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Old 13th November 2012, 01:06 PM   #21
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What he means is that in the dipole, without a filter in place, as frequency decreases, excursion goes up and ends up being destructive. Even if you were after say a 1st order roll off at 500Hz and your baffle was sized to give you just that, you would still need a suitably steep filter to keep excursion either constant with decreasing frequency, or decreasing with decreasing frequency (steeper filter).
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Old 13th November 2012, 01:14 PM   #22
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Yes that makes sense, I realized I made a mistake in amusing a 12dB/octave instead of 6dB/octave natural roll off.

I have now implemented a LR4 at 120hz and dipole correction shelf.

I just hope that one Peerless XLS 830452 in each baffle will suffice?

I have cut all the MDF ready to make the H-frame, just need to route the driver cut out in the baffle and glue together.
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Old 13th November 2012, 03:01 PM   #23
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I used 1 xls per channel for a long time before upgrading to a push-pull pair. One pair is fine unless you're wanting to really listen quite loud.

I am sure you are aware of the ebay buyer who routinely sells 452s for about 90 each, should you feel the need to double up. The gains are worth it imo, of going push-pull, but by no means necessary unless you really need the extra output.
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Old 13th November 2012, 06:51 PM   #24
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I'm not sure what you'll end up with using a 10" woofer and 12" baffle, that seems pretty small to me - for OB. But most of the OBs I've built or worked with end up with about a 9dB/octave roll-off. Not sure why, but that's how they measure. At least down to Fs.

Will be very interested to see what results you get.
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Old 13th November 2012, 07:09 PM   #25
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Will soon see, I may end up buying another pair of XLS 452s.

Oh and BTW I did buy my pair from ebay for 75 each iirc.
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Old 13th November 2012, 07:32 PM   #26
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Just thought I would post a couple of pics of my progress.

I have yet to build the H-frame woofer so my BK subwoofer is supplying the bass for now, it also uses a Peerless XLS woofer so will look similar to the photos when complete.
The design is also a copy of Gainphile's S16 speaker.

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Old 13th November 2012, 07:40 PM   #27
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Ah, cool. Now I understand the sub is boxed. Didn't get that before the photo.
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Old 14th November 2012, 10:52 AM   #28
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but you're probably peaking around 1khz and rolling off b4 you make it to the sub.
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Old 15th November 2012, 08:35 AM   #29
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Hi, just jumping in my front are Ripols , Peerless the classic one with correction network, Manger, x-over mini DSP. Going 7.1 I like to have the rest open baffle. I could easily build another ripol as needed but I don't think so. In this setup the zurround speakers can roll off naturally I do guess
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Old 4th February 2013, 12:49 PM   #30
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Well I managed to get the H-frames built, had some 18mm MDF cut to size at my local garden centre, spent two hours this morning routing rebates and the driver cutouts and then gluing it all together, used a ratchet strap to hold it all together while it dries.
Woodwork is not my strong point!

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