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Post by puffin on Nov 29, 2017 9:06:53 GMT
I am an inveterate fiddler (at times). I can leave stuff alone for months and then have to fiddle. I have bi-amped speakers which means you can reverse the phase on the Mid/Treble units, and the bass if you wish but that seems to give weird results. It is interesting the effect altering Mid/Treb has on soundstage and how the music overall is presented.
You can alter the phase on both L & R or just L or R. Anyone else tried this?
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Post by Tim on Nov 29, 2017 9:59:01 GMT
I am an inveterate fiddler (at times). I think you can find a therapy group for that? |
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Post by puffin on Nov 29, 2017 10:34:47 GMT
Now then, Now then....uguhuguguhu (voice wobble)
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Post by MartinT on Nov 29, 2017 10:50:13 GMT
Some crossovers (e.g. the standard KEF design for B139, B110 and T27) invert the midrange phase to achieve the best fit of the three drivers, but I doubt very much that you would find benefit in doing so for a design not intended for it. Inverting phase in just one channel would give even more bizarre results. Then you would indeed need therapy!
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Post by puffin on Nov 29, 2017 11:51:30 GMT
If you haven't tried it IMO it is worth a couple of minutes. You might be surprised....if not you can have some of my medication.
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Post by Deleted on Nov 29, 2017 12:41:23 GMT
i used to run my speakers out of phase with the old Quad '303'..
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Post by puffin on Nov 29, 2017 13:19:56 GMT
You can run both speakers with the reds in the blacks and vice-versa or you can do what I have tried.
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Post by Deleted on Nov 29, 2017 13:22:29 GMT
I remember a bit about it in one of the old Hi-Fi For Pleasure mags from the 80's.
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Post by puffin on Nov 29, 2017 14:06:27 GMT
Yes, I think they probably referred to it as absolute phase. I never understood that term.....but I am sure someone will be along to explain it.
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Post by MartinT on Nov 29, 2017 14:09:06 GMT
It determines whether a speaker cone pushes or sucks on a transient pulse (like a drum beat).
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Post by Clive on Nov 29, 2017 15:51:46 GMT
It's probably better to call this speaker or drive unit polarity rather than phase. Using the word phase in this context can be confusing.
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Post by puffin on Nov 29, 2017 16:16:46 GMT
Ah, yes of course you are right. Can someone change the title?
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Post by ChrisB on Nov 29, 2017 21:58:01 GMT
Done!
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Post by speedysteve on Nov 30, 2017 0:16:45 GMT
Interesting experiments.
When I had 2nd order passive crossovers on the original incarnation of my 5 way system it was necessary to invert the polarity on channel 2 and 4 to obtain the best sound.
With DSP crossovers it's not really necessary, although it can be argued that all X/O's play with phase to some extent.. I've tried inverting channel 2 and 4 recently and, whilst it as you say changes the sound stage, I put it back soon after.
I use a mix of different orders.
4th order on tapped horn subs, 4th order on low frequency of mid bass but 2nd order (or is it 3rd, I forget) I'll be the higher freq, then 2nd order for mid channel and first order for upper mid and tweeter channels.
Easy to change in DSP until it sounds best.
Could never spend the time or money on caps and air core inductors in passives to try that.
Just the caps and inductors for 2nd order cost more then the entire basic Najda DSP solution!
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