8 channels Class D amplifier for active speakers

GiAnt1961

Member
2014-03-23 10:41 am
Rome
Dear all,
I would like to build a Class D 8 channel amplifier for my new DIY 4 way active speakers.

Loudspeaker units are:


SUB: Dayton Titanic 12" MKIII
Power Handling (RMS)500 Watts
Power Handling (max)1000 Watts
Impedance 4 ohms
Sensitivity86 dB 1W/1m

LOW VOICE: Wavecor SW215WA01
Nominal impedance 4 Ohm
Sensitivity, 2.83V/1m 89 dB
Power handling, long term, IEC 268-5, no additional filtering 400W
Power handling, continuous, IEC 268-5, no additional filtering 150 W


MID VOICE: Bohlender Graebener Neo10 Planar Transducer
Imp - 8 ohm
SPL - 92 dB
PH - long term 100W

High Voice SEAS 27TDFC
Nominal Impedance 6 Ohms
Short Term Power Handling * 220 W
Long Term Power Handling * 90 W
Sensitivity (2.83V, 1m) 90 dB

My working hypothesis:


One 2 x 500Watt Class D Audio Amplifier Board -IRS2092 for SUBs
http://store3.sure-e...r-board-irs2092

One 2 x 250Watt Class D Audio Amplifier Board - IRS2092 for LOW Voices
http://store3.sure-e...rd-irs2092-1601

One 4 x 100 Watt Class D Audio Amplifier Board - STA508 for both MID and HIGH voices
http://store3.sure-e...er-board-sta508

Unfortunately I have no technical expertise to correctly arrange it (power supply, case, etc). Therefore, any advice helping me in building the amplifier will be greatly appreciated.


Giant1961
 

GiAnt1961

Member
2014-03-23 10:41 am
Rome
Perhaps a bunch of these and matching power supplies:

Yuan Jing Audio - IRS2092 Class-D Mono Amplifier Board [200W] - USD $29.80 - Class-D & T

Another alternative to those Sure boards, with integrated PSU:

Connexelectronic

Both Hypex and miniDSP have multichannel plate amps too with built-in DSP crossovers.

Hi InOtIn,
above all, many many thanks for the reply.
I see you proposed me alternative brands to Sure Electronics.
Is there a reason to avoid Sure boards? Or simply you informed me about similar products worth of interest?. If boards better than Sure are marketed, pleas let me know. I know that Hypex and ICEpower manufacture excellent modules, but the first are too much expensive and the second are sold only to companies. Connexelectronic and ClassDAudio may represent a compromise/middle course? What about Sure? Deserving cheap brand exist?
Some years ago I read enthusiastic comments about the IRS2092 amplifier and looking for a manufacturer of IRS2092-based board I chanced upon Sure, also selling a 4X board very useful for my 8 channels system. Have us actually more efficient and audiophile grade amplifier?
Being unfamiliar with class D amplifier, but at the same time wishful to test myself with this challenge (after years spent to build loudspeakers), I would very grateful to you to have a kind of comprehensive "shopping list" in order to assemble a possibly affordable (and easy to build) amplifier (e.g. compatible Power supply, additional boards, capacitors etc). With such a list and sufficient instructions to assemble the whole works I would be very proud to build my own amplifier!

Cheers!

PS: DSP is not required being the system entirely managed by the PC (FIR filters-DRC)
 
I think you are on the right track.

For subs, I have heard great things about the LJM IRS2092. If you really need 500 watts then maybe:
LJM IRS2092 Stereo Amplifier board IRAUDAMP7S L15DX2 125W 500W High end Class D d7-in Other Electrical Equipment from Electrical Equipment & Supplies on Aliexpress.com | Alibaba Group

I think 250w is probably enough:
Hifi store NEW DIY KIT LJM L20D IRS2092 Top Class D amplifier Kit 200 250W *2 8ohm-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

I am using this 200W and think it sounds quite good - very low distortion:
YJ IRS2092 amplifier board +/ 50VDC Class D 1.0 channel mono IRFI4019 + IRS2092 amplifier 200W-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

