I've had another look at your drawing of the crossover circuit.
Check the layout carefully against the attached basic layout of the crossover (less resistors) to make sure all your connections are in the correct place.
EDITED!
Check the layout carefully against the attached basic layout of the crossover (less resistors) to make sure all your connections are in the correct place.
EDITED!
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Your drawing needs revision.
Best remove capacitors C1 and C2 while leaving R1 in place and report back.
Best remove capacitors C1 and C2 while leaving R1 in place and report back.
Results weren't better with them removed. I'm using room correction EQ so with the EQ engaged the BM6 sound "correct" and much better with the 606 than with the integrated amp.
It's good to hear that the off the shelf crossover has your project up and running to your satisfaction.
Happy listening!
Happy listening!
Well, it "works". With room correction engaged. But tbh these crossovers from aliexpress aren't a good fit for the BM6, with no room correction the low end is too thin and the high end is too prominent. I'll have to look for BM6P eventually 😉
I hope this is helpful to anyone else attempting to convert a BM6A to a BM6P. As I read through this thread the suggested crossover schematic was never tried by the user who started the thread. I tried it and it worked flawlessly. The sound is truly sublime. I’m a huge fan of Dyns as I currently have their BM5 mk1, BM15A, and Audience 70 and have been using them for 10 years. These modified BM6A-s sound very much as they should. Anyway, here’s my findings on the crossovers.
I found close matching inductors from Hificollective and have more or less the desired resistance:
000-1357: 0.2mH Jantzen Air Core Wire Coil AWG18, 1mm diameter wire
000-2097: 1mH Jantzen Iron Core Coil AWG17, 1.2mm diameter wire
All together both crossovers came up to 130£ in parts. I used Claritycap ESA capacitors and Jantzen Superes resistors. I also used silver plated: copper wire, banana plugs, and solder.
In my tests I figured out that one has to keep the back plate of the old BM6A amps with the transformers and heat sinks. Without them being physically mounted to the speaker cabinets a lot of the low-end disappears and starts to sound a loose. I guess the extra weight and screws add rigidity and some sort of dampening to the cabinets.
Here are some pictures of the finished crossovers
I found close matching inductors from Hificollective and have more or less the desired resistance:
000-1357: 0.2mH Jantzen Air Core Wire Coil AWG18, 1mm diameter wire
000-2097: 1mH Jantzen Iron Core Coil AWG17, 1.2mm diameter wire
All together both crossovers came up to 130£ in parts. I used Claritycap ESA capacitors and Jantzen Superes resistors. I also used silver plated: copper wire, banana plugs, and solder.
In my tests I figured out that one has to keep the back plate of the old BM6A amps with the transformers and heat sinks. Without them being physically mounted to the speaker cabinets a lot of the low-end disappears and starts to sound a loose. I guess the extra weight and screws add rigidity and some sort of dampening to the cabinets.
Here are some pictures of the finished crossovers
