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Class D Switching Power Amplifiers and Power D/A conversion

The New Hypex Fusion Plate amps
The New Hypex Fusion Plate amps
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Old 17th February 2019, 09:11 PM   #1151
Flossie is offline Flossie  United Kingdom
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Join Date: Oct 2016
Originally Posted by curator17 View Post
I am planing to create a full active surround system with these amps. To be fully active I would like to use a 3-way model for both front speakers and 2-way models for center and rears.

My question is how to send data to the amplifiers? I could use some source with RCA out and bring the Mono Signal to each amp independently. Howver, I would prefer to use the digital input in order to reduce DA/AD conversions.

As I understood, I could use a master / slave connection, connecting Digital Through of Master with Digital Input of Slave and use loudness control of the master amp (the slave adjusts to this setting?).

But what about the rear pair e.g.? The might be connected to each other identically, but I would have to adjust volume for front and rear seperatly? I dont think that a nice solution.

Finally, I have not found a possibility to adjust level in the source, or are there any (digial) solutions?

I don't think you have many options at the consumer level, other than to use an AV processor and take balanced/line level analogue out for each channel separately, and accept that there will be further A-D and D-A in the Fusion amp.

There are probably professional products out there that will take a multi-channel AV digital input, process it and output each of the channels as PCM digital, but I'm not aware of any consumer-level ones that do.

Even then, setting up levels and delays for each channel in each individual Fusion amp would be a pain compared to setting up for your normal listening position in an AV processor, so I can't see there being any demand in the short term for a solution like that.

In the longer term when (if) active speaker systems with digital inputs become more "normal", perhaps consumer-level AV products will include the feature.
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Old 18th February 2019, 03:43 AM   #1152
denibeni is online now denibeni
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I agree with what was written before.
I think it's worth a further A/D-D/A conversion to make life easier with analog inputs if you have a quality analog source in front of the Fusionamps.

Last edited by denibeni; 18th February 2019 at 03:59 AM.
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Old 18th February 2019, 07:38 AM   #1153
curator17 is offline curator17
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Hi, thanks for your posts.

Assuming to use the line input of the amps, I would have to add a 5m Chinch cable along with with the power supply (might cause interferences) or chose a network solution.

For the latter I would add a RPi with DAC Header for each stereo pair and doing level control via software connection. I'm not sure if this works for delay as well. However,

since the leaves the discussion of the FA amps, can one give advise where to move this discussion? I will then crosslink.

Thanks again
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Old 19th February 2019, 10:15 AM   #1154
TimbreAudio is offline TimbreAudio  United Kingdom
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Have you looked at WISA?

StreamUnlimited can make modules, and I believe there are a few on the market, with some receivers now outputting surround sound.

You may be one of the first to have a true, active dsp, wireless system!

Just to check you are planning on using a single plate amp in each speaker?
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Old 20th February 2019, 07:40 AM   #1155
curator17 is offline curator17
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Dont know them yet, interessing keywords, thanks for sharing.

However, we are in a DIY forum ....

You got me right: One plate for each speaker
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Old 20th February 2019, 05:37 PM   #1156
TimbreAudio is offline TimbreAudio  United Kingdom
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Here is the company that Stream Unlimited said was making WISA modules. Would these work for digital connectivity?

almando Multiplay Surround Switch (Powerlink / Digital Audiolink / Bluetooth / SPDIF / optional: WISA) - Multiplay Surround Switch - almando
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Old 22nd February 2019, 06:19 AM   #1157
alex6679 is offline alex6679  Austria
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I am in a similar situation regarding a surround setup with digital active speaker. I am currently building a digital preprocessor with volume control based on the freedsp project. It will consist of an Arduino (with a display, rotary encoder,...) that controls the freedsp over i2c.

I am using four of this moduls to get spdif outputs:
Digitale Interface I2S vers SPDIF BNC WM8804 - Audiophonics

and four of the freedsp classic spdif/AES input moduls:
freeDSPx AES:SPDIF IN - Google Docs

However I had to slightly modify the freedsp smd B to get the i2s inputs working. Additionally I changed one resistor of the digital input moduls to set them into i2s slave mode.

Another possibilty would mayby be the minidsp DDRC-88D:
DDRC-88D All Digital Digital Room Correction powered by Dirac Live
It's meant for room correction but also implements a 8 channel volume control.

Best regards
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Old 22nd February 2019, 07:11 PM   #1158
Ianmac is offline Ianmac  Scotland
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Originally Posted by DannerD3H View Post
You can find my step-by-step guide here:
Setting up a Fusion Amp 3-way Step-by-Step

Hope it helps more than it confuses!

Let me know if I forgot something or made amistake somewhere!
Im working through this and it helps me but still need info on using a mike to measure speaker response using the Hypex software. Most seem to use REW.

I have corrected my error, in ignorance of the Hypex software/system requirements, of purchasing a Scarlet 2i2, now sold. I have bought the recommended Berhinger UMC22 and a Berhinger ECM 8000 mike. Hopefully a futher step towards purchasing a fusion.
I am a little surprised to find that no one has commented on the environment used to set up an active system. From my reading I find one has to use " Free Space " or an appropriate echo free chamber. To this end it means I have to use my speaker in my Garden with it as far above ground level as possible.
How have all who are using Fusion amps completed their final speaker line up -- In their domestic listening rooms -- or am I missing something?
Advice gratefully appreciated.
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Old 24th February 2019, 05:49 AM   #1159
yoke is offline yoke  Croatia
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Hi, have one question for those who use FA253 or similar...

But it's general question...

Do you use protection capacitor on tweeter connected to nc100hf ?

Or do you use directed connection from amplifier to the tweeter ?

I have read, some place, that people are useing large capacitor in series with tweeter, but some people dont use it if amplifier have dc protection ?

Does nc100hf have DC protection and can we assume it will do the job ?

(I have satori beryllium tweeter which is like 96db sensitivity )
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Old 24th February 2019, 08:23 AM   #1160
cowanaudio is offline cowanaudio  Australia
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The New Hypex Fusion Plate amps
I direct connect into BMS 4552 compression drivers with no problems. The amps make no worrying sounds.
Don't Procrastinate....Just Do It!
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