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Old 5th November 2014, 08:55 AM   #1
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Default Hypex Ncore vs B&O ASC vs TPA3116

Hi everyone. I'm planning to build a class D amp and would like to get your opinion about these 3. Anyone with experience or heard all of them; care to share with me your observation about the sound of each? The Tripath amps I previously owned all have some "rough/screechy" highs, do these 3 share the same high frequency signature with the T-amps? I'm also looking for an amp with coherent low end, it will be paired with MA10Ps in pensil cabinets.

I would appreciate your help.

Thanks,
Anton

Last edited by a3cervo; 5th November 2014 at 09:06 AM. Reason: added a sentence
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Old 5th November 2014, 10:52 AM   #2
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Default have you looked at these?

Hi,

Have you looked at the amps at Class-dmodule.com?

here is a german forum who tested these against hypex B&O and abletec

Neue Class D Module aus China Testbericht, Elektronik - HIFI-FORUM

Michel

PS. I'm sorry if this is not allowed (class-dmodule.com is my company)
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Old 5th November 2014, 11:51 AM   #3
Julf is offline Julf  Europe
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Quote:
Originally Posted by Mies1971 View Post
here is a german forum who tested these against hypex B&O and abletec
Firstly, it doesn't really seem to be any sort of proper test, and secondly the hypex modules he talks about are not ncores but ucd180's.

Quote:
I'm sorry if this is not allowed (class-dmodule.com is my company)
At least you are up front and open about it...
__________________
"To try to judge the real from the false will always be hard. In this fast-growing art of 'high fidelity' the quackery will bear a solid gilt edge that will fool many people" - Paul W Klipsch, 1953
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Old 6th November 2014, 09:07 PM   #4
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...and BaoYeHeng provides some rather decent datasheets to go with the modules. Doesn't indicate pre or post-filter feedback but it looks to me like a better than average pre-filter feedback implementation. If so, nCore is literally a couple orders of magnitude more capable in controlling a driver.

Michel, it'd be up to a mod to decide whether post 2 meets the blatantly commercial criteria of the rules (see link at top of page).
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Old 6th November 2014, 10:15 PM   #5
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Default LJM 15D modules

Quote:
Originally Posted by a3cervo View Post
Hi everyone. I'm planning to build a class D amp and would like to get your opinion about these 3. Anyone with experience or heard all of them; care to share with me your observation about the sound of each? The Tripath amps I previously owned all have some "rough/screechy" highs, do these 3 share the same high frequency signature with the T-amps? I'm also looking for an amp with coherent low end, it will be paired with MA10Ps in pensil cabinets.

I would appreciate your help.

Thanks,
Anton
I'm an enthousiastic user of the class D LJM L15D Pro modules based on IRS2092 chipset. I compared these with Hypex UCD180 oem version and really prefer the L15D. This because of the more lively and natural presentation.

But an important underestimated aspect is the input impedance. The Hypex modules are provided with input buffers which increase the normal amplifier module impedance of 1,8 kOhm into 100 kOhm. The L15D have an input impedance of about 3,3 kOhm. A fair comparison would be without the buffer of the UCD180. But I do not own (borrowed them) these modules and will not resolder someone's else property.

For a friend who owns expensive (4500 Euro) Phonar speakers (EDMA modified) we auditioned some amplifiers and he loved my own assembled stereo L15D modules with single Hypex SMPS module (costs €150 without enclosure etc). So I had to build another set for myself, which replaces my DIY single ended tube amplifier. I always loved my SE Tubes but these class D modules handles my speakers more well with more attack and control.

Would be interesting to compare these L15D with the modules of Michel listed on his class-dmodule.com site, because they offer the same IRS2092 chipset. At least this chipset is capable of high audio qualities and to be rcommended.

My experience with low impedance input amplifiers is that potmeters for volume control in front of the amp are unusable. This sounds bad. A driver with low output impedance is absolutely required. The best solution I experienced is a step-down transformer before the amp. Yes, a transformer volume control (TVC) is the best solution but very expensive (>€500). I solved this issue wit Sowter transformers with a selectable -10 dB attenuation (€175 for 2 pcs) and use my streaming device for the fine volume control. I love it
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Old 7th November 2014, 01:15 AM   #6
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^ Richard, thanks for sharing your experience...can you pls post a pic of the L15D amp you mentioned? & where did you buy it?
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Old 7th November 2014, 07:02 AM   #7
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Richard,

About the low input impendance, you are right this is with our modules also the case is is only 4,7Kohm, the germany guy solved this by adding some input caps on the module, and I am working with the factory to change some components in the imput stage to increase the impendance (future updates). at the moment the German forum in preparing a group purchasing projects for our modules because they were very happy about the sound especially when the module had warmed up a bit. I'm happy to provide one of you guys a sample mono module for 50% discount (MY1-151PA) if you would test it and write about it.

Not only to help my business (lets be honest) but mainly that I have been searching for a plug and play amp for more that a year and listened to lots of them but the good ones are hard to get and the one you can get have lots of problems and are badly designed (bus pumping) or are very expensive, Finally I found one manufactured that has the best price performance and a very nice sound in the whole spectrum, and are ruggedly designed for PA and High end use, and want to share this with all of you.

Michel
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Old 7th November 2014, 10:12 AM   #8
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Quote:
Originally Posted by a3cervo View Post
^ Richard, thanks for sharing your experience...can you pls post a pic of the L15D amp you mentioned? & where did you buy it?
For some pics and prices just Google or searh the Ebay for LJM L15D Pro.
An interesting link to read about thes boards is: L15D und stärker Digital Audio Amp mit IRS2092 [Archiv] - DIY-HIFI-Forum
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Old 7th November 2014, 10:28 AM   #9
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Quote:
Originally Posted by Mies1971 View Post
Richard,

About the low input impendance, you are right this is with our modules also the case is is only 4,7Kohm, the germany guy solved this by adding some input caps on the module, and I am working with the factory to change some components in the imput stage to increase the impendance (future updates). at the moment the German forum in preparing a group purchasing projects for our modules because they were very happy about the sound especially when the module had warmed up a bit. I'm happy to provide one of you guys a sample mono module for 50% discount (MY1-151PA) if you would test it and write about it.

Not only to help my business (lets be honest) but mainly that I have been searching for a plug and play amp for more that a year and listened to lots of them but the good ones are hard to get and the one you can get have lots of problems and are badly designed (bus pumping) or are very expensive, Finally I found one manufactured that has the best price performance and a very nice sound in the whole spectrum, and are ruggedly designed for PA and High end use, and want to share this with all of you.

Michel
Hi Michel, Your boards are really interesting and based on a fine chipset. It's a great idea to combine them with an integrated power supply. Each module has its own supply and no wiring needed, what makes it more simple to built an amp. I hope DC protection for the speaker is integrated (supply voltage switched off when DC is measured at speaker terminal)?

Be informed that placing Caps at the input will not change the input impedance for AC signals (so music), only block DC signals. May be the input caps are not really needed because the music source (i.e. CD player) will have output capacitors which block the dc from the source.
I removed the input capacitors (small Elco's) from the L15D boards resulting in a better sound (elco's are not the finest componenets to pass)

May be we discuss some aspects beter by direct email (and in Dutch
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Old 8th November 2014, 04:39 PM   #10
pguerin is offline pguerin  France
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Quote:
I'm happy to provide one of you guys a sample mono module for 50% discount (MY1-151PA) if you would test it and write about it.
Hi Mies1971 ,

I'm interrested, please PM me
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