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Old 11th March 2013, 03:59 PM   #6531
Julf is offline Julf  Europe
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Quote:
Originally Posted by ua100k View Post
Can you tell us where you got that quote from
I guess from here.
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Old 11th March 2013, 04:10 PM   #6532
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you mean here: AudiogoN Forums: Merrill Audio VERITAS Amps: Any other experiances?
?
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Old 11th March 2013, 09:39 PM   #6533
AP2 is offline AP2  Italy
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Wow!....
DS450M Class D mono amp has a power reserve of 1368 joules of energy, way beyond the power reserve in the Merrill Veritas or the new upcoming M1 amps from Hypex coming out in June. The DS450M has over 176,000 microfards of capacitor storage. The large block transformer, choke regulator, and the Class D switching device in each DS450M amp are in house custom designs exclusive only to Audio Research.

why have used this big capacitors bank?
Mr.Push maybe know..
regards
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Old 11th March 2013, 11:12 PM   #6534
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Choke regulator? If that means a choke-input PSU, it's exactly the wrong thing for class-D -- at low output powers the supply voltage will rise to what a capacitor-input PSU would deliver, but at high currents the supply will drop to what a typical choke supply does, typically 0.7 the cap-input's rating.

And 175000 uF means lots of stray inductance before the switching transistors unless AR made sure they have scads of decoupling right at the devices. McCormack amplifiers didn't even have main filter caps -- they placed smaller caps at each output transistor, to apparently good effect.
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Old 11th March 2013, 11:45 PM   #6535
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i experience a problme with my ncore
when i,m turning it on..the led are turning on nad then turned off and it doesn work at alla
has anyone experienc e something like that?
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Old 11th March 2013, 11:56 PM   #6536
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Quote:
Originally Posted by DSP_Geek View Post
Choke regulator? If that means a choke-input PSU, it's exactly the wrong thing for class-D -- at low output powers the supply voltage will rise to what a capacitor-input PSU would deliver, but at high currents the supply will drop to what a typical choke supply does, typically 0.7 the cap-input's rating.
Not necessarily -apparently Hypex SMPS600 deploys chokes on the HV rails too...
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Old 12th March 2013, 01:21 AM   #6537
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Originally Posted by AP2 View Post
Mr.Push maybe know..
regards
yes, I do. but it's hard to explain.
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Old 12th March 2013, 02:46 AM   #6538
robbbby is offline robbbby  Canada
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Slightly off topic but what is this new hypex m1 amplifier? Google doesn't return much and I figured if some new amp is coming out in June from them there would be much more discussion about it.
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Old 12th March 2013, 06:51 AM   #6539
AP2 is offline AP2  Italy
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Quote:
Originally Posted by mr_push_pull View Post
yes, I do. but it's hard to explain.
If you really know (except that you have problems to explain), then you would not have said that the transient response audio does not have a relationship with the psu.
Unfortunately, the problem is that you do not know. Then stop attacking me.

Regards
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Old 12th March 2013, 07:12 AM   #6540
Julf is offline Julf  Europe
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Quote:
Originally Posted by klamia71 View Post
i experience a problme with my ncore
when i,m turning it on..the led are turning on nad then turned off and it doesn work at alla
has anyone experienc e something like that?
The first thing to check for is a shorted output (maybe just a stray strand of your speaker wire?). If you are really sure there is no short on the output, I suggest contacting hypex, as there have been some nc400's with the overvoltage protection set to slightly too sensitive. It can be recalibrated, but it is a slightly complicated procedure requiring a stable and precise 3V source.
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