11 Channel Icepower ASX2BTL Amp Build - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 156 Old 12-23-2015, 02:19 PM - Thread Starter
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11 Channel Icepower ASX2BTL Amp Build

So a couple weeks ago I picked up a Black Friday 7702mk2 processor so I could start upgrading to Atmos...



This is my first processor so I needed an amp, and I decided I to build it. I looked at Hypex, Icepower, and a variety of popular lower cost class D boards on diyA. I have now secured 11 Icepower AXS2BTL boards from eBay. Thanks to Nyt and Hypez for input.



I picked these boards because of the price to performance and integrated power supply. The boards will output 170W at 4ohm with 1%THD+N, powering my 1099s and surrounds. Distortion at 1W 4ohm is 0.002% with clean output up to around 80W. It has a S/N of 125dB and operates balanced.



More details to follow...


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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #2 of 156 Old 12-23-2015, 02:32 PM
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THIS ^ is the start of something great . . . .

the modular configurable powerhouse

did I hear somebody say 9.x.6

subbed

maybe you could reserve a few post slots and keep everything right up front and editable . ..

and thanks
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post #3 of 156 Old 12-23-2015, 02:56 PM
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Some are looking for Sub amps that don't have a restriction wrt a built in HPF or a response/driving capacity/range that can go down to say 5 Hz.

I checked the website but I can't really tell what the rated frequency range is.

This is gonna be beautiful

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post #4 of 156 Old 12-23-2015, 02:56 PM - Thread Starter
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Good idea, reserved


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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #5 of 156 Old 12-23-2015, 02:56 PM - Thread Starter
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Reserved


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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #6 of 156 Old 12-23-2015, 02:57 PM - Thread Starter
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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #7 of 156 Old 12-23-2015, 06:37 PM
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Cool project!

Are you designing your own input buffer? The Icepower amps do not perform well downstream of a volume pot without an buffered input. See http://www.diyaudio.com/forums/class...ents-mods.html

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post #8 of 156 Old 12-23-2015, 08:22 PM - Thread Starter
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I didn't think it was necessary and will start looking into the options - all links are appreciated. I have read about the LM4562 but thought those were used in other applications. The Marantz should have enough voltage to drive the amp to full power so I guess it will need to be operating at unity gain and not act as a preamp, unless I have misunderstood?


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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
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Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #9 of 156 Old 12-23-2015, 09:21 PM
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It's not about voltage, it's about impedance.

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post #10 of 156 Old 12-24-2015, 09:54 AM
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Are there any DIY amp designs available that can produce 200 or more WPC into 8 ohms into more than 5 or 7 channels? I would like to see that design allow for bridging. I would also like to see 1000 WPC 2-channel DIY amp solutions using class AB/G. But only if those designs are better or cheaper than what can be found from ID or commercially available locations.

I DO like the balanced design though.
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post #11 of 156 Old 12-24-2015, 12:27 PM
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11 Channel Icepower ASX2BTL Amp Build

Not to hijack this thread, but I had no idea you could build your own amps! Where can I find out more info about this?!?

Can you build ATMOS amps for a theater room?

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post #12 of 156 Old 12-24-2015, 12:51 PM
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You should not need a buffer on the input of these amplifiers as the Marantz essentially has that. I would start by building them as is and testing it. If it sounds good to you, don't worry about it. If you find the highs seem rolled off, you might have a mismatch and need to add the buffer. Having worked with these exact amplifier modules I did not find the problems noted in that DIYaudio post, and question both how that person measured it and what his source was. One of my own amplifier builds has PASS B1 buffers and before that a DIY HDAM style buffer. What I've generally noticed is that adding things to fix one problem often adds another problem. The HDAM was really sensitive to the power supply I used and the way I grounded them. The PASS B1 was worse. The aux power on the icepower amps might not work well to power the buffer so now you need to add a power supply (or 11) to power the 11 input buffers. You won't hurt anything to try it without, so before you go wasting a lot of time and money adding buffers, try it without. Modern equipment typically has sufficiently buffered outputs with standard output impedances that match the standard input impedance of these devices (in this case 8k ohms minimum).
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post #13 of 156 Old 12-24-2015, 12:52 PM
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honestly, skip the pots. the preamp will adjust all the appropriate levels and volume control. i've read about too many issues when using them

PM me if you have any q's, built an Icepower amp a few months back. 500asp + 500a for my subs
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Quote:
Originally Posted by Claybe View Post
Not to hijack this thread, but I had no idea you could build your own amps! Where can I find out more info about this?!?

