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I hope to soon be ordering a pair of Avantgarde Duo speakers. The latest SUB 225 subwoofers do not include a phase switch. I contacted Herr Fromme at AG and he wrote:-'The phase switch in the older models has been replaced by switchable subsonic filter. The 3-position subsonic-switch allows you to limit the bass response to 20 Hz, 25 Hz or 30 Hz. The system is normally operated in the 20 Hz position. Although the phase switch is no longer available, you will have the same functionality, by simply reverting (sic) the phase on the input terminals of the subwoofer module'.
I was under the impression that swapping across the input terminals would reverse polarity, and that phase and polarity are not the same thing. Have I got that wrong?
From your experience with using AG speakers, do you consider the omission of a phase switch on the subs to be a possible limitation? I know that altering the phase setting on the REL sub in my current set up makes a significant difference to bass integration.
Thanks for your help.
Jeremy B
..... or ladies, if any of your monikers are concealing gender.Jeremy
You should test polarity of you subs (which most probably will be inverted) and then match it with phase of the horns. (It easy to do by 160 Hz test) Then test the absolute polarity your system and it you need shift it at the DAC/preamp level. Have fan.
I have the new Duos that you describe, the first one to come into the US according to Jim Smith, and I like the setup. My Joule Electra pre inverts polarity so I deal with it by flip-flopping the speaker cables. The filter works great but I normally use it in the 20 Hz position, as it gives the music more body. I haven't experienced any limitations with this setup yet. The only downside of the AG is that they can be very sensitive to hum, you will really be able to tell what your equipment is doing, although, not always to your pleasure. ;-)Nirvana cable works great with the Duos, and definately connect your amp to the mid-range horn with bananas and jump it from the midrange to the tweeter to the woofer with really good cable and dump the stock jumpers, which don't really sound that great. The guys at Nirvana will make you a custom wiring harness for it on the inexpensive side, and I highly recommend it.Good luck!
Jeff
> > > 'The phase switch in the older models has been replaced by switchable subsonic filter. The 3-position subsonic-switch allows you to limit the bass response to 20 Hz, 25 Hz or 30 Hz. The system is normally operated in the 20 Hz position. Although the phase switch is no longer available, you will have the same functionality, by simply reverting (sic) the phase on the input terminals of the subwoofer module'. < < <This is a cool added feature and one I wished I had!
> > > I was under the impression that swapping across the input terminals would reverse polarity, and that phase and polarity are not the same thing. Have I got that wrong? < < <
All the phase switch offered was a 180 degree phase change, exactly the same as reversing polarity on the speaker input. It is actually a redundant feature to have a phase polarity switch. That's why it's better to dump that and have a more useful subsonic filter.
> > > From your experience with using AG speakers, do you consider the omission of a phase switch on the subs to be a possible limitation? < < <Absolutely not. You're getting more, and are not being limited in any way EXCEPT for the MINOR convenience of quickly flipping polarity with a switch rather than swap connection leads to hear the change. I actually felt the polarity switch to be a little silly since it doesn't offer any real usefulness.
Kurt
Reversed polarity is the same as a phase shift of 180 degrees. So he's correct if the phase shift you want is 180 degrees. For phase shifts not equal to 180 degrees wire reversal will not work.drobo
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