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Old 26th February 2011, 02:32 PM   #51
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Hi motosapien, you definitely need a filter to relieve the fullranger of the bass.
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Old 26th February 2011, 03:52 PM   #52
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Originally Posted by rjbond3rd View Post
Hi motosapien, you definitely need a filter to relieve the fullranger of the bass.
Hey thanks! I know it is a good idea in OB to prevent over excursion.
Although I'm very satisfied with my Coniston^2's (they brought me to tears last night in a drunken listening session), I'm interested in pursuing an OB project with the Alpair 7's similar to this:

New Alpair 7, small OB project

I like the idea of sealed woofers because I am a bit space challenged for an H frame like MJK's OB project. Leaning towards the bi amp route too though plate amps are a possibility.

It's time for me to take the plunge and download some speaker design software so I can better understand this hobby. A woofer box that does 40 to 150hz, a high pass and a low pass should not be insurmountable for a neophyte. I did note however that Planet 10 has box designs for CSS's line of woofers so it may not be necessary to re invent the wheel.
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Old 26th February 2011, 06:23 PM   #53
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Originally Posted by rjbond3rd View Post
Hi motosapien, you definitely need a filter to relieve the fullranger of the bass.
I'm interested in the same arrangement (FR on an OB with a separate helper woofer). What is the least obtrusive filter arrangement one could get away with? Is it really necessary to filter for both drivers, or can you just hi-pass for the FR and leave the woofer alone? I'm just trying to minimize the crossover business if that's possible.
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Old 26th February 2011, 06:51 PM   #54
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What is the least obtrusive filter arrangement one could get away with?
If you are willing to into your HF amp, the least obtrusive is to shrink the size of a coulping cap to create the appropriate HP. If not willing, then a single cap on the input that creates an appropriate HP in conjunction with the amp's input impedance.

The LP XO is less audible. A 1st or 2nd order PLLXO can usually be implemented, and typical IC active XOs aren't to bad if well exectuted.

A PLLXO on top and something like SY's Acheron XO on the bottom, would be high on my list.

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Old 27th February 2011, 02:21 AM   #55
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I probably misused the term obtrusive, but I just meant a way that would have the least negative impact on the sound. Passive crossovers have such a bad rap but I've heard a few negatives about active XO as well.

Intuitively, I like the idea of the drivers being driven separately with a crossover device like this one Pyle-Pro PPCX2 2-Way Active Stereo Crossover PPCX2 B&H Photo in between because of the high degree of control you have to experiment with. I'm also thinking about using a couple of Tripath chip amps in this arrangement which would keep the costs down. I don't mind coloring the spectrum with EQ and such if I like the sound better. But, I don't really know the in's and out's enough to know what works and what doesn't.

What do you think about that idea with woofer-augmented FR-on-OB speakers?
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Old 27th February 2011, 07:00 AM   #56
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For crossing full range drivers to woofers on OBs, there is nothing better than NP's FirstWatt B5 active crossover. They are available now from Lowther America. They are basically active filters placed between buffer circuits.... superb sounding and way better than any other active solution.

Another option is the MiniDSP. It is really flexible and easy to use.
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Old 27th February 2011, 05:47 PM   #57
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Originally Posted by ra7 View Post
For crossing full range drivers to woofers on OBs, there is nothing better than NP's FirstWatt B5 active crossover. They are available now from Lowther America. They are basically active filters placed between buffer circuits.... superb sounding and way better than any other active solution.

Another option is the MiniDSP. It is really flexible and easy to use.
The final pieces are falling into place. Thanks.

I find it very interesting that people are willing to spend $1500 on a crossover specifically made for OB's. As a newcomer, that tells me that OB is not just about economy and simplicity, but about sound quality as well. Alas, this option is too costly for me but the MiniDSP looks interesting.

Any other active crossover suggestions are welcome.
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Old 27th February 2011, 09:37 PM   #58
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Originally Posted by sprinter View Post
An extended range 12" is one option I've considered. Do you think your cabinet would benefit from a bass-tuned port? Or does it have one I don't see?
I'm a dummy when it comes to speaker design. I don't know the difference between ported and bass reflex, are they similar? Jensen called this cabinet their type "D" bass reflex. It's 31"x28"x13". There is a substantial rectangular opening just below the driver, otherwise the enclosure is sealed. You could easily blow out candles in front of that rectangle!

Click the image to open in full size.

Bobby Dipole
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Old 28th February 2011, 04:52 AM   #59
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Originally Posted by Bobby Dipole View Post
I'm a dummy when it comes to speaker design. I don't know the difference between ported and bass reflex, are they similar? Jensen called this cabinet their type "D" bass reflex. It's 31"x28"x13". There is a substantial rectangular opening just below the driver, otherwise the enclosure is sealed. You could easily blow out candles in front of that rectangle!

Click the image to open in full size.

Bobby Dipole
Very cool looking. Keep them. The bottom opening looked sealed up on the pics is why I asked. Others here can explain how this cab works better than I.
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Old 28th February 2011, 05:56 AM   #60
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I can . Speaker emits forward . Back wave is limited by cabinet
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