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Old 10th August 2008, 11:02 PM   #1
hilly is offline hilly  United Kingdom
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Default Class D for sound reinforcement rigs?

Hi, I'm new to the forum and new to class D amplifiers and hope you guys can help me out!

I have just taken over running of a music society at a university which is in need of an equipment overhaul. With regard to amplification the weight and size advantages of class D combined with SMPSs appeals very much to our storage/strength limited operation.

So, I'm looking first to build an 'all in one box' bi-amp setup for a turbosound TFM330 floor monitor which requires LF: 800 W @ 8 ohms and HF: 200 W @ 8 ohms. Module manufacturers such as Hypex, Coldamp, and CADaudio all appear to provide potentially suitable candidates but maybe there's something out there i've missed. Are there any topologies which are generally accepted as superior for higher power applications?

Anyway would be good to hear your thoughts/suggestions. What would you guys use for this application?

Cheers
Ian
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Old 11th August 2008, 01:57 PM   #2
Pafi is offline Pafi  Hungary
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Hi!

A possible solution is my home-made sub amp:

http://users.hszk.bme.hu/~sp215/fors...D%20bottom.jpg
http://users.hszk.bme.hu/~sp215/fors...%20top%202.jpg

I mentioned it only because it's just exactly what you are searching for: 800 W sin, 1200 W music power, 8 ohm (protection trips at ~5,5 ohm), power supply on board.

Other features:
- balanced input,
- 0 dB indicator,
- 2nd order LPF (150 Hz, or what you want),
- 2nd order HPF (25 Hz),
- S/N >=100 dB,
- THD<=0,2% (@ 500 W, 30-1000 Hz),
- Damping factor >=150 (@ 30-2000 Hz)
- Resonant power supply (low interference),
- efficiency at nominal power: 96 % (supply), 94 % (amplifier),
- idle power consumption: ~ 25 W.
- mass: 1,4 kg,
- dimensions: 16*26*6 cm.

Output signal at clipping (2 ms/div, 50V/div; 50 Hz, 117 Vpeak, 850 W):

http://users.hszk.bme.hu/~sp215/elektro/800W%208ohm.jpg
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Old 11th August 2008, 02:14 PM   #3
hilly is offline hilly  United Kingdom
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Thanks for the reply! Can you tell me more about the electronic design of that amp?
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Old 11th August 2008, 04:47 PM   #4
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Nice Pafi... really nice!
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Old 11th August 2008, 05:05 PM   #5
luka is offline luka  Slovenia
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Hi Pafi

As always, this amp with smps looks great, glad to hear it works as you want...
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Old 11th August 2008, 06:02 PM   #6
Pafi is offline Pafi  Hungary
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Thank you!

hilly!

What would you like to know? It's an UcD based amp, single ended, with +/-145-150 V idle supply voltage. The PSU is not stabilized, but it have short circuit protection. It's a modified LLC converter.
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Old 11th August 2008, 11:44 PM   #7
col is offline col  Australia
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How about the 41hz.com Truepath kits?

col.
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Old 18th August 2008, 11:28 PM   #8
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Hypex will have their 2kW (4 ohms) UcD modules done soon.
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