The Traps, a ML-TQW experiment with Beyma TPL-150 and 12P80nd

[Cort]

Hi,
After reading a few thousand post's on this forum. I was panning to build a FLH for for the beyma that would integrate nicely with the sub I designed and built.

The Crawler, A Floor joist horn build

But as the design evolved it became apparent that I would have to build an addition first, so in horn resp i came up with this.

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Since this is my first two way speaker design decided to build a prototype cabinet, so that I could experiment with port's, waveguides, crossover's, REW etc.
Here is a couple of pics

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Honestly, some of the ugliest thing I have ever created

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But also the most beautiful sound, they draw you right in and captivate you
first in room measurement at 1 meter.

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Audessy correction

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I thought for sure I would be spending the next couple months figuring out croosovers, definately open to any suggested tweaks, but am quite pleased at the moment, they match the dynamics of the crawler extremely well, my ear can't tell them apart from 60-120 hz where the couch filter takes over the crawler. Dave Pellegrene is making me an elliptical wg for the tpl 150 which should help on the looks and maybe an elliptical port as well. Hope to hear from some of the pro's around here.
Cheers
Cort Gautier

[GM]

Greets!

Unfortunately, none of your pictures display. The FLH is an impressive build, especially considering how little room you have to work. Very nice living space too!

GM

[Cort]

An attempt at attachements rather that links to my gallery.

[buzzforb]

try a low order electrical crossover that uses the natural rolloff starting at about 1.6-1.7K to produce a higher order acoustic rolloff. Hopefully Dave's waveguide will push the Beyma back some and improve the lineup of the acoustic centers. Look into Babgy's PCD to sim and save on crossover parts.

[Cort]

Yehh...pics, always been a challenge for me,

Is it correct that the phase reversal at 400 hz is inherent to a porting or any backloaded design?

The audessy results are really bring to light what effects the room and speaker placement have, suggested reading? Right is left for the audessy correction.

[Cort]

Originally Posted by buzzforb

try a low order electrical crossover that uses the natural rolloff starting at about 1.6-1.7K to produce a higher order acoustic rolloff. Hopefully Dave's waveguide will push the Beyma back some and improve the lineup of the acoustic centers. Look into Babgy's PCD to sim and save on crossover parts.

So first order rather than second for the lowpass?
Currently have 2nd order LP 1.5mH, 10uF and HP 10uF, 1mH
unfortunately I could not get Bagby's PCD to work in open office and I don't have excel. Although it would probaly be cheaper than the parts

[buzzforb]

I probably spoke too soon. It would be nice if you could give response of each of the drivers with no crossover. I was speaking of the filter for the Beyma. It looks to have a natural rolloff in that range, but it is very possible that the woofer is having an affect here as well. That is the reason for the need for unfiltered responses.
Room response is always the dirty,family secret.

[Cort]

Planning to spend some more time with REW doing experiments, hoping to get some suggestions for experiments here. Thinking placement and baffle size for the one on the left in the pic. (right in audessy) might be priority at this point. I have built the current crossover all spade terminals to facilitate changes.

[buzzforb]

It would be awesome to have the minidsp to work with, as it incorporates so well with REW. that being said, no one will be able to do too much without raw response. While you can do a generic crossover and just do basic room correction with the DSP programs, it will not yield the best responses.

[Cort]

So use the minidsp to design the passive crossover? sound like a good idea. or just use the mini dsp and forget about the passive?
I will measure the individual driver's on friday morning