I prefer the first choice I stated. Having said that, is there a minimum number you'd settle for? My Magtech is >600 into an 8 ohm load.
I'm very interested in a certain monoblock pair of amps (Longdog P6) that have a damping factor of 35; this is 'significantly' less (I use inverted commas here because I don't know how much of a difference this really makes). Is this number the whole sotry when it comes to driver control, especially bass drivers?
It doesn't matter for me right now, as I'm using small bookshelves, but as I mentioned, I don't want my amp choice to exclude desirable speakers in future.
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Post by MartinT on Aug 4, 2018 10:04:50 GMT
You can't read a lot into damping factor, to be honest. Instantaneous current is a better measure, as discussed before. It won't tell you anything about transparency or staging or overall SQ.
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Deleted
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Post by Deleted on Aug 20, 2018 20:17:01 GMT
That is odd some folk do, but I have a strange gift I am autistic. And I can see in my head a circuit and the spec of the parts and hear the amp before I build it and most time I am happy with the out come.
OK it give me loads of other problems but it is useful for my new hobby.
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Post by Deleted on Aug 20, 2018 20:23:46 GMT
There isn't much I would look for except maximum instantaneous current ability (not power). Rarely do specs tally with what I hear. But this will also need a time interval spec i.e. 20mS or 100uS. This then can translate to the power supply and the Vsat etc. of the output device plus bits. I like large damping factor but on old designs like Crown for example massive damping factor crap BW and rise times. I find it is all a balance and cost often. Often people forget the rise and fall time, OK fast also effect the way a bass drum sounds not a sinwave but the attacking edges. And often we see amps will poor BW but good timing sound OK and high speed amp sound crap, so fast edges large energy store. |
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Post by MartinT on Aug 20, 2018 20:40:21 GMT
You remind me of the old Hitachi MOSFET application circuit again. Amazing performance specs, crap sound.
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Deleted
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Post by Deleted on Aug 21, 2018 6:53:06 GMT
You remind me of the old Hitachi MOSFET application circuit again. Amazing performance specs, crap sound. Yes it was but with a few changes we got the Claymore, the idiot used the wrong driver transistors. |
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Post by MartinT on Aug 21, 2018 6:59:32 GMT
Happy Birthday, Colin!
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Post by Slinger on Aug 21, 2018 11:09:36 GMT
I second that! Happy Birthday Colin.  |
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Post by Deleted on Aug 21, 2018 14:07:55 GMT
Thanks Guys
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Post by Deleted on Sept 5, 2018 8:30:40 GMT
I tried to resist, I honestly did. But i was weak. Longdog Audio P6 monoblock down payment has been made; I’m excited to test these bad boys out; the thing that I find intriguing is the low count of output devices (one per side). Specs? 200w into 8 ohm and doubles as impedance halves; 50a current delivery, not sure on their speed in this case. Massive overkill for my bookshelves; that’ll be rectified in due time  |
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Post by MartinT on Sept 5, 2018 8:34:21 GMT
Nick designs good kit. I'm sure you'll be happy with them.
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Post by Deleted on Oct 1, 2018 12:51:22 GMT
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Post by julesd68 on Oct 1, 2018 13:22:17 GMT
I think it was these I heard in the Longdog room at a show last year. They were being used with some BBC style speakers by Graham Audio which were definitely not my cuppa so difficult for me to assess ...
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