Seems many here are looking for dipole woofers. I just across this and have not seen it mentioned here yet.
http://www.audiocircle.com/circles/index.php?topic=47277.0
http://www.audiocircle.com/circles/index.php?topic=47277.0
Am I missing something when he is talking about the low sensitivity?
If you have a baffle cutoff of 100Hz (32.5 inch baffle from the graph on the Single Driver Website), does the system not drop off at 6 db/octave down to Fs and then 12 db/octave below Fs? That would mean with a SPL rating of 81.7dB, it would be at 69.7dB at Fs. That 12dB is a lot of power to put into it to raise it back up to flat with the rest of the system and then still have to put a lot of power into it to get it to play loud. It looks like it may be an all right speaker but I think there are others in the same price range that may do better with less power.
If you have a baffle cutoff of 100Hz (32.5 inch baffle from the graph on the Single Driver Website), does the system not drop off at 6 db/octave down to Fs and then 12 db/octave below Fs? That would mean with a SPL rating of 81.7dB, it would be at 69.7dB at Fs. That 12dB is a lot of power to put into it to raise it back up to flat with the rest of the system and then still have to put a lot of power into it to get it to play loud. It looks like it may be an all right speaker but I think there are others in the same price range that may do better with less power.
davidallancole said:
One thing that you didn't mention and is often overlooked is the role of room or cabin gain. Also, placing the driver low on the cabinet near the floor gives a mirror effect that raises the perceived level by nearly two. Placed in a corner raises it even more.
I'm not sure which graph you're speaking of, but I've seen some that are way, way off, as they take an overly simplistic approach that leave so many factors out, that they're basically useless at best and often are totally misleading. I have to say that I think that your example is too dependant on a graph and doesn't reflect the reality of dipole implementation.
High sensitivity drivers usually have a higher FS, not as much x-max and none of them, AFAIK, have an XBL2 motor. It's all about compromises, but you need to evaluate which ones you're willing to live with.
Best Regards,
TerryO
The driver is designed to be used two or four in a baffle. We are doing a W baffle and the effective baffle width is much wider than on a flat baffle.
Keep an eye on my forum. I'll explain all the design details and show how they are to be used along with measurements and an explanation of the entire system. Just give me a couple weeks.
Keep an eye on my forum. I'll explain all the design details and show how they are to be used along with measurements and an explanation of the entire system. Just give me a couple weeks.
This is the graph I was referring to:
http://melhuish.org/audio/baffle.html
Thanks for the clarification guys. I will watch this one and see what happens.
http://melhuish.org/audio/baffle.html
Thanks for the clarification guys. I will watch this one and see what happens.
Yes...what Dave said. I don't know what other tools people are using but that graph is of little use.
Linkwitz has the best technical descriptions that I'm aware of.
If you don't want to scratch all the hair off your head, just wait and give me a little time and I'll have some more details on how to use them.
Linkwitz has the best technical descriptions that I'm aware of.
If you don't want to scratch all the hair off your head, just wait and give me a little time and I'll have some more details on how to use them.
I'd also suggest that if you're intent on simulating driver response on open baffle, then you give MJK's open baffle MathCad worksheets a look-see.
You have to have a copy of MathCad, which you can find on eBay for not much, and fork over $25 to MJK. But I find the worksheets to be invaluable.
Regards,
John
You have to have a copy of MathCad, which you can find on eBay for not much, and fork over $25 to MJK. But I find the worksheets to be invaluable.
Regards,
John
I've never actually counted 'em but my best quess is that the vast majority of dipole systems f3 between 40 and 60 HZ, that includes the commercial offering. This driver seems to be capable of getting down to 20 to 30 hz dipole. That last octave takes a big hammer no matter how you do it.
I insist my top baffle be hi-eff so I can run set amps, don't really care how much power it takes to level the bass output. For me open baffle is active by definition.
Pro power is cheap and effective here.
I insist my top baffle be hi-eff so I can run set amps, don't really care how much power it takes to level the bass output. For me open baffle is active by definition.
Pro power is cheap and effective here.Yes... my thoughts exactly.
New amplifier line I brought on just for this use:
The small one is stable into 2 ohms so it would be usable with either the two driver version (4 ohms) or the four driver version (2 Ohms) and provide plenty of power. It doesn't take much power to get the drivers to full excursion in free-air so more power doesn't help.
Cost of the amplifier with drivers is $375 + shipping and its built like a tank.
New amplifier line I brought on just for this use:
The small one is stable into 2 ohms so it would be usable with either the two driver version (4 ohms) or the four driver version (2 Ohms) and provide plenty of power. It doesn't take much power to get the drivers to full excursion in free-air so more power doesn't help.
Cost of the amplifier with drivers is $375 + shipping and its built like a tank.
An externally hosted image should be here but it was not working when we last tested it.
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