Test-driving my new born Mono AlephX High Power Amp,
I kept an eye on the scope while playing music.
I put the scope in XY configuration, connecting the A-channel to the +out and the B-channel to the -out.
The whole monoblock is biased high enough: 750mA with 0.47ohm source resistors. The source is a cd player directly connected to the input, non-balanced.
Power supply is +/- 24V
The output drives two 8ohm speakers in parallel.
I played different cd's till finally I took Tori Amos's StrangeLittleGirls from the shelf.
I could not believe my ears and my eyes!!
The volume was rather high compared with other cd’s. I know that the Tori Amos record is superb when talking dynamics, but I wonder what the cause of this behaviour could be.
Thinking that AlephX should be able to produce them accurately, knowing that my speakers
are not the best, but not bad at all and hoping that the cd is well recorded.
The speakers got mad, the scope too, had to dramatically reduce the volume, thinking the AlephX was about to blow!
I started measuring DC and all other kind of voltages, but everything was normal.
There's no way to take a picture from the scope because dynamics are too fast and I don't have a memory scope, but I made an approximated drawing of the distortion.
Is this just normal clipping, severe clipping, is there something I overlooked in building the amp, I wonder….
Did someone else experience such behaviour, Peter…others?
/Hugo – thinks Tori Amos is a naughty girl.
I kept an eye on the scope while playing music.
I put the scope in XY configuration, connecting the A-channel to the +out and the B-channel to the -out.
The whole monoblock is biased high enough: 750mA with 0.47ohm source resistors. The source is a cd player directly connected to the input, non-balanced.
Power supply is +/- 24V
The output drives two 8ohm speakers in parallel.
I played different cd's till finally I took Tori Amos's StrangeLittleGirls from the shelf.
I could not believe my ears and my eyes!!
The volume was rather high compared with other cd’s. I know that the Tori Amos record is superb when talking dynamics, but I wonder what the cause of this behaviour could be.
Thinking that AlephX should be able to produce them accurately, knowing that my speakers
are not the best, but not bad at all and hoping that the cd is well recorded.
The speakers got mad, the scope too, had to dramatically reduce the volume, thinking the AlephX was about to blow!
I started measuring DC and all other kind of voltages, but everything was normal.
There's no way to take a picture from the scope because dynamics are too fast and I don't have a memory scope, but I made an approximated drawing of the distortion.
Is this just normal clipping, severe clipping, is there something I overlooked in building the amp, I wonder….
Did someone else experience such behaviour, Peter…others?
/Hugo – thinks Tori Amos is a naughty girl.
Attachments
I had the same with a Michael Jackson album. I was happily testing my Aleph 4 with one eye on the scope and one on the speakers and the Aleph. Suddenly with the first song I say massive clipping. I mean every bass line clipped. I jumped up the unplug everything in 1 second...
After looking and looking... and grabbing it with cooledit it seemed the CD clips..... brrr... bad Michael! He sure did scare the hell out of me!
Edwin
till said:
I'm not saying this cd is a superb recording, but it definitely has superb dynamics
Can you give us the label of the Norrington / Berlioz symphonie fantastique?To Taco: Glad I'm not the only one. Still want to know what's the problem here. Maybe Nelson could explain something.
First track of the cd is just amazing.
I just tried another one: In Requiem on Yara from Rabih Abou-Khalil (Enja record ENJ-9360 2) http://www.enjarecords.com/c9360.htm
The amp (or my cd-player, or my speakers, or..or..) shows the same strange behaviour with the cello. But here the midrange suffers from heavy crackle. I could compare the sound with the sound of a speaker with a broken voice coil.
/Hugo
SY - In what way is Tori Amos a POSER??? Maybe you should
think twice before slagging off on one of the most talented
musicians making music today. Or keep your opinion to yourself
(you don't here me saying a word about Mr. Jackson do you?)
Netlist - I refer to a lot of Tori's CD's as reference material when
evaluating equipment. I don't have Strange Little here to listen
to right now, but had not noticed anything strange about it in
the past.... It wouldn't happen to be a BMG disc or something
like that would it?
Pics of the Aleph-X????!!!
think twice before slagging off on one of the most talented
musicians making music today. Or keep your opinion to yourself
(you don't here me saying a word about Mr. Jackson do you?)
Netlist - I refer to a lot of Tori's CD's as reference material when
evaluating equipment. I don't have Strange Little here to listen
to right now, but had not noticed anything strange about it in
the past.... It wouldn't happen to be a BMG disc or something
like that would it?
Pics of the Aleph-X????!!!
Alright, alright, this thread was not intended to start a discussion on musical preferences.
In this thread, I don't care if Tori is a poseur or not, I just wanted to say what I said in the first post.
That said, I noticed that when I unplugged the second speaker, which is paralleled, things behave better. The XY-axis is not a bow anymore, except at top-level volume.
I guess it has something to do with impedance.
I’ll post some pictures soon, in another thread, as those are way off topic.
/Hugo
In this thread, I don't care if Tori is a poseur or not, I just wanted to say what I said in the first post.
That said, I noticed that when I unplugged the second speaker, which is paralleled, things behave better. The XY-axis is not a bow anymore, except at top-level volume.
I guess it has something to do with impedance.
I’ll post some pictures soon, in another thread, as those are way off topic.
/Hugo
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