11 Channel Icepower ASX2BTL Amp Build - Page 3 - AVS Forum | Home Theater Discussions And Reviews
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post #61 of 156 Old 01-24-2016, 02:04 PM
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This is very interesting to follow along.
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post #62 of 156 Old 01-24-2016, 10:07 PM - Thread Starter
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Today I soldered all 11 XLRs and cleaned up some of the wires, but I seem to have made a grounding mistake because I am getting a ground loop hum. The chassis is grounded to mains earth, and I also connected all of the XLR pin 1s to the chassis. It hums even without signal cables attached so this can't be the issue.

The PCB has two metalized pads on the board right at the mounting bolt holes, and I assume that these are probably the issue because I used aluminum bolts. I figure switching to nylon bolts will allow the signal ground on the board to float and eliminate the hum. Any other suggestions?








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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 #63 of 156 Old 01-25-2016, 05:31 AM
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That looks great!

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RIP William Alexander
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post #64 of 156 Old 01-25-2016, 07:07 AM
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I have no idea what is causing your hum, but your work is extremely impressive.


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post #65 of 156 Old 01-26-2016, 12:28 PM - Thread Starter
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Looks like at least part of it was a foolish mistake on my part - I had one of the input wires into the wrong pin on the board connector.


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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 #66 of 156 Old 01-26-2016, 08:43 PM
 
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Glad you figured it out! Looks great!
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post #67 of 156 Old 01-27-2016, 06:32 AM
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I love this build! If I am ever in a position to spend $1500 on an amp, I would love to build one. Really nice work!
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post #68 of 156 Old 01-27-2016, 07:25 AM
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Quote:
Originally Posted by dtsdig View Post
I love this build! If I am ever in a position to spend $1500 on an amp, I would love to build one. Really nice work!
I agree. I'm dying to build an amp.


Have you tried putting speakons in the connectors? They seem awfully close together for the normal NL4FX connectors. Though I sure hope not.
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post #69 of 156 Old 01-27-2016, 01:39 PM
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Awesome work!!
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post #70 of 156 Old 01-27-2016, 06:11 PM - Thread Starter
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Thanks guys. Troubleshooting my pin error was the low point of the project because the amps were making terrible noises and I started to think I wasn't going to solve it. Thankfully after a couple hours I finally figured it out and felt pretty foolish because I had already checked the connector a dozen times.

I did the first non critical test last night of the LCR, and the sound was quite nice with no audible hiss. More on that later.

I am getting a cold so things might slow down a bit, but I did manage to solder several more patch cables.



Next I need to get the remote trigger circuit finalized - I need to be able to pull down the standby pin from +5V to ground, using the 12V output from the processor. I'm still trying to pick the right relay to do this.

Also I need to confirm the layout for the 12V aux supply and the 2x4, as well as machining the front panel for the LED backlit switch.


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7.2.4 Speakers DIYSG 1099s (LCR), Volt 10LX (SL, SR), Volt 8LX (BL, BR), Volt 10LX (TF, TR) Volt Build Link
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post #71 of 156 Old 01-28-2016, 09:31 AM - Thread Starter
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I am listening to some music this morning dragging to get out the door to work, and even with my clogged head cold everything so far is incredibly positive. I need to work on the gain level adjustment of the 2x4 and sub amp, but WOW what a difference and drastic improvement compared to my old X2000 AVR. I don't have enough of an acoustic vocabulary to express all of my excitement and superlatives, because the 7702/XT32/amp is really a radical improvement in every way. If the additional input buffer would improve things even more I would probably come to tears.

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post #72 of 156 Old 01-28-2016, 09:33 AM
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Great to hear. Sounds like you are an inspiration to others as well.

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post #73 of 156 Old 01-29-2016, 09:00 AM
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post #74 of 156 Old 02-06-2016, 02:49 PM
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Updates please... I am going through withdrawal

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post #75 of 156 Old 02-06-2016, 04:12 PM - Thread Starter
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Not much to update - I selected the remote turn on relay, along with my replacement mains power switch, and a cable raceway to help organize all of the wires behind the equipment. I should have that stuff delivered Monday. This is the relay I picked, and hopefully it will work ok. It looks like it will trigger with the 12V output from the Marantz and consume 10% of the rated current: http://www.digikey.com/product-detai...1108-ND/388945 I have a imminent order of the mono remote trigger patch cable, a 12V 10A switch mode power supply, and 250ft of 12 gauge CL2 mono price speaker wire for my new surrounds and overheads that I will start building once this amp project is ramping down.

