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In Reply to: RE: Maggies and acoustic panels posted by steven d on May 27, 2016 at 13:02:17
Looks very interesting. Good ideas all round.
Are those OB subwoofers?
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Thanks, it's frustrating being limited to how much I'm able to treat the space. The few thing I've done have made music more enjoyable to listen to.
The subs are isobaric, not OB. OB was what I really wanted to do but just don't have the space for four 15s per side :). These use 8" drivers and are ported; currently crossed at 30hz LR2 and just barely detectable by ear, but what they do for stabilizing the sound stage and giving a foundation to the major instrumentation and vocals is quite nice.
Opinions don't affect facts. But facts should affect opinions, and do, if you're rational..
- Ricky Gervais, 2012
Ahh Isobaric subs. How cool. My first meet with IsoBs was the KEF 104.2 and that was such a shock it brought tears to my eyes. Made my then JBL Centuries sound like they were stuffed with sheep.
I used my Vandy 2C carcasses to make bipole sealed subs by replacing the 8" woofer with an Aura 8" driver and the 10" with an Aura RPM 10 car sub driver that used to be popular in the blast off competition circuit. Don't really need them. But they do the bottom octave very nicely.
Curious why you chose a bipolar design... was it just to make use of the 'carcass'?
This little subs are something else. Granted, I'm still not finished the integration with the Mags yet as there are some things that aren't quite right; but, for their size they 'fill' very nicely. What's crazy is that even when the system is running at high levels (95db peaks) the woofers are barely moving.
I had bipole in mind for extension. With the woofers facing forwards and back it was either dipole or bipole, since dipole would have cancellation I choose bipole. It makes for a more percussive bass as well, which complements the maggies which don't produce that kind of bass kick.
I run 75-80's db average, which on large orchestral works and big band jazz I listen to comes out to top peaks in the 105-115 db range.
Which Mags do you have and where are you crossing your bipole bass bins at?
I run a TIV/Neo8 and the subs were run for a short while cut in at 30hz 3rd order symmetrical with the bass panels. Did not really seem that useful even in the less bassy equidistant arc configuration, but gave me punch that would otherwise not be there. When I started experimenting with wall loading the bass panels the subs became superfluous entirely as I am at 0 db relative to the mids at 20hz and there is a broad hump 30-50hz 4-6 db above midrange levels with wall loading.
I took that target curve from the Focal Nova Utopia as it seemed to do things very right in the bass (rising genty to +3-5db 20-40hz in room) as opposed to the big Wilsons with their center humps at 80-100 hz. Yet when we played the 20 and 25 hz warble tones on the wall loaded TIV the owner of the Focals was asking "what's that?". I didn't manage to get the bass to be as smooth as it is on the Focals and overshot the target at 30-50hz but it gives you a good Fletcher-Munson compensation which is good for LP and CD EQ - but makes SACD sound too bass heavy; as it is typically mastered with the bottom octave boosted 6db relative to CD releases on classical..
Anyway, with wall loading the TIV bass was sufficient and all I got from the subs was extra TT rumble and a whole mess of extra wiring..
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