Can you build ATMOS amps for a theater room?

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Check out this thread https://www.avsforum.com/forum/155-di...ass-d-amp.html
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post #15 of 156 Old 12-24-2015, 01:07 PM
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Quote:
Originally Posted by datrumole View Post
honestly, skip the pots. the preamp will adjust all the appropriate levels and volume control. i've read about too many issues when using them

PM me if you have any q's, built an Icepower amp a few months back. 500asp + 500a for my subs

I don't think he is adding pot's, that was just DS-21's comment.
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post #16 of 156 Old 12-24-2015, 01:18 PM
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just go over to diy audio u will find countless amps u could build and quite a few u can buy assembled

some easy amps would be

L15D i have a lot of these easy to use and they sound good, not so great for high sensitivity speakers little bit of buzz at over 100db/watt
First one on paper this amp is super good
hypex expensive their power supplys are well priced
http://connexelectronic.com/ good stuff kinda priced out with the euro tanking
sure electronics cheapest chinese crap avoid
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post #17 of 156 Old 12-24-2015, 10:33 PM - Thread Starter
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I'm still not clear that an additional buffer is necessary for this setup, and I'll reserve judgement about making a board until I can thoroughly test things. Many of the diyA guys seem to have very unique home made equipment, and while I wouldn't venture to suggest that I know better I will defer for now. The buffers discussed in the designers manual look simple enough to build, and I hopefully should have enough space in the chassis to add them if needed. But my perception from nearly everything I've read at this point is that it will not be needed, and I'll report back either way.

for anyone interested, here's some OEM info for these boards:

http://www.icepower.dk/files/solutio...5_20150709.pdf
http://www.icepower.dk/files/solutio...b_03072012.pdf

I am temporarily powering the L/R 1099s using a TPA3116 amp that I got from Yuan Jing in HK to test, powered by an old HP laptop power supply. It is a very popular <$20 2x50W board in the diyA forum, and there are dozens of different variants. I have two versions (green audiobah and blue y-j danzz), and even unmodified they both sound pretty good given the price. I also have a $20 IRS1092 200W board with one of the $20 Abletec buyout power supplies that are available right now through PE, but I haven't really used it much. These will eventually be turned into a 2.1 desk setup.

The plan of record is to stuff all 11 of the boards into a 3U Pesante 400mm aluminum case from Hifi2000 which I should have in a week. I will need to mount the boards vertically on mounting plates, and the rear panel will be machined to accept XLRs, speakons, and several 12V connectors. I will do a remote trigger and still need to decide about front panel indicator LEDs.

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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #18 of 156 Old 12-25-2015, 10:43 AM
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This could be really really cool, a DIY 11 channel amp would be great.

Sub'd!!!
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post #19 of 156 Old 12-25-2015, 10:32 PM - Thread Starter
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Ordered some of the connectors, shielded wire, and related parts from Redco. I picked up a couple extra XLR connectors in case I can integrate the 2x4 DSP sub unit into the amp housing. I still need to pick up the IEC power connector, parts for the remote on/off trigger, and other items from Digikey.



For ease of construction, I also picked up pre-fab cable sets from Ghent: http://ghentaudio.com/cable/50asx2.html

And the chassis, using the alternate cover with 10 rows of vent holes: http://www.modushop.biz/site/index.p...product_id=168
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Display 2013 Samsung 75" UN75F6300 TV Media Xbox One X, Dune Solo, QNAP TS-453A NAS
Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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Chassis is here






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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #21 of 156 Old 01-05-2016, 06:58 PM - Thread Starter
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XLRs and speakon parts are in from Redco, along with prefab wire harnesses from Ghent. 1.5mm Al sheet stock from Grainger will be picked up tomorrow and machining should start.



