I've built cylindrical pods (completely sealed enclosures) for 2.5-inch midrange drivers that will mount on the dash. They'll be playing ~700-4000hz.
Would it be worthwhile to treat the inside of the enclosure (e.g., put foam on back wall or add Polyfil)? Do you think it would reduce the possibility of standing waves in the enclosure or affect the sound in any way?
Thanks in advance for your input!
Would it be worthwhile to treat the inside of the enclosure (e.g., put foam on back wall or add Polyfil)? Do you think it would reduce the possibility of standing waves in the enclosure or affect the sound in any way?
Thanks in advance for your input!
Open back mids?
If so and using foam, line the entire inside the cylinder.
If polyfil, fill the enclosure loosely but use fiberglass window screen (tacked to the back of the enclosure) to keep it out of the mid.
If so and using foam, line the entire inside the cylinder.
If polyfil, fill the enclosure loosely but use fiberglass window screen (tacked to the back of the enclosure) to keep it out of the mid.
Thanks, Perry. No, they're cylindrical with a back. So, really, they're small sealed enclosures.
If you had to choose between foam and Polyfil, which one would you do? What's your rationale? How might they affect the sound or output?
Really just trying to learn more here...
Thanks!
If you had to choose between foam and Polyfil, which one would you do? What's your rationale? How might they affect the sound or output?
Really just trying to learn more here...
Thanks!
Forgive me if this isn't what you mean, but they're 'standard' speakers with a basket and magnet. Here they are:
https://www.parts-express.com/Dayto...ce-Full-Range-Driver-4-Ohm-295-380?quantity=1
https://www.parts-express.com/Dayto...ce-Full-Range-Driver-4-Ohm-295-380?quantity=1
They are open back.
I don't really have a preference of foam or poly as long as you keep the poly out of the speaker. This is one of those things where people generally have a lot of opinions. Others should give their opinions on it.
I don't really have a preference of foam or poly as long as you keep the poly out of the speaker. This is one of those things where people generally have a lot of opinions. Others should give their opinions on it.
You can listen to them both ways but I'd expect to have some strange resonances in the untreated pod.
Yes, they will have both even and odd harmonic eigenmodes, so normally stuffed with polyfil/whatever and more recently with shredded jeans becoming popular. I grew up with fiberglass insulation and would us it today if still building since you don't need as much for a given stuffing density.
Regardless, as Perry noted you want to insure it can't get into the open back driver, i.e. historically with cheesecloth loosely draped/stapled over the driver(s).
Some general guidelines for stuffing.
Regardless, as Perry noted you want to insure it can't get into the open back driver, i.e. historically with cheesecloth loosely draped/stapled over the driver(s).
Some general guidelines for stuffing.
Attachments
Hey, GM... you took me to school there. Thanks for the link. Very educational!
Could I get your opinion on this? I have some of this stuff (Hushmat silencer). Do you think it would be effective to line the cylinder walls (and rear circular 'wall') in this stuff? Would Polyfil be preferable?
Thanks again!
Could I get your opinion on this? I have some of this stuff (Hushmat silencer). Do you think it would be effective to line the cylinder walls (and rear circular 'wall') in this stuff? Would Polyfil be preferable?
Thanks again!
Use both...line the inside with the Hushmat to dampen the vibrations of enclosure itself and add fiber fill to dampen internal reflections.
Mike
Mike
Probably not, Harry... but I