Crossover won't be hugely affected. Some nonlinearity of frequency response but not maarked. The area of concern is the bass resonance - particularly with bass reflex cabinets.
You could easily get a 6db difference at some frequencies.
Of course if its a bunch of s**te suround sound system with a separate subwoofer, then fine. You can be less critical on the higher frequency stuff...
OK so for a typical 28AWG strand of ribbon you have ~240ohms/km max resistance. That's 2.4 ohms for a 10m length.
Now take a typical 20 strand ribbon split to 10 strands for each side of the connection - 10 strands of 2.4ohms in parallel gives you a resistance of
0.24 ohms.This is approx the same as 10m of 0.75mm2 round cable. Not that bad, really. Not good, but adequate.
If you want audiophile quality then yes, you do need much bigger (and shorter) cables, but for normal home music or surround speakers that's fine.
this is immaterial. The voice coil R of around 6 ohms limits the amp's ability to apply damping. It limits it by making the R of the damping circuit 6 ohms in fact.
Picture the voice coil as an ideal driver with 6 ohms in series.
sometimes. Not in this case, not unless youre playing with 1930s kit anyway. A 2kohm speaker connected direct to B+ can be.
But this is meaningless. Its a tech spec used for marketing, not something that cna actually be applied to the speaker IRL.
Secondly speakers are not normally designed to be fully damped, resonance is deliberately used to extend the bass freq response a little lower.
NT
Apart from the fact that .75mm2 I don't consider anything like big enough for speaker cable all those paralleled up cores will have significantly more capacitance and with a nice big inductance on the end...
All I can say is that changing speaker cables from .75mm2 to 2.5mm2 made a very noticeable difference to the LF, it became tighter and less "woffly". These cables where only about 8' long as well.
And I mean a real noticeable difference, not a "green pen" difference.
Under the right conditions and depending on filters in the speaker and amplifier design, this setup can pick up short wave nicely.
Your understanding is incorrect, but I can't be arsed to pursue this further.
double blind or uncontrolled? Theres a lot of history on all this, its well studied and documented.
NT
Uncontrolled, listened to some stuff, changed the cables listened to the same stuff, easyly detectable difference. Hence my use of "not a "green pen" difference" but no doubt as it wasn't double blind you'll call me liar, so FOAD.
Definitely.
It's even theoretically predictable.
I've done tests with a variable output impedance power amplifier coupled to open backed loudspeakers for guitar use, and boy can you tell the difference between current drive and voltage drive...
Admittedly this is an extreme case, but even small differences are distinctly audible.
It's a long time ago, but IIRC it sounds most notceable on bass reflex, open backed or labyrinth type speakers. Its not so bad on infinite baffle sealed enclosures.
why would i do that?
I'm charmed. If you read up about it... no, I said that before.
NT
I'm all ears
of course, theyre very different. In another ball park entirely to minimal change in drive R.
I'm qualified in electronics, have designed amps, admittedly a while ago now, read up about the problems with such uncontrolled tests, designed some novel amp technology, and read some of the articles on the questions you raise.
is significant I am led to think he lacks awareness of the issues with such tests. Your earlier claim that cable R is effectively in series with the voice coil R is incorrect does not reassure either. But I await with interest the maths that shows that a 2% R delta has a detectable effect.
I fully accept you think a and I think b, its no big deal for me, but I'm not at all convinced by whats been said. I'll be quite happy to be shown wrong. It wouldnt be the first time.
NT
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