Remaining electronics bits should be on order from Digikey by the end of the week, and I will post the tentative order list once finalized because I have a couple questions.


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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
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Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #22 of 156 Old 01-07-2016, 06:50 PM - Thread Starter
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I picked up six 4x10" 1.5mm thick Al plates to mount the PCBs on from Grainger, and I punched the mounting holes today. Each plate will hold two boards and be folded so that they can be mounted to he chassis base plate. A couple of the plates deformed slightly and needed to be hammered flat, using what turns out to be an old rail road track from the UK.






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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #23 of 156 Old 01-08-2016, 09:36 AM
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Sub'd




My next upgrade will be an amp... building one sound like fun.
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post #24 of 156 Old 01-08-2016, 05:15 PM - Thread Starter
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The PCB mounting plates have been angled, and the first PCB test fit looks ok.






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post #25 of 156 Old 01-08-2016, 05:38 PM
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It's always inspiring to see someone take on a DIY project of this depth. Having to fabricate many of the parts is a big deal; good on you for taking on the challenge! I'll be lurking and checking out all the pics! Good luck!
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post #26 of 156 Old 01-09-2016, 09:09 AM
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Really cool! I am definitely going to be following this thread! Thanks for sharing!

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post #27 of 156 Old 01-09-2016, 11:29 AM - Thread Starter
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thanks it's a fun project, but it is my first electronics project and I am learning as I go along. Like anything, it's a lot easier having a good support network and access to the right tools and resources. Once I finish mounting all of the boards to the base plate, I will start to machine the front and back panels, and then I'll work on the wiring and hopefully should be done within 2-4 weeks.

I still haven't ordered the remaining electronic parts from Digikey, and it is a bit overwhelming because there are so many product options. For power distribution, I'm tentatively planning to use a min-DIN rail terminal block for power connections at the recommendation of a work colleague. It looks like this will cost ~$50 in parts but will look very professional and should be safe. Phoenix Contact

I want to add a remote trigger to turn the amps on, coupling the 12V remote trigger output from the 7702 to a standby/enable pin on each PCB. The PCB pin is normally hot at +5V, and the amp will be put into mute/standby if this signal is pulled to ground. So I think that means that I can gang together all of these signals onto a bus and connect them to a normally closed 12V relay. That way when the 7702 is off, the 5V standby pin will be pulled to ground and disable the amps and allow them to all turn on when the relay gets a 12V signal. I'm still working through this part and any suggestions are appreciated.

I want to add something to the front panel, and at this point I'm planning to have a single indicator button with a LED backlight. Digikey has a switch like this for ~$12, but they're only rated for 3A so I will probably wire it to the remote trigger circuit. E-Switch

I picked up a couple extra XLRs to see if I could fit my MiniDSP 2x4 into the housing, as well as possibly adding a 12V switch mode supply so I can eliminate 3-4 12V transformer plugs from the wall. It looks like there's plenty of space to fit these but I will need to confirm once all of the boards are in...

Display 2013 Samsung 75" UN75F6300 TV Media Xbox One X, Dune Solo, QNAP TS-453A NAS
Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #28 of 156 Old 01-09-2016, 05:21 PM - Thread Starter
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Baby steps




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Display 2013 Samsung 75" UN75F6300 TV Media Xbox One X, Dune Solo, QNAP TS-453A NAS
Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #29 of 156 Old 01-09-2016, 05:39 PM - Thread Starter
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And a first pass at a layout - looks like enough space to add the other components, a 2x4 and a 12V supply




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Display 2013 Samsung 75" UN75F6300 TV Media Xbox One X, Dune Solo, QNAP TS-453A NAS
Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
Subs Dual 19Hz DIY Ported UXL-18s + FP14k Amp + MiniDSP 2x4 Balanced Tactile Crowsons + iNuke 6000DSP
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post #30 of 156 Old 01-10-2016, 05:34 AM
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Looks good!

Have you given any though to wiring layout? I am no expert but I would assume running speaker outputs and supply lines next to each other is a no no.

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