Thread: Accuphase Class A vs. Class A/B

What are the main differences between Accuphase Class A and A/B amps. I'm trying to decide between an A-65 or P-6100. Speakers are JBL S4700.

Originally Posted by Big Dave

What are the main differences between Accuphase Class A and A/B amps. I'm trying to decide between an A-65 or P-6100. Speakers are JBL S4700.

Hi Dave,

Greetings from Singapore (I live and work here, but I'm from London). I thought maybe I could assist in giving you a few pointers as to what differences I've come across between Accuphase class A and A/B. Please accept that my ears are my ears and maybe good, bad, old....take what I say with a pinch of salt. Over the last 2.5 years, I've heard Accuphase quite extensively (the Accuphase master importer and dealer is 5mins from my house here in Singapore and my wife is Japanese and we go to Tokyo 2 to 3 times a year where I listen to Accuphase setups there as well).

The Class A amps have absolutely wonderful midrange texture and a detailed nuance with a relaxed sound. As output is at full power all the time being class A, it seems things such as bass sound full even at low volume. This describes the sound of both Accuphase A-65 and A-46. I've heard both of these with a home demo with my Harbeth M40.1. My Harbeth's Dave are a different beast to the JBL's (wonderful speakers those 4700 btw) being only around 84db efficient, but they have a really easy impedance never falling below 4.5ohms and staying mostly between 5 to 8. So an inefficient speaker, but an easy load.

I found listening to the A-46 underpowered for orchestral symphonies, but the A-65 seemed to have ample reserve, though I found the bass wasn't as whip crack fast as I hoped. However, I've heard the A-65 with more efficient speakers with very braced cabinets like Vivid audio B1 (compared to Harbeth's traditional BBC lossy cabinets) and the bass sounded solid (so maybe the Harbeth doesn't get on totally with class A, don't know)

I then audition the P-6100 and with my M40.1. For me, this had that whip crack solid bass control and was very vivid. The Images were sharp and more carved out compared to the A-65, but the A-65 had a certain texture with acoustic instruments and voice. Best example I can give is with P-6100 you saw the clear outlines of a woman's mouth while she sang, where as with A-65 you could almost sense the texture of here tongue around the mic where as the outline of her mouth wasn't as sharply visible like the P-6100. But the P-6100 was very vivid, had more shimmer to the sound, whereas the A-65 was texture, nuance and relaxed. The P-6100 does sound a little faster. But it was in the bass that the P-6100 won me over. Absolute solidity with clear bass outline and rhythm. Not fat. Not hard. Had warmth, but was solid and fast well. Real world bass.

I heard the grand daddy A200 in Japan with the JBL K2 S9800 and they seemed to have the best of both worlds, but at a price..... I get every quarter the latest issue of Stereo Sound (Japans High-end Journal) and in the latest issue an owner of the JBL 9500 (Japan's favorite JBL speaker...ever!) a feature on customer setup at home shows him using a P-6100.

Phew...hope this helps, but as I said earlier, this is with my ears.

Regards

tmokbel

Originally Posted by socfan12

Welcome to AS, tmokbel! Great writeup and description on the Accuphase amps!

Thank you for the warm welcome Allen. I felt the need to step forward to assist where I could with Dave's questions as I thought I may know a little here and a little there. I think we've all been in situations where certain things really interest us, but for one reason or another, getting to see it, feel it, touch it, hear it isn't so easy and that's when we need solid and as much an unbiased feedback (the unbiased bit is always difficult of course) as we can provide to others.

Last September we had a great pleasure to review anniversary Accuphase set (DP-900/DC-901+C-3800+A-200) - http://soundrebels.com/artykuly/rece...1-c-3800-a-200 . The A-200 made a great job - very musical and powerful sound with warm midrange, sweet treble and deep. but not so fast bass. We compared that set with our complete Reimyo system, so the start level was quite high.

Originally Posted by Vladimir

Hi tmokbel.

In your experience which is the best Accuphase integrated amp that can be bought second hand under $5000?

Glad to have you on the forum.

Cheers,

Vlad

Hello Vlad,

If using the Accuphase integrated to power the BMW CM1's, I would look at one of the higher powered integrated amps. The CM1's from the specs have a reasonable impedance of 8ohms (minimum 5), but are quite inefficient at 84db. You need an amp with headroom that will not be restricted by the B&W's inefficiency. Either the E-450 / E-460 should do the trick.

The class A integrated amps certainly have their charms, but inefficient speakers need watts. The laws of physics and electrical engineering are well documented and applies no less to the audiophile world.

Hope this helps.

Tarik

anyone who can comment on Accuphase A vs. A/B in the context of Magnepan speakers? Thank you