ICEpower 50ASX – SE to BTL conversion

I’ve recieved a few questions (and participated in a diyaudio discussion thread) about converting ICEpower 50ASX2 SE modules (which are fairly easy to get), into 50ASX BTL modules (which aren’t). I was pretty sure this could be done without component substitutions by simply desoldering the W401 jumper and resoldering it into the W400 position (marked BTL on the bottom of the board) but as I had no modules left, I couldn’t try it. Now I’ve managed to get my hands on some more modules and I’ve actually tried converting one of them and the good news are – I think it works!

I haven’t actually measured anything (not sure what to measure to be honest) but I get clean audio out on the BTL speaker connector (P104) and a very loud buzzing noise on the other output, so at least it isn’t running stereo anymore. No guarantees on anything yet though, but it’s definitely promising.

Oh, and don’t laugh at my improvised test setup, it is necessary because I don’t have a proper balanced source in the house at the moment and I couldn’t be bothered to crimp new cables just for testing 🙂 Incidentally, don’t laugh at the poor picture either – winter in Scandinavia means the days are so short that I can only take pictures in daylight during the weekend…

Next up is to convert a second module, build some better cables and try it “for real” in a stereo setup – hopefully this weekend 🙂



7 Responses to ICEpower 50ASX – SE to BTL conversion

  1. Benny says:

    This is awesome news, thanks for posting. I’ve been scattering for a btl version for 6 month now, but no luck.
    Not even GhentAudio knows where to buy it 😳 and they sell a kit just for it.

    I guess you’ll have to measure som current and voltage to establish wether it works or not. Before and after a conversion, into the same load at the same “volume” for both of them.

    I’ll be watching your work 💪🏼👍🏼

  2. Daniel says:

    ill be watching too.
    i search a 2nd btl module…for nearly a year!
    LD Systems wants over 200 Euros for this! Its inside the Stinger 8
    at this price i get a 125 ASX from Icepower on a plate (miniDSP PWR-ICE125WD)

  3. Bryan says:

    Love the Blog!! I’ve been trying to convert my 50asx2 to a blt.. Looking at your pics you just have the one channel hooked up.. From my testing and research after doing the jumper swap don’t we have to take the positive from the active channel #1and use the negative from the the muted channel #2..

    • theslowdiyer says:

      Hi Bryan, thanks for the comment. If you were bridging two independent amplifier channels then that is how you would do it. However, the 50ASX has two channels on the board and the amplifier is prepared for BTL usage so the connection are set up to be a bit “simpler” 🙂

  4. Martin says:

    I have so far built two stereo sets using SE to BTL converted modules. To my ears it works perfectly, driving a set of Piega C8 Ltd.
    The first set is unbalanced and uses the ‘1 channel’ version of in each mono-block.
    The second set uses the balanced output from an Audiolab M-DAC directly without any input buffering. That’s running in my current setup and I can’t complain.

    I read somewhere that I can bypass the anti-aliasing filter and DC blocking capacitor on the input to smooth out the input impedance and possibly improve sound quality. Do you have any experience doing that and if so, can you provide me with instructions on how to do it?

    Thanks a lot for keeping your blog alive despite being busy working and moving and stuff. It wasn’t until you stepped in and resoldered the BTL jumper, that I felt ready to attempt the same.

    • theslowdiyer says:

      Thanks Martin. I will resume posting here again on a more regular basis, it’s just taking a bit longer than I had expected 🙂

      I have no experience with modifying other aspects of the 50ASX, so unfortunately I can’t really be of much help. I would also personally be a bit hesitant to do this without a schematic, but you might be able to find someone on e.g. with more nerve than I have 😀

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