Hello Eric
I am in the UK right now, but i have confirmaton that the LM4562 package is waiting for me at home. So it's very exiting.
It's very interesting to find out if the LM4562 change the sound, and also if the might further improve THD performance.
For now i am kept in the dark 🙂
I am in the UK right now, but i have confirmaton that the LM4562 package is waiting for me at home. So it's very exiting.
It's very interesting to find out if the LM4562 change the sound, and also if the might further improve THD performance.
For now i am kept in the dark 🙂
Hallo Lars,
Don't keep us in the dark to long.
For me, I am planning to buy a set of Dali Helicon's and those speakers are no easy load and do need some power so there is some sense of urgency at this side of the line.
Hope to hear from you soon.
Regards, Eric.
Don't keep us in the dark to long.
For me, I am planning to buy a set of Dali Helicon's and those speakers are no easy load and do need some power so there is some sense of urgency at this side of the line.
Hope to hear from you soon.
Regards, Eric.
Hi Lars,
It may be a little off topic but I know you could help me. I've just finished Zappulse 2.3 SE few days ago. It sounds excellent. The problem is I used a tube preamp and it has some background noise from the pre. When the noise goes through the module, it's quite annoying at my speaker. If I were to put a resister at the input of the module around 10-20K to reduce the noise, is it OK? Please recommend the proper value.
I also concern about the DC from preamp. Is it wise to put some cap at the input too? If yes, I plan to put 2.2-4.7 mfd at the input of the module for protection.
Last question for NCD topic, Does it sound better than Zappulse 2.3 SE? If yes, in what way does it better? Thanks for your help.
Kittikun😀
It may be a little off topic but I know you could help me. I've just finished Zappulse 2.3 SE few days ago. It sounds excellent. The problem is I used a tube preamp and it has some background noise from the pre. When the noise goes through the module, it's quite annoying at my speaker. If I were to put a resister at the input of the module around 10-20K to reduce the noise, is it OK? Please recommend the proper value.
I also concern about the DC from preamp. Is it wise to put some cap at the input too? If yes, I plan to put 2.2-4.7 mfd at the input of the module for protection.
Last question for NCD topic, Does it sound better than Zappulse 2.3 SE? If yes, in what way does it better? Thanks for your help.
Kittikun😀
Listening impressions???
Hi,
There does not seem to be too many people posting listening impressions for the new NCD amps. I'm interested in the comparison between the pre & post filter feedback setting especially for the dynamics, and a comparison between the UCD (not to say which one is better, just listening differences).
Regards,
Dean
Hi,
There does not seem to be too many people posting listening impressions for the new NCD amps. I'm interested in the comparison between the pre & post filter feedback setting especially for the dynamics, and a comparison between the UCD (not to say which one is better, just listening differences).
Regards,
Dean
Re: Listening impressions???
Prefilter feedback is better. Very sensitive to transformer performance. I tried R-core and O-core transformers of the same rating, the O-core presented a more realistic bass.
deandob said:
Prefilter feedback is better. Very sensitive to transformer performance. I tried R-core and O-core transformers of the same rating, the O-core presented a more realistic bass.
Soongsc.
What attributes would you say are better about the prefilter feedback? Have you compared to a UCD?
Regards,
Dean
What attributes would you say are better about the prefilter feedback? Have you compared to a UCD?
Regards,
Dean
deandob said:
I have not compared with the Ucd, but here is a more complete record of what I experienced.
http://www.diyaudio.com/forums/showthread.php?postid=1074300#post1074300
kittikun: I am sorry to be unable to give you advice on products from companies other than my own. I suggest you contact their technical support.
You would find the information you are looking for in the NewClassD cookbook, that can be downloaded from our website. These solutions are designed for NewClassD amplifier modules. Whether the same solutions can be applied with your ZAPpulse is something that can be considered. But unfortunately not something i can give you advice on.
LM4562: My initial testings show that THD data does not improve with this chip compared to LM6172, which actually has very good THD performance, almost comparable to the best i have tested so far (OPA 627).
However the sound may very well be better on LM4562, but i have until now only made functional tests of sound performance, no A/B tests.
You would find the information you are looking for in the NewClassD cookbook, that can be downloaded from our website. These solutions are designed for NewClassD amplifier modules. Whether the same solutions can be applied with your ZAPpulse is something that can be considered. But unfortunately not something i can give you advice on.
LM4562: My initial testings show that THD data does not improve with this chip compared to LM6172, which actually has very good THD performance, almost comparable to the best i have tested so far (OPA 627).
However the sound may very well be better on LM4562, but i have until now only made functional tests of sound performance, no A/B tests.
The golden mean said:
I think most toroidal transformers have cores a rectangular cross section, this type of core has a round cross section. Probably it's just call the O-core to differentiate itself from the market. However, there do seem to be other reports indicating positive results, that's why I tried it.
The round cross section gives O-Cores the lowest possible distance per winding = lowest impedance. I suspect that is what gives them an advantage over normal toroids.
On the other hand, the ones i have tested, have had more mechanical noise than normal toroids.
On the other hand, the ones i have tested, have had more mechanical noise than normal toroids.
Lars Clausen said:
Probably caused by loose winding? Normal rectagular shaped cores will put more mechanical stress on the wires when winding through the corners, thus making them more stable. I had to order samples from China because I could not get them here in Taiwan. I was just surprised that the turn on current was much larger than the R-core I tried.
The only time I had problems with mechanical noise was with the traditional transformers. Many people still like them for some reason.
Lars Clausen said:
Hallo Lars,
Nice to hear the first results on the LM4562, but your quote "may very well be better " does that imply that you did not listen to them at all ? e.g. "just" measurement or that you did listen but without a reference ?
Hope to hear your impression on a a/b test on this site soon.
Regards, Eric.
Wish me luck !!!!
Boys will be boys !!! On the brink of 2006 I've just ordered my first set of class-D amplifiers :
- 2 x NCD with LM4562
- 2 x PSU 15.000/6 wire
- 2 x Softstart / filter combo
Now the search for some proper housing/enclosures begins. If all goes well I'll be able to start building somewhere in january 2007.
I am verry, verry, verry curious about this all....
B.T.W. I just listened to a "Musical Fidelity A5 Amplifier". A friend of mine is inclined to buy either this one or a Primare A30. That would be a lovely reference point nah....???
Happy new year to you all (and wish me luck ;-))
Eric.
Boys will be boys !!! On the brink of 2006 I've just ordered my first set of class-D amplifiers :
- 2 x NCD with LM4562
- 2 x PSU 15.000/6 wire
- 2 x Softstart / filter combo
Now the search for some proper housing/enclosures begins. If all goes well I'll be able to start building somewhere in january 2007.
I am verry, verry, verry curious about this all....
B.T.W. I just listened to a "Musical Fidelity A5 Amplifier". A friend of mine is inclined to buy either this one or a Primare A30. That would be a lovely reference point nah....???
Happy new year to you all (and wish me luck ;-))
Eric.
One thing I enjoy with this amp is the ability to build in a polarity switch making it very easy to test recording polarity, some of which I find were recorded polarity inversed. I just demonstrated this to a friend a few days ago, and he was amazed with the difference.
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