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In Reply to: RE: My 15 inch two-way speaker project posted by Rpower on May 14, 2015 at 18:14:23
A DIY 2 way w 15" woofers are the best bang for the buck in all of Audio. They are not perfect, but the combination of high efficiency and dynamics will make the majority of commercial offerings sound boring and un-engaging.
Even an electronic idiot like me can build one.
My 2-way: Altec 802 w an Altec 32 horn and Jensen P15LL.
Follow Ups:
2-way systems with smaller horns like this and 15" bass nearly always exhibit a large response dip near the crossover frequency. That can work well for some types of rock, but it's deficient for nearly everything else.
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Buy Chinese. Bury freedom.
"2-way systems with smaller horns like this and 15" bass nearly always exhibit a large response dip near the crossover frequency."
Ridiculous over en-composing statement.
Not perfect but no dip at my xover at 1500hz. There's enough efficiency that some adjustments can be accomplished in the network.
> Not perfect but no dip at my xover at 1500hz.
There's no dip, but that's on axis. Off-axis there will be with a fifteen crossed that high. Off-axis response is the issue with large drivers crossed over too high, not axial response.
It's difficult to interpret a graph with no legend, especially when the Y axis is zero everywhere. Are you really crossing a 15" woofer at 1.5kHz? Sorry, that's not hi-fi.
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Buy Chinese. Bury freedom.
"Are you really crossing a 15" woofer at 1.5kHz? Sorry, that's not hi-fi."
So all the later Altec 604 are junk?
"Are you really crossing a 15" woofer at 1.5kHz? Sorry, that's not hi-fi."
Allong with Tannoy DC's, an many others.
I guess I'm glad I'm not high-fi... it seems exhausting.
No dip that I can hear. See frequency response graph below. Millions of pro audio and studio monitors can't be wrong.
Edits: 05/16/15 05/16/15 05/16/15 05/16/15
I don't see a graph in your post. That aside, what we're discussing is a fundamental concept. The laws of physics haven't being changed to our benefit just because a manufacturer slaps a logo on a deficient design. Pushing a 15" woofer into the middle of the vocal range is musical ruination.
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Buy Chinese. Bury freedom.
Have you tried an aperture plate in front of the woofer?
Does that provide some compression loading or is there another effect?
No, it's just a diffraction slot (basic physics).
There was an article in the JAES many years ago, it's in the first speaker anthology.
Just curious...what kind of efficiency can you get in this configuration?
Here is a frequency response graph of Wayne's 4Pi speaker. I'm using the same crossover and woofer and nearly the same horn, driver and box. Should be pretty close..
speaker system efficiency will be set by the least efficient drive which in this case that will be the woofer. You can figure that your system efficiency will be a hand full of db greater than the driver efficiency due to room gain. There are many methods of calculating this, most bump the numbers up for marketing purposes. Most drivers show efficiency numbers calculated at mid range frequencies so again figure of 98 - 100 db will not reflect reality below 100 Hz where you really care. Hope this is of some use to you. Best regards Moray James.
moray james
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