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Old 31st May 2012, 09:41 PM   #4271
ghs is offline ghs
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Quote:
Originally Posted by hifial View Post
Well first the Mola-Mola is around $10,000 +/-, maybe more. Second the B&W 802D, while "efficient", always sounds better with more power. I have had amps that had 600w/8oms-900w/4ohm-1200w/2ohm and they would have taken more. As good as they sound with 200w/8ohm they sound better with more and it is not just my observation as many of 802D owners will tell you. They also love to be bi-amped.
+1
Someone used 1 smps on two Ncores and heard the difference(less quality) in comparing 1:1.
I aspect a lot of bridging ncore with hungry speakers like these B&W and Maggies.
The people designed the Ncore 400 make these Mola Mola (Ncore 1200) not for the show.

Jerry
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Old 1st June 2012, 06:33 AM   #4272
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Quote:
Originally Posted by waltzingbear View Post
I did the scratch paper after I emailed the last missive and saw the same thing.
Well, I still think its not a great idea, but current limiting is a little less of a problem than I was thinking.
Alan, I feel the same way, I always feel there is an uncertainty in behavior with bridging...not instability, but perhaps a worsening of distortion that just feels a bit impure. It's my emotional response, not rational. You asked earlier about a minimum Zload rating for ncore, and there is a spec of 1 Ohm minimum on the datasheet.

I notice almost everybody is using sealed cases for their Class-D amps. Aluminum does make a great heatsink material, but even a little ventilation goes a very long way. I would rather accept some holes or slots to enable my electrolytic caps to live longer. If I felt the need for an even quieter power supply, I would rather add some filter capacitance to the smps than even consider a big, uncool and ungreen linear supply. EDIT: extra filter capacitance firmly rejected in datasheet by Hypex, perhaps causes instability--never mind.

I think the 802Ds are fabulous speakers, and if I owned them I would prefer to have the amps never get close to a current shutdown. I really wish B&W offered them in a crossover-less mode (perhaps they do for important people), or at least a tri-amp option. Those bass drivers have amazing power-handling, so fast and honest; I think they are the best I've ever heard.

While we're at it, somebody should be making preamps with 3 output jacks for each audio channel, although the DLCP is getting closer and that might have different needs. Bruno and the boys have kept multi-amping in mind with the Mola-Mola preamp, as its Zout is under an Ohm!

I'm going ahead with plans for mounting my passive ATC20s on stands which also will rest the Velodyne DD12 Plus subs on the bases. The amps will move to a platform just below the ATCs. Sound Anchors is building me hybrid stands for the purpose . I'll take great care to minimize modulation of the ATCs by the subs, and the arrangement will be absolutely time-coherent at the central listening position when I've finished. I do plan to put in ncores after my front end is (finally) redone.

Thank you also for several excellent and very helpful replies, I neglected to mention them earlier.

Last edited by Sam Lord; 1st June 2012 at 06:46 AM.
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Old 1st June 2012, 07:15 AM   #4273
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Default Chassi/Case current RCA

@bruno
I just finish my build in a metal rack case with 2 SMPS600 and 2 NC400. Iím using RCAs connected as explained in the datasheet of the nc400. Everything works and it seems to sound great.
I didnít connect the Safety Earth. Using a simple ďone-contactĒ test light and touching the case it show a current. Itís a little current not dangerous (one cannot feel it) but I wonder if this is normal. This happens only when none of the two RCA is connected. When I connect my Arcam rDAC (this also does not have the main Earth) there is no more current in the chassis.
Should I be worried about it?
Thanks
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Old 1st June 2012, 07:51 AM   #4274
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Ready at last, my musical diet is over!
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Old 1st June 2012, 08:07 AM   #4275
niekos is offline niekos  Netherlands
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Quote:
Originally Posted by sherlockth View Post
Ready at last, my musical diet is over!
Very nice!

I think i have the same cases (still have to arrive from china ).
How did you connect the power button on the front to the nc400/smsp? It looks like a LED illuminated Momentary push button/switch, correct (like this one )?
Have you added some softstart ciruit for it?
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Old 1st June 2012, 08:14 AM   #4276
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Quote:
Originally Posted by niekos View Post
Very nice!

I think i have the same cases (still have to arrive from china ).
How did you connect the power button on the front to the nc400/smsp? It looks like a LED illuminated Momentary push button/switch, correct (like this one )?
Have you added some softstart ciruit for it?
It's a latching button, no softstart, I just connected it's led to the SMPS aux power.
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Old 1st June 2012, 09:18 AM   #4277
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Quote:
Originally Posted by Sam Lord View Post
While we're at it, somebody should be making preamps with 3 output jacks for each audio channel, although the DLCP is getting closer and that might have different needs.
Something like this: ADA Cinema Reference Mach IV A/V Preamp/Processor ??
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Old 1st June 2012, 09:37 AM   #4278
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Quote:
Originally Posted by sherlockth View Post
Ready at last, my musical diet is over!
Nice! But I still think you should twist your inner cables ( as mentioned in the datasheet)
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Old 1st June 2012, 10:32 AM   #4279
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Quote:
Originally Posted by tatobrutto View Post
@bruno
I just finish my build in a metal rack case with 2 SMPS600 and 2 NC400. I’m using RCAs connected as explained in the datasheet of the nc400. Everything works and it seems to sound great.
I didn’t connect the Safety Earth. Using a simple “one-contact” test light and touching the case it show a current. It’s a little current not dangerous (one cannot feel it) but I wonder if this is normal. This happens only when none of the two RCA is connected. When I connect my Arcam rDAC (this also does not have the main Earth) there is no more current in the chassis.
Should I be worried about it?
Thanks
most if not all SMPS's have some small ceramic capacitor connected from mains to chassis.
I have a generic SMPS in front of me and the caps (Y filter) are shown on the silk screen but not soldered. I guess it has to do with country-specific regulations.
the Hypex SMPS's does not use Y filters at the input AFAIK, Bruno explained a few times why he doesn't use them.
don't be too sure that you can't feel that current, I wouldn't try touching the chassis and anything that's earthed simultaneously.
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Old 1st June 2012, 12:20 PM   #4280
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Quote:
Originally Posted by mr_push_pull View Post
most if not all SMPS's have some small ceramic capacitor connected from mains to chassis.
I have a generic SMPS in front of me and the caps (Y filter) are shown on the silk screen but not soldered. I guess it has to do with country-specific regulations.
the Hypex SMPS's does not use Y filters at the input AFAIK, Bruno explained a few times why he doesn't use them.
don't be too sure that you can't feel that current, I wouldn't try touching the chassis and anything that's earthed simultaneously.
thanks push_pull for your interest in my question.
In fact, I touched the chassis very carefully and I hopefully didnít feel that current.
Iím not really familiar with electronic so my knowledge about it end just after the Ohmís law.
When the RCA line input are connected to the Arcam rDAC the current disappear . I thought that, maybe, the current go through the USB cable to the PC that finally has the connection to the safety earth so it disappears.
Most of the nc400 builds have safety earth and uses balanced connections. But since I donít have a balanced source and the amp will be installed in a computer rack full of other devices I thought it would be better to try without safety earth. So I carefully respected the prescriptions of Bruno here in the attached pdf (see ďChoice AĒ at the end).
What I should do? Try to connect the safe earth as precautions? Making the assumption the sound quality is not compromised by it, is this a valid solution or just a bad workaround?
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