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Old 4th February 2013, 07:21 PM   #51
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Quote:
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... some 4" flexible tubing
Not a highly suitable material for a speaker enclosure.

dave
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Old 4th February 2013, 07:28 PM   #52
wicked1 is offline wicked1  United States
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Just playing around w/ what I have right now.
The ff85k sounds better, but doesn't mix as well w/ the woofer.. This is when that DAC active xover would be useful.
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Old 4th February 2013, 08:42 PM   #53
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I can't edit anymore, but it's worth mentioning... Stuffing the tube more made a big improvement. It maybe stiffened up my flex-tube, and definitely evened out the frequencies.. They sound great! Much better than before the ff85's were in their own chamber. The sound fills the room more now... Not sure exactly how to describe it, but the full-range magic is there, stereo imaging is great. Maybe that simply means I'm getting them dialed in properly.
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Old 4th February 2013, 08:52 PM   #54
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-Just in case it isn't clear, that tube is sealed around the back of the ff85k hole and curves around to the hole where the mid driver used to be located.

tubes are not the best to use for mid chamber, so I guess the stuffing helps a bit
and further, routing it back to the front, like you say it does, means you have unintentionall 'phased signal' from the tube
or maybe I have misunderstood, and the 'old' midchamber is closed
means it could work as 'acoustic buffer', which might be positive
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Old 4th February 2013, 08:55 PM   #55
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Thanks, I was wondering about that (phase)... I have been thinking it would be better out the back. I'm just not prepared to cut a hole.. And, I liked the idea of using the original hole that's in the box, but that's silly.

It's definitely in 'alpha' stage, and these aren't the materials I will use in the end!
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Old 4th February 2013, 09:09 PM   #56
tinitus is offline tinitus  Europe
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try to lift them from the floor, just a bit
and tilt them slightly back
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Old 4th February 2013, 09:12 PM   #57
wicked1 is offline wicked1  United States
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I was thinking about phase.. And could be completely wrong, so I 1/2 expect a "NO", response..
Could I extend the tube below the outlet (the old mid-driver location), and then bring it back up, and out, similar to a folded horn? Would that correct it somewhat?

Lifting the speaker from the floor and slightly tilted is true for all (or most) speakers, isn't it? I'll try it.. It helps my full range horns.
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Old 4th February 2013, 09:52 PM   #58
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Quote:
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I was thinking about phase.. And could be completely wrong, so I 1/2 expect a "NO", response..
Inadequate stuffing could allow this to be an issue. With an aperiodically stuffed midTL there should be next to no output from the terminus. Stuffing should get denser as you approach the terminus.

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Old 4th February 2013, 10:09 PM   #59
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I think I'd just stuff it as much as possible, giving approximately ideal TL response (in the classic sense of TL - all the backwave attenuated etc etc).

Extending the flexi-tube would give, er, interesting results. To be honest, I wouldn't bother: the response will be flat to 500Hz anyway, so there's no reinforcement needed.
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Old 5th February 2013, 01:54 PM   #60
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Thank you again. That is exactly what I ended up w/, going by ear. It is dense in that tube. But, maybe the whole curved and out the front thing is pointless or even detrimental. I'll keep trying different things when I've got time.
It's amazing what I've turned these trash speaker cabinets in to. All I had to purchase was a pair of woofers. (Thanks to several old projects worth of leftover parts)
I also still want to lower the xover, but that will be a relatively expensive purchase (for this cheap project) so I want to think about that more for a while.
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