Damn - how was that packed for shipping purposes?
My brother received two B&C 18" drivers recently. They used less packaging material than PE used for one of the cheap Dayton 12" pro audio drivers I ordered about two years earlier. I was surprised they actually arrived intact.
Hi Brian,
Please disregard my Post #95.
You are quite correct, the current version of Hornresp cannot model a series-tuned sixth order bandpass enclosure.
Kind regards,
David
Hi sine143,
You noticed my careful choice of words
.You might also be interested in this post: http://www.diyaudio.com/forums/subw...ndent-front-chamber-tuning-3.html#post4312772
It should not be too difficult to "connect the dots"...
Kind regards,
David
Yea I was disappointed by the amount of packing material. Also it looked like the box had been kicked all the way to Canada. I don't think the shipping company was very careful.
The latest release (Version 39.00) can now simulate sixth order series band pass enclosures, eighth order triple reflex band pass enclosures and aperiodic bi-chamber enclosures.
http://www.diyaudio.com/forums/subwoofers/119854-hornresp-542.html#post4330720
Wow. Great work David. I really like that you can add the filter, check port velocities, toggle off the "ignore resonances" feature, etc, etc, all from the wizard. It really makes the process much more efficient. I also like how the schematic yellow highlights the relevant part of the design as you change the values. Great work.
OK new drivers have arrived and construction has begun.
Here is a silly question. Which way do I mount the woofers. All my last woofers had gaskets on the back of the woofer and I dropped them in through the baffle. These speakers only have a gasket (if you can even call it that) on the front. I am assuming I still drop the speakers in through the baffle but will it seal? Am I supposed to have a gasket on the back side of the driver?
Here is a silly question. Which way do I mount the woofers. All my last woofers had gaskets on the back of the woofer and I dropped them in through the baffle. These speakers only have a gasket (if you can even call it that) on the front. I am assuming I still drop the speakers in through the baffle but will it seal? Am I supposed to have a gasket on the back side of the driver?
Attachments
You need to put a gasket if you're front-mounting those drivers. Any good hardware store should stock weather-stripping foam tape that can be used for this purpose.
Now that HornResp can model series-tuned 6th order BP designs, perhaps it's worthwhile to look at that alignment again as a possible option.
Thanks. I'll pick up the weather stripping when I get the tee nuts.
As for the series tuned band pass I had a go at it and wasn't able to get anything better than the original design. At least with my limited skills.
And by 25" ish long?
It will add a mass load and pipe resonances so put as much damping material as you can at the end opposite the opening and line the side opposite the drivers with some sort of damping material. Measure the final response and EQ out any troublesome peaks.
Would it have been possible to put one of the 12" drivers on the face aiming into the passenger area? That would have allowed you to shorten the slot and hopefully push
the pipe resonances ever further up out of the passband.
This project turned out real well. The box hits hard and low enough for me. With the space I had I really don't think it could have gone better. I had already buit the box by the time I read the most recent advice about adding damping material. But Yea it is exactly 25 inches.
I've settled on about 120hz for a crossover. Any higer than that and it doesn't sound good. So that might be the result of the resonances. With the 120hz crossover it sounds great though. Lots of chest pounding base. Beter than I have heard in a wake boat. I'm happy with it.
I built the box out of .75 inch baltic birch and covered it with truck box lining for waterproofing. I'll try to post up some pictures.
Many thanks to everyone who helped. I could not have done this otherwise.
I've settled on about 120hz for a crossover. Any higer than that and it doesn't sound good. So that might be the result of the resonances. With the 120hz crossover it sounds great though. Lots of chest pounding base. Beter than I have heard in a wake boat. I'm happy with it.
I built the box out of .75 inch baltic birch and covered it with truck box lining for waterproofing. I'll try to post up some pictures.
Many thanks to everyone who helped. I could not have done this otherwise.