Electrical interference questions for speaker cable and adjacent subwoofer power cord

@michiganbuckeye, after looking at the specs and descriptions of the M32 and the HINT 6 (not "INT6") I see no particular technical issues related to them that would significantly favor one of the two scenarios you cited vs. the other. So IMO the overriding consideration in choosing between those scenarios, assuming that you separate the cables by a few inches as has been suggested, is the performance of the speaker with the sub amp built in vs. not built in.  And as you indicated Ohm should be consulted on that question, especially given that the Ohm F-5015 is apparently still in beta test mode.

Also, a minor point: It would be best to refer to the M32 and HINT 6 as "integrated amplifiers." Referring to them as "receivers" might be misleading to some people.

And regarding shielded power cords, FWIW I've had fine results using Signal Cable Magic Power Digital Reference double-shielded 12 gauge power cords on two different high quality power amplifiers (a tube-based VAC Renaissance 70/70 MkIII and a solid state Pass XA25). Albeit amplifiers that are significantly less powerful than the M32 or HINT 6, and that in contrast to the M32 and HINT 6 operate in class A and hence do not draw amounts of current that fluctuate widely with the dynamics of the music. (Those power cords are ostensibly intended for use with digital components, but their gauge was/is adequate for use with my amps and I wanted the shielding they provide because they are routed near my phono stage). Of course, such things tend to be very component and system dependent, so YMMV.

Finally, if I may say so, kudos on the excellent composition of your posts and questions.

Regards,
-- Al
 

While as others have said I doubt that any EMI (electromagnetic interference) that may couple from the power cords of the sub amps to the main speaker cables would be strong enough to cause a response by the speakers themselves, from a technical standpoint it is conceivable (to me) that it might have at least subtle sonic effects on the main parts of the speakers by entering the feedback loop of the main amplifier (if the amp has a feedback loop), that amp apparently being in the receiver you mentioned. And in that regard it should be kept in mind that coupling of frequencies that are much higher than 60 Hz may occur, including spectral components associated with abrupt changes in demands for current by the sub, as well as harmonics and RFI that may be present on the incoming AC.

Any such effects would be dependent on the design of the specific amp/receiver, and would have little or no predictability.

Also, I wouldn't rule out the possibility that if the signal cable to the sub and the sub's power cord are closely spaced a low level hum could be induced in the sub.

So I would follow the suggestions offered above of providing at least three inches of spacing between the power cord and the signal cables. Or else use a shielded power cord, as was also suggested.

Also, regarding ...

b) subwoofer speaker cable from main driver speaker cable)?

It isn't clear to me from your post if the sub amps are to be driven by speaker-level signals (i.e., by the same signals that are provided to the main parts of the speakers), or by line-level signals from outputs of the preamp section of the receiver you mentioned. If the latter it would probably increase the importance of providing some separation between those cables, depending on the effectiveness of the shielding provided by the line-level cables.  If the former, why not run just one set of speaker cables, and connect from the terminals of the main parts of the speakers to the inputs of the sub amps?

Finally, regarding question 5, an obvious concern if the sub amp is located within the speaker would be the effects of vibration on it. Whether and to what degree that might be a problem depends on the specific design, of course.

Good luck with your project. Regards,
-- Al