I also removed the MiniDSP from the OEM housing and mounted it to a plate and soldered 4 XLR connectors for it, but I ran out of 4-40 nuts and need to get some more before installing it. I need to get two more XLRs connectors and about 10' more of the shielded cable for the last two channels, but I'm not in a rush because they are for future use, tentatively either for some transducers or near field subs to go behind the MLP.

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post #76 of 156 Old 02-06-2016, 04:13 PM - Thread Starter
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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
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post #77 of 156 Old 02-10-2016, 01:56 PM
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Thanks so much for documenting this. I had not thought it was possible to do a full on multichannel DIY amp and your thread, though looks like not the first DIY effort out there, is one of the more popular on AVS because of how well you documented it. The only DIY amp I remember are from ages ago when an uncle of mine built his own two channel tube amp. How the times have changed ....

So you are going to "build in" a miniDSP balanced board ... neat. Is it going to be hardwired to two of the amp channels? It looks like you are planning two ins and two outs? What are you planning on using for 12v trigger and does the amp have a power switch? How do you like that chassis that you selected? Sorry for so many questions.... You are super close to inspiring me to pull the trigger on doing a similar build (actually two).
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post #78 of 156 Old 02-10-2016, 07:53 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
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post #79 of 156 Old 02-10-2016, 08:08 PM - Thread Starter
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I got my mains AC switch, remote turn on relay, and cable raceway today. The mains switch is now in, and I will try to solder the 12V trigger wires this week. My decorative front panel push button is back ordered for a couple weeks, so i will need to work on that part later.

You can see the amount of free space left in the chassis; I am still figuring out what to do and might drop the idea of the 12V remote power supply. I picked up a cheap 12V 10A power supply from Amazon, but either I measured wrong or they didn't advertise correctly because it is a tad too big. I'm not sure if it is really worth the effort to integrate this supply or if there is a better way to use the space in this enclosure, because I realize now that I really need a couple 12V outputs and a 5V output.

I have space to park the MiniDSP unit next to the 11th channel board, which leaves me quite a bit of space near the front. Two of the MiniDSP channels will feed my Sanway amp and ported 18s, and the other two channels are TBD but I machined the back to accept enough plugs for all four outputs. It looks like I could actually fit another couple higher power boards in the front, tied right into channels 3,4 of the MiniDSP to drive some near field subs behind my couch (maybe a couple VBSS or those new DIYSG 12 driver?). If I can find boards that fit, I am thinking about leaving some space for these additional amp boards and adding three 92x17mm fans in the remaining space to help keep everything cool.

Actually the sheet metal is the only marginally hard part because you need access to the equipment and a bit of specialized know how, otherwise it is just wiring and assembly. If you surf diyA you'll see plenty of hardcore people fabricating their own boards and can find plenty of project ideas, but most seem to be making unbalanced 2 channel rigs. I am certainly happy to help anyone interested.

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Pre/Amp Marantz 7702mk2 Processor + DIY 11ch Icepower 50ASX2BTL Monoblock Amp Amp Build Link
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post #80 of 156 Old 02-11-2016, 01:42 PM - Thread Starter
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Remote turn on reed switch is ready for install!






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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 #81 of 156 Old 02-12-2016, 09:04 AM
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Keep up the good work and the pictures for those of us living vicariously through your build.

I really like the ice amps in my SC 35 and am very jealous of your newer ice modules and having enough amps in one chassis for an atmos setup
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post #82 of 156 Old 02-12-2016, 10:16 AM - Thread Starter
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Thanks I feel like I'm almost done. The remote trigger relay seems to have worked correctly based on the reduction in case temp - I don't have any indicator LEDs and didn't check functionality with a DMM. I still need to double check the current flow and verify that I am not accidentally exceeding the spec with everything ganged together.