For Low Voice:
http://www.aliexpress.com/item/Hifi-store-NEW-DIY-KIT-LJM-L20D-IRS2092-Top-Class-D-amplifier-Kit-200-250W-2/32245312581.html

or

http://www.aliexpress.com/item/30-60VDC-IRS2092-IRFI4019-mono-amplifier-board-200W/1856499990.html

For high voice YJ TDA7498 or Sanwu 3118 PBTL monoblocks:
Excellent Quality TDA7498 100W+100W Class D Amplifier Board High Power Amplifier Board Hot Sale Easy To Install-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

TPA3118 PBTL Mono Digital Amplifier Board 1X60W 12V 24V POWER AMP-in Other Electronic Components from Electronic Components & Supplies on Aliexpress.com | Alibaba Group (change gain to 26dB with two resistor swaps - see thread)

Although, lately I have been playing with Dx (class AB) and it sounds great for mids and bass if 100w is enough for you. Highs are excellent too - but you did say you wanted to get away from class AB. These are fairly compact and run cool.

http://www.aliexpress.com/item/2pcs-100W-100W-DIYAudio-destroyer-X-DXAMP-Amplifier-kit/654085678.html
 

GiAnt1961

Member
2014-03-23 10:41 am
Rome
I think you are on the right track.

For subs, I have heard great things about the LJM IRS2092. If you really need 500 watts then maybe:
LJM IRS2092 Stereo Amplifier board IRAUDAMP7S L15DX2 125W 500W High end Class D d7-in Other Electrical Equipment from Electrical Equipment & Supplies on Aliexpress.com | Alibaba Group

I think 250w is probably enough:
Hifi store NEW DIY KIT LJM L20D IRS2092 Top Class D amplifier Kit 200 250W *2 8ohm-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

I am using this 200W and think it sounds quite good - very low distortion:
YJ IRS2092 amplifier board +/ 50VDC Class D 1.0 channel mono IRFI4019 + IRS2092 amplifier 200W-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

For Low Voice:
http://www.aliexpress.com/item/Hifi-store-NEW-DIY-KIT-LJM-L20D-IRS2092-Top-Class-D-amplifier-Kit-200-250W-2/32245312581.html

or

http://www.aliexpress.com/item/30-60VDC-IRS2092-IRFI4019-mono-amplifier-board-200W/1856499990.html

For high voice YJ TDA7498 or Sanwu 3118 PBTL monoblocks:
Excellent Quality TDA7498 100W+100W Class D Amplifier Board High Power Amplifier Board Hot Sale Easy To Install-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

TPA3118 PBTL Mono Digital Amplifier Board 1X60W 12V 24V POWER AMP-in Other Electronic Components from Electronic Components & Supplies on Aliexpress.com | Alibaba Group (change gain to 26dB with two resistor swaps - see thread)

Although, lately I have been playing with Dx (class AB) and it sounds great for mids and bass if 100w is enough for you. Highs are excellent too - but you did say you wanted to get away from class AB. These are fairly compact and run cool.

http://www.aliexpress.com/item/2pcs-100W-100W-DIYAudio-destroyer-X-DXAMP-Amplifier-kit/654085678.html

Hi xrk971,
many thanks for the useful and detailed infos.
Only few other questions before to send the order:
1. Is LJM-L20D-IRS2092 suitable for 4 ohm speakers also (such as my sub and woofer)?
2. Do you know a trustworthy seller of assembled L20D?
3. May the SMPS800RE from connexelectronic be a good choice for two IRAUDAMP7 L20D boards? Do you know other noteworthy (and possibly cheaper) alternatives to this PSU?
4. This board Qualit eccellente tda7498 100 w + 100 w amplificatore in classe d consiglio high power amplifier consiglio vendita calda facile da installare in New PROLINK 2.1A Charging Data Cable Double Sided Contant Design High compatibility Dual Face Android Mi appears as a good choice for both mid and high voices but: are external components required or it is ready to use? What PSU you recommend for it?
5. speaker protection boards are required with these amps? If yes, what is your advice? One of these Yuan Jing Audio - Speaker Protection Board might be OK?