review33.com: 影音天地: 點解要玩Class A 類 amp? 例如Accuphase A50

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[#1] 點解要玩Class A 類 amp? 例如Accuphase A50 Class A amp 有咩好處同壞處對比其他類power amp? thank you!		setfootin 正式會員 220.xxx.xxx.157	2009-03-19 17:34

[#2] 點解要玩Class A 類 amp? 例如Accuphase A50
my friend sold the a50 and replaced by pass labs x600 class ab. he would not go back to the a50.

cpu8088

正式會員
115.xxx.xxx.214

2009-03-19 17:47

[#3] 點解要玩Class A 類 amp? 例如Accuphase A50
class a is good if one considers the heavier amp the better. so you pay for the heat sinks, chassis and higher electricity bill.

cpu8088

正式會員
115.xxx.xxx.214

2009-03-19 17:48

[#4] 點解要玩Class A 類 amp? 例如Accuphase A50
I am using an A-60, and I find that, compared to many other amps I have heard, it has much better delicacy and musicality. A less mechanical sound. Although the power rating is low, I also find that it sounds more powerful than my other amps (including a pair of 500W Rowland monoblocks) and controls my speakers better. Contrary to many stereotypical beliefs, it does not sound slow. In fact, I find that the "non-mechanicalness" comes from the fact that it reacts quickly to delicate sounds (such as ambiance and decay) and a general good sense of pace, rhythm and timing.

For the technical benefits of class A, I think I should leave it to wikipedia and other info sites out there.

http://en.wikipedia.org/wiki/Electronic_amplifier#Class_A

However, I don't think one can "generalize" whether Class A is better or not. There are so many ways to design hifi and one feature alone cannot guarantee good sound.

accudude

正式會員
203.xxx.xxx.158

2009-03-19 17:57

[#5] 點解要玩Class A 類 amp? 例如Accuphase A50
Thanks accudude,

especially to your unbias opinions, but what's the bad thing about class A?

setfootin

正式會員
220.xxx.xxx.157

2009-03-19 18:13

[#6] 點解要玩Class A 類 amp? 例如Accuphase A50
The bad thing is definitely the waste of energy. The amp is pretty warm even at idle. However, of many class A amps I have seen, Accuphase seems less hot already. If the amp is sitting on the floor and you are wearing shorts :), you can feel the warmth if you are walking by even about 8 inches away. I can keep my hand on its heatsinks for a pretty long time without getting burnt. For a Krell FPB (which operates in Class A on a sliding bias basis), you can probably feel its heat about 1.5 feet away. The heat can be a problem if the heat dissipation measures or build quality is not too good. Parts can wear quicker. A few brands have stood through the test of time and are still producing Class A amps regularly, such as Accuphase, Sugden, Pass, to name a few.

Other than that, there is also the obviously electrity wastage (A60 uses 315W at idle) and related $ and environmental issues.

For me, despite all of these, I just couldn't resist the sound :)

accudude

正式會員
203.xxx.xxx.158

2009-03-19 18:27

[#7] 點解要玩Class A 類 amp? 例如Accuphase A50
Do you know what is the output power of accuphase A45 similar to normal class a/b amp? how do i know it suits my floorstand speakers which at 88db recommended 350 Watt amp?

setfootin

正式會員
116.xxx.xxx.15

2009-03-19 20:37

[#8] 點解要玩Class A 類 amp? 例如Accuphase A50
the biggest advantage of class a amp no cross over distortion, thats why it sounds sweet

batmanames04

正式會員
114.xxx.xxx.102

2009-03-19 20:50

[#9] 點解要玩Class A 類 amp? 例如Accuphase A50
do you mean crossover distortion instead of "cross over" distortion?

cpu8088

正式會員
115.xxx.xxx.214

2009-03-20 06:07

[#10] 點解要玩Class A 類 amp? 例如Accuphase A50
應係cross distortion, 無over, 但會明白佢意思..

setfootin

正式會員
220.xxx.xxx.157

2009-03-20 09:38

[#11] 點解要玩Class A 類 amp? 例如Accuphase A50
"Do you know what is the output power of accuphase A45 similar to normal class a/b amp?"

The power rating should be basically as stated (i.e. 45W as stated into 8 ohms) from a measurement stand point. However, there are a few things worth noting. 1)They generally understate their rated power specifications and a few magazines have tested their amps to have power beyond the stated number. 2) Accuphase's class A series has the ability to double down on each halving of impedance down to very low impedance, hence the perceived ability to drive speakers. 3)For each of their class A amp, Accuphase has an equivalent level Class AB amp. For the A45, I believe it is the 4100. Driving ability should be somewhat similar (like A60 and 7100). You may want to check that out.

accudude

正式會員
203.xxx.xxx.158

2009-03-20 10:04

[#12] 點解要玩Class A 類 amp? 例如Accuphase A50
A-50唔錯呀, 我都用緊!!

"Class A amp 有咩好處同壞處對比其他類power amp?"

絕對係口味問題!!

sunboy

正式會員
219.xxx.xxx.158

2009-03-20 10:55

[#13] 點解要玩Class A 類 amp? 例如Accuphase A50
咁Class A 係咩味道?

setfootin

正式會員
220.xxx.xxx.157

2009-03-20 11:02

[#14] 點解要玩Class A 類 amp? 例如Accuphase A50

class A 音色上嘅特徵係乜？
class AB 音色上嘅特徵又係乜？