Space wise, it looks like there is room to fit 16 channels and several internal fans using this board in this chassis. It would be a bit tight but doable.

Hopefully I can get the MiniDSP mounted and wired this weekend - I forgot to machine a USB connector on the back panel and will need to sort out some workaround.


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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 #83 of 156 Old 02-12-2016, 10:27 AM
 
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very cool
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post #84 of 156 Old 02-12-2016, 12:38 PM
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FriscoDTM,

I really like the modushop/HiFi2000 cases, especially the multihole bottom plates. I'm considering it for multichannel amp builds of my own. Did you order directly from Italy? How did that go? What's your impression with the build quality of the case, panel thickness, etc.?

I've sort of been looking at everything from this case, to the Hammond and Bud cases, Par-Metal, building my own from bar and sheet stock, custom protocase etc. I'm sure you went through that as well. Any suggestions, advice, etc.?

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post #85 of 156 Old 02-12-2016, 12:56 PM
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Quote:
Originally Posted by FriscoDTM View Post
Thanks I feel like I'm almost done. The remote trigger relay seems to have worked correctly based on the reduction in case temp - I don't have any indicator LEDs and didn't check functionality with a DMM. I still need to double check the current flow and verify that I am not accidentally exceeding the spec with everything ganged together.

Space wise, it looks like there is room to fit 16 channels and several internal fans using this board in this chassis. It would be a bit tight but doable.

Hopefully I can get the MiniDSP mounted and wired this weekend - I forgot to machine a USB connector on the back panel and will need to sort out some workaround.


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If you are not using all of the holes you machined in the back this might work for the usb issue

http://www.bhphotovideo.com/bnh/cont...Y&Q=&A=details

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post #86 of 156 Old 02-12-2016, 07:54 PM - Thread Starter
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Quote:
Originally Posted by Bigus View Post
FriscoDTM,

I really like the modushop/HiFi2000 cases, especially the multihole bottom plates. I'm considering it for multichannel amp builds of my own. Did you order directly from Italy? How did that go? What's your impression with the build quality of the case, panel thickness, etc.?

I've sort of been looking at everything from this case, to the Hammond and Bud cases, Par-Metal, building my own from bar and sheet stock, custom protocase etc. I'm sure you went through that as well. Any suggestions, advice, etc.?
I have no complaints about the case - the perforated mounting plate is very convenient, but it would be nice if they also offered smaller perforated plates for vertical mounting like I made. I opted for the 10mm front panel, and it looks nice because it is not too flimsy. There was no scratching or visible damage - packing was done very professionally and all hardware and a set of feet was included. I haven't gotten any customs bill, and with the euro exchange rate the price wasn't really different than options from Aliexpress. I would buy from them again, and if I did I might opt to have them machine the back for the Neutrik connectors to simplify things.

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 #87 of 156 Old 02-12-2016, 07:57 PM - Thread Starter
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If you are not using all of the holes you machined in the back this might work for the usb issue

http://www.bhphotovideo.com/bnh/cont...Y&Q=&A=details

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Thanks for the suggestion, but at this point all of the Neutrik connectors are spoken for. I think I will try to snake a wire through one of the small holes I drilled for the 12V connectors or just pop the top off if I need to reprogram the MiniDSP.

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 #88 of 156 Old 02-12-2016, 08:07 PM - Thread Starter
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Here's my mockup for the front panel button location - centered 1/3 from the bottom.




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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 #89 of 156 Old 02-12-2016, 10:49 PM - Thread Starter
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In prep for REW sweeps of this new setup, here are several old measurements of my 1099s driven by both a X2000 AVR and the 7702 + $13 TPA3116 unbalanced amp.










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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 #90 of 156 Old 03-03-2016, 01:50 PM - Thread Starter
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Finally after a long wait I have the front panel switch. It was back ordered, and then finally when it shipped the package was labeled wrong and ended up being lost for 2.5 weeks by USPS and finally showed back up at Digikey. It is only rated for 3A and largely decorative, so I will probably wire it in series with the 12V remote trigger and power the LED via the auxiliary output from one of the Icepower boards.



ellisr63 likes this.

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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