Hi, David
There is a slide switch located on the IO buffer board, switch it to "BRIDGE" and then you will config the amplifier in bridge mode.
While in bridge mode: the input signal comes from the CH1 input, and the output to the speaker is 1+/2+.
I hope the above will answer your question.
Thanks,Eric
There is a slide switch located on the IO buffer board, switch it to "BRIDGE" and then you will config the amplifier in bridge mode.
While in bridge mode: the input signal comes from the CH1 input, and the output to the speaker is 1+/2+.
I hope the above will answer your question.
Thanks,Eric
Finally completed my six channel version. Took a page out of Von Ah's build. I went with a 2U Pesante chassis from the store, added a Folsom filter, brought the indicator LED to the front panel and added the additional 100uf caps on the outputs that GPAPAG suggested.
Sounds very clean. I have several diy preamps that I have build that various forum members designed. I will take a listen to them and give some more feed back on this amp.
Sounds very clean. I have several diy preamps that I have build that various forum members designed. I will take a listen to them and give some more feed back on this amp.
Attachments
Hi @Erica.C
I recently joined this forum and have been hunting for a Class D board like this for a while. Can you please send me a private message so I can give additional information?
HiHello friends,
2X300W module is ready for order now, currently, it only supports the 185--265Vac input.
I welcome you PM me for more details.
Thanks,Eric
View attachment 1161150
Is there anyone who had compared this against the 2x150W version?
Any difference in sound or do they perform almost the same, just more powerfull?
L
What's offered seems amazing for the price! Definitely considering. There was a question about how this amp compares to Hypex ncore; did anyone do a detailed test comparison? Also is the 300w+150w option available on every version?
An aside: Currently I use a 4x Hypex nc252mp amp to drive my modified Linkwitz LX521. Love the amp sound but one module became intermittent. Replacing it is a pain...
Also have Rotel rkb-850 8-ch amp with Hypex ucd180 modules; also very good performance but residual hum & noise increased over time.
A bit worrisome: am I witnessing a Hypex problem or a class D problem? Two older AB amps (8ch) exhibit no apparent degradation after 10 years of use.
An aside: Currently I use a 4x Hypex nc252mp amp to drive my modified Linkwitz LX521. Love the amp sound but one module became intermittent. Replacing it is a pain...
Also have Rotel rkb-850 8-ch amp with Hypex ucd180 modules; also very good performance but residual hum & noise increased over time.
A bit worrisome: am I witnessing a Hypex problem or a class D problem? Two older AB amps (8ch) exhibit no apparent degradation after 10 years of use.
That's an interesting insight, George! I presume you refer to the Rotel & its UcD180 modules. Can you expand on that? Maybe I can examine & fix these solder points... tho with tiny surface mount components, maybe not.It sounds more like a (lead-free) solder degradation at some thermally stressed PCB area rather than an illusional Class D rot.
George
Note: I'm pretty sure the noise is not coming from the PSU in the Rotel because 6 of the channels have similar but not identical residual noise, while 2 have none of the buzzing. The primary PSU looks like a Hypex SMPS400, probably 46V out version. I was surprised there's only one to power 8 of the UcD180s. The Rotel's output rating of 50w/ch suggests the 100w/ch version (RKB-8100) simply has a bigger Hypex PSU, or maybe 2 of these SMPS400.
So the two amps I ordered arrived a few days ago (from a Canadian address!!) and I found time to rig one up temporarily. No connection for the ground of the AC cable seems a little strange. Excuse my ignorance: What should be done with the ground terminal from the IEC AC cable?
As everyone's said, the amp and input modules both look excellent, clean.
Had to hunt around for a passive speaker system as all my speaker projects in the studio are active. Using a pair of Paradigm Millenia Ones, the only passives I have on hand. Shocked the amp sounds as good as it does!
No hum, just a bit of hiss mostly from the tweeter a few inches away.
Like most buyers before me, I opted for the balanced inputs. The 32 dB gain mentioned for this seems really high! I would prefer not to have the additional 6 dB gain of this input board. Any way to change/reduce the gain?
Also, does the toggle switch function as a power switch or simply mute the input? I assume the on-board slider switch is for bridging.
As everyone's said, the amp and input modules both look excellent, clean.
Had to hunt around for a passive speaker system as all my speaker projects in the studio are active. Using a pair of Paradigm Millenia Ones, the only passives I have on hand. Shocked the amp sounds as good as it does!
No hum, just a bit of hiss mostly from the tweeter a few inches away.
Like most buyers before me, I opted for the balanced inputs. The 32 dB gain mentioned for this seems really high! I would prefer not to have the additional 6 dB gain of this input board. Any way to change/reduce the gain?
Also, does the toggle switch function as a power switch or simply mute the input? I assume the on-board slider switch is for bridging.
This post goes in to some detail about PE and ground connections:
https://www.diyaudio.com/community/threads/2x150w-amp-module-for-sale.388868/post-7215251
https://www.diyaudio.com/community/threads/2x150w-amp-module-for-sale.388868/post-7215251