Hi everyone, I know there's an old thread on this but I will be converting a pair of BM6A into passive speakers and I want to reopen the topic. Much appreciated for the drawn schematic of the BM6 crossover in the previous thread.
I got a pair of BM6A, both MK1 but different revisions. Their amps are blown and butchered for parts. Fixing the amps will be more of a long-term thing. My idea is to make the speakers passive and experiment with filling the empty amp cavities with sand as they are insulated from the speaker drivers. Some sort of mass loading, I suppose, to replace the missing mass from the amps.
I’m a huge fan of Dynaudio. I own a pair of BM15A, BM5 MK1, Audience 70 and now these BM6A. All from a similar age (late 90s, early 00s). Out of curiosity I tried using the BM5 crossovers (2.7kHz) in the BM6A and their low-end was very poor. I was surprised because they both use visually identical woofers, 28mm soft dome tweeters from the same era, and similar internal cabinet volume. I figured it wouldn’t hurt to try.
Anyway, I hope the schematic suggested here will work fine. My assumption to why the passive BA6 crosses at 3.1kHz and not at 2.2kHz like the active version is that the latter has steeper slopes (4th order?). I suppose that would require more components in the signal path of a passive speaker, it would be pricier to manufacture, and harder to make accurate. Am I wrong? Can anyone suggest a crossover schematic at 2.2kHz and if not - are there any specific reason why it should be kept at 3.1kHz?
I got a pair of BM6A, both MK1 but different revisions. Their amps are blown and butchered for parts. Fixing the amps will be more of a long-term thing. My idea is to make the speakers passive and experiment with filling the empty amp cavities with sand as they are insulated from the speaker drivers. Some sort of mass loading, I suppose, to replace the missing mass from the amps.
I’m a huge fan of Dynaudio. I own a pair of BM15A, BM5 MK1, Audience 70 and now these BM6A. All from a similar age (late 90s, early 00s). Out of curiosity I tried using the BM5 crossovers (2.7kHz) in the BM6A and their low-end was very poor. I was surprised because they both use visually identical woofers, 28mm soft dome tweeters from the same era, and similar internal cabinet volume. I figured it wouldn’t hurt to try.
Anyway, I hope the schematic suggested here will work fine. My assumption to why the passive BA6 crosses at 3.1kHz and not at 2.2kHz like the active version is that the latter has steeper slopes (4th order?). I suppose that would require more components in the signal path of a passive speaker, it would be pricier to manufacture, and harder to make accurate. Am I wrong? Can anyone suggest a crossover schematic at 2.2kHz and if not - are there any specific reason why it should be kept at 3.1kHz?
