View Full Version : The PA130 MTM - 102dB with 8 watts, under $90/pair *PIC*
01-22-2008, 05:36 PM
I just might have to make a kit out of these...
01-22-2008, 05:37 PM
01-22-2008, 05:56 PM
Great job! I just happen to have all those parts at home and I think I will put it together this weekend and see how it sounds. Thanks for sharing.
01-22-2008, 06:07 PM
Use a 2" dia x 6.5" long port :)
Let me know how it sounds! I have the PA130's but need the ND20's and the xo parts.
In this small of a box they will be missing the deep bass but should still hit with some authority.
01-22-2008, 06:10 PM
this is designed to have the port placed on the rear at the bottom, which is why the whole woofer and tweeter assembly is shifted up an inch or so.
01-22-2008, 06:30 PM
Any way to kill that doo-dad t 5.5 K ???
01-22-2008, 06:46 PM
> Any way to kill that doo-dad t 5.5 K ???
Ehh maybe, it completely disappears 15 degrees off though so I figured it wasn't worth the trouble :)
01-22-2008, 06:52 PM
total cost for drivers, crossover parts, port tubes, and terminal posts: $95.96
016-5 X 2
027-342 X 4
027-344 X 2
260-301 X 2
260-387 X 2
027-425 X 2
295-010 X 4
255-208 X 2
255-234 X 2
275-030 X 2
01-22-2008, 08:39 PM
> total cost for drivers, crossover parts,
> port tubes, and terminal posts: $95.96
> 016-5 X 2
> 027-342 X 4
> 027-344 X 2
> 260-301 X 2
> 260-387 X 2
> 027-425 X 2
> 295-010 X 4
> 255-208 X 2
> 255-234 X 2
> 275-030 X 2
I guess all 3 drivers are recessed? It looks like it.
01-22-2008, 09:15 PM
yeah, but it really doesn't matter for the woofers, since they have ringy dingy stamped frames anyways :)
Just lightly countersink the ND20 and all should be well...
I'm ordering my parts tomorrow, let me know what you think!
01-22-2008, 09:48 PM
Looks like these could be a great low-power room fillers. Any harmonic distortion test yet?
01-22-2008, 10:33 PM
In the woofer filter have you tried using just the series inductor along with a series notch filter centered around 6 or 7kHz (like the circuit shown below)? You'll have to adjust the Q of the filter to get it just right but I've found that this method can work quite well and it reduces the amount of phase cancellation between the drivers in a lot of cases. It may or may not work with those drivers but it wouldn't hurt to simulate it and see how it works.
Pete Schumacher ®
01-22-2008, 11:07 PM
> In the woofer filter have you tried using
> just the series inductor along with a series
> notch filter centered around 6 or 7kHz (like
> the circuit shown below)? You'll have to
> adjust the Q of the filter to get it just
> right but I've found that this method can
> work quite well and it reduces the amount of
> phase cancellation between the drivers in a
> lot of cases. It may or may not work with
> those drivers but it wouldn't hurt to
> simulate it and see how it works.
An alternative would be to add a series RC in parallel with the LP inductor since copper is so expensive.
Either way, the "nasties" in the response above 2KHz could be much better tamed by providing a quicker roll-off in the driver's pass-band.
> I just might have to make a kit out of
I don't think you can play it that low, even third order.
Pete Schumacher ®
01-23-2008, 08:22 AM
> I don't think you can play it that low, even
> third order.
The ND20 in his plot is down quite a few dB at 2KHz. Looks to me like the reverse null is around 3KHz, maybe just a touch over. That should be acceptable.
01-24-2008, 02:47 PM
Have you also figured out how to make a center channel for this as well?
01-24-2008, 05:24 PM
how should I go about doing that? Do you mean maybe add more drivers? sealed?
01-25-2008, 10:28 PM
> Hey John,
> how should I go about doing that? Do you
> mean maybe add more drivers? sealed?
No, keep everything the same, driver wise. But if the cabinet were to be turned off axis, it would require a slight change in the crossover. I don't have any good crossover software, so that is why I asked.
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