Yes TA, this is a pathfinding mission for me as (Mean)well š.
These HRP units were previously used to power the M2OPS, but wired in a different way that did not have a well defined star ground and was ultimately not satisfied. This time I followed lhguam's wiring diagram and already see the AC at the speaker output is much reduced, 0.1mV, with both channels sharing a power supply.
I might have to tweak the external SMPS chassis for better cooling, after 2hrs its very warm, boarderline hot. The Watt-O-Meter plug is showing 245W drawn from the wall. Either more holes in the baseplate or small Noctua fan added.
I agree TA, the real test will be listening to music. Without a psu in the main chassis internal space is cavernous and would accommodate any type of capacitor tweaking if necessary. The limiting factor would be what capacitance will be a problem for startup surge throwing the smps's into hiccup mode.
Hi Gary,
This is the chassis:
https://www.ebay.com/itm/1627951256...sGheTUqSyi&var=&widget_ver=artemis&media=COPY
These HRP units were previously used to power the M2OPS, but wired in a different way that did not have a well defined star ground and was ultimately not satisfied. This time I followed lhguam's wiring diagram and already see the AC at the speaker output is much reduced, 0.1mV, with both channels sharing a power supply.
I might have to tweak the external SMPS chassis for better cooling, after 2hrs its very warm, boarderline hot. The Watt-O-Meter plug is showing 245W drawn from the wall. Either more holes in the baseplate or small Noctua fan added.
I agree TA, the real test will be listening to music. Without a psu in the main chassis internal space is cavernous and would accommodate any type of capacitor tweaking if necessary. The limiting factor would be what capacitance will be a problem for startup surge throwing the smps's into hiccup mode.
Hi Gary,
This is the chassis:
https://www.ebay.com/itm/1627951256...sGheTUqSyi&var=&widget_ver=artemis&media=COPY
Thanks for those thoughts TA - I would conclude from your remarks that you lean towards a linear supply.
That then brings up the question - a normal Pass type non reg supply or regulated?
That then brings up the question - a normal Pass type non reg supply or regulated?
Vunce,
That's a big chassis with beefy heat sinks. š
You planning to go dual-mono when your transformer(s) arrive?
That's a big chassis with beefy heat sinks. š
You planning to go dual-mono when your transformer(s) arrive?
If one considers a capacitance multiplier as a form of soft regulation (check out early Pass Zen v4 and v5), then I have had success with both passive and active filtering. The better passive ones were either CRCRC or CLC.
Capacitance multipliers require careful implementation to be effective. They require careful selection of the pass transistors. I prefer complementary feedback pairs with low VceSat bipolar devices. And they must be preceded by a good CRC filter and followed by sufficient bulk capacitance.
Capacitance multipliers require careful implementation to be effective. They require careful selection of the pass transistors. I prefer complementary feedback pairs with low VceSat bipolar devices. And they must be preceded by a good CRC filter and followed by sufficient bulk capacitance.
Yes, I feel the benefits are worth the additional cost and always will build a dual mono linear supply
.
I have that same chassis. I used it for a XA252 and as well as another amp. I just bought two more of them. They have them on Aliexpress as well. It is hard to go wrong with the price. They are simple and built like a tank which I really like.
That chassis is perfect for the XA252. And since you have to drill holes anyways, it works out pretty good.
I like that the heat sinks look like the old threshold heat sinks. I have a S500 and I would say that the chassis you have is about 90% of the size of the old threshold.
I like that the heat sinks look like the old threshold heat sinks. I have a S500 and I would say that the chassis you have is about 90% of the size of the old threshold.
Thanks Vunce and Mike for the 2 chassis links. I also like the look of the heatsink fins.
Had a look at both sites, same chassis and.....
Ebay - $483.00 USD shipped.
Aliexpress = $350.00 USD shipped.
A big difference in price, it pays to shop around these days especially when postage/freight is such a large portion of the overall price.
Had a look at both sites, same chassis and.....
Ebay - $483.00 USD shipped.
Aliexpress = $350.00 USD shipped.
A big difference in price, it pays to shop around these days especially when postage/freight is such a large portion of the overall price.
I installed three pin 'aviation connectors' that were in the parts bin for the external psu. 16ga is the maximum size conductor and that barely fits the solder tab. I would like a more robust connector for this application, what do you fellas recommend?
Great price on that chassis Gary!
Great price on that chassis Gary!
Attachments
Yeh, I have had no issues with using Aliexpress.
I have used XLR connectors in the past for PSU connections, some types have higher current ratings.
I have used XLR connectors in the past for PSU connections, some types have higher current ratings.
Have never used the PowerConn from Neutrik, but the Neutrik XLR TOP series is rated at 16amps - most of their other XLR's are rated at 6amps.
Looks like the PowerConn is mains rated at 20amps per contact - might be the way to go.
Looks like the PowerConn is mains rated at 20amps per contact - might be the way to go.
They are rated at 250VAC mains use at 20 amps, so quite rugged. Their technical documentation I read does not mention a DC rating.
I would say they would be fine at the nominal DC voltage levels for class A amps and you would only be putting a few amps through them anyway, and if you did not disconnect them while powered up then DC arcing will not be a problem.
I think they would be fine, as I said I have used Neutrik XLR connectors before for this purpose without a problem and the PowerCon range are even more rugged.
I would say they would be fine at the nominal DC voltage levels for class A amps and you would only be putting a few amps through them anyway, and if you did not disconnect them while powered up then DC arcing will not be a problem.
I think they would be fine, as I said I have used Neutrik XLR connectors before for this purpose without a problem and the PowerCon range are even more rugged.
Neutrik specifically says that PowerCon are not for DC use. I am not saying that they are not suitable. That's up to each of you. However, they most certainly are not made for that application.
NAC3FXXA-W-S is the one that has been suggested. While its primary rating may be for AC, it has been successfully used āoff labelā for modest DC applications such as what we are discussing.
https://www.neutrik.com/en/products/audio/powercon
https://www.neutrik.com/en/products/audio/powercon
IAIMH,
Was there a technical reason from Neutrik why not to use for DC?
Or human error mixing up AC and plugging into DC ā¦.BOOM!!
^ I posted a summary of my conversation with the Neutrik engineer I called in another thread ...
Conversation With Fred From Neutrik
"He said in plain terms to not use either the PowerCon nor the SpeakOn for DC applications at all. I asked him if he could please explain at a novice level for my specific application. I asked was it dangerous / what could go wrong etc.?
He took the time to explain to me why those products were not suitable for me. That is not to say that they aren't suitable for anyone else... he was very polite, but strong in his wording that he doesn't think it's a good idea to use those products for DC. He'd be happy to explain why to anyone for their particular application over a quick / direct inquiry."
Conversation With Fred From Neutrik
"He said in plain terms to not use either the PowerCon nor the SpeakOn for DC applications at all. I asked him if he could please explain at a novice level for my specific application. I asked was it dangerous / what could go wrong etc.?
He took the time to explain to me why those products were not suitable for me. That is not to say that they aren't suitable for anyone else... he was very polite, but strong in his wording that he doesn't think it's a good idea to use those products for DC. He'd be happy to explain why to anyone for their particular application over a quick / direct inquiry."
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