Yes, this will all be old news to many of you, but wanted to share my relatively recent discovery of pure Class A amplification.
I have been reading about the virtues of using pure Class A power for a fair while, but had always been put off by the low power ratings, extra heat and bigger unit size. A few weeks ago, I finally pulled the plug on a second-hand Pass Labs Aleph 3 to put in my second system. Albeit I have some relatively inefficient speakers in there (Spendor S3/5R2 at 85dB/W/M) I figured it's in a small room and my listening position is quite close, plus it's winter so I could do with the extra warmth, so thought I'd give it a go.
Well, it was a complete revelation. Granted, it was replacing a little budget Class D amp (XTZ Edge A2-300), but even that little thing pumped out 150W into 8 Ohms, so thought the 30W into the inefficient Spendors might still struggle a bit, but it sounds absolutely wonderful (and even inspired me to go out and get some new speakers to replace the S3/5R2's).
Since getting the amp though, I have been meaning to try it in my main system in my living room. I figured this would be a very different kettle of fish, being a much larger room (9m x 2.5m), greater distance from the speakers and driving some bigger (albeit slightly more efficient at 88dB) floor-standers in the shape of my Spendor A7's (yes, I like Spendors!).
Notably, the amp I have been using in that system is also no slouch, a 400W per channel (into 8 Ohms) Nord NC500DM MkII. Yes, it is Class D, but it is a very impressive performer and handles the A7's with aplomb. I had convinced myself that I would need to spend a lot of money to improve on it.
Whilst the Hypex amp excels in clarity/detail (ridiculous specs for THD etc) and also control (the damping factor is through the roof), I must concede, I have been suffering a bit from listening fatigue in that system. Reading around, this is something that many people associate with Class D, but I have also read many reports suggesting that the Hypex/Purifi amps are a bit of a game changer in that regard. In fact, Nord's own marketing headline on the web page is "Class D, with Class A sound".
So anyway, I hooked up the Aleph 3 this morning, expecting things to sound nice with the volume down low playing some jazz, but convinced that things might start to lose grip when I turned it up with a bit of electronic music.
Well blow me down if 30W of pure Class A didn't knock me for 6!!
Having heard it in my second system, I knew it would have the edge in terms of smoothness and musicality, but I have been listening to that thing all day wondering how it's possible that such a low-powered amp could offer so much in the way of power and control. Even the area where I was sure the Nord would have the edge, that being transparency and detail, the Pass Labs highlights just how unnatural and edgy the treble on the Nord is.
Which brings me to the old adage about Watts not all being created equal. A cliche I've heard many times, but only today have I really understood how true that is.
Well, the Aleph 3 has been moved back into my second system and needless to say, all I can think about now is which Class A amp I am going to purchase to replace the Nord in my main system after being completely blown away by it.
So a question to those who use Class A, have I just got lucky with the Aleph 3, or is this what Class A is all about? And then, what to go for (once I've saved up a few quid)?
I've certainly got my eye on the First Watt or newer Pass Labs amps, but also interested in the Colin Wonfer designs being sold under 'EWA' (from ABC Audio). Any others to consider at maybe a maximum price of £3 or £4k?
(I'm planning on SS rather than valves at the minute, but I can always be convinced).
Cheers
I have been reading about the virtues of using pure Class A power for a fair while, but had always been put off by the low power ratings, extra heat and bigger unit size. A few weeks ago, I finally pulled the plug on a second-hand Pass Labs Aleph 3 to put in my second system. Albeit I have some relatively inefficient speakers in there (Spendor S3/5R2 at 85dB/W/M) I figured it's in a small room and my listening position is quite close, plus it's winter so I could do with the extra warmth, so thought I'd give it a go.
Well, it was a complete revelation. Granted, it was replacing a little budget Class D amp (XTZ Edge A2-300), but even that little thing pumped out 150W into 8 Ohms, so thought the 30W into the inefficient Spendors might still struggle a bit, but it sounds absolutely wonderful (and even inspired me to go out and get some new speakers to replace the S3/5R2's).
Since getting the amp though, I have been meaning to try it in my main system in my living room. I figured this would be a very different kettle of fish, being a much larger room (9m x 2.5m), greater distance from the speakers and driving some bigger (albeit slightly more efficient at 88dB) floor-standers in the shape of my Spendor A7's (yes, I like Spendors!).
Notably, the amp I have been using in that system is also no slouch, a 400W per channel (into 8 Ohms) Nord NC500DM MkII. Yes, it is Class D, but it is a very impressive performer and handles the A7's with aplomb. I had convinced myself that I would need to spend a lot of money to improve on it.
Whilst the Hypex amp excels in clarity/detail (ridiculous specs for THD etc) and also control (the damping factor is through the roof), I must concede, I have been suffering a bit from listening fatigue in that system. Reading around, this is something that many people associate with Class D, but I have also read many reports suggesting that the Hypex/Purifi amps are a bit of a game changer in that regard. In fact, Nord's own marketing headline on the web page is "Class D, with Class A sound".
So anyway, I hooked up the Aleph 3 this morning, expecting things to sound nice with the volume down low playing some jazz, but convinced that things might start to lose grip when I turned it up with a bit of electronic music.
Well blow me down if 30W of pure Class A didn't knock me for 6!!
Having heard it in my second system, I knew it would have the edge in terms of smoothness and musicality, but I have been listening to that thing all day wondering how it's possible that such a low-powered amp could offer so much in the way of power and control. Even the area where I was sure the Nord would have the edge, that being transparency and detail, the Pass Labs highlights just how unnatural and edgy the treble on the Nord is.
Which brings me to the old adage about Watts not all being created equal. A cliche I've heard many times, but only today have I really understood how true that is.
Well, the Aleph 3 has been moved back into my second system and needless to say, all I can think about now is which Class A amp I am going to purchase to replace the Nord in my main system after being completely blown away by it.
So a question to those who use Class A, have I just got lucky with the Aleph 3, or is this what Class A is all about? And then, what to go for (once I've saved up a few quid)?
I've certainly got my eye on the First Watt or newer Pass Labs amps, but also interested in the Colin Wonfer designs being sold under 'EWA' (from ABC Audio). Any others to consider at maybe a maximum price of £3 or £4k?
(I'm planning on SS rather than valves at the minute, but I can always be convinced).
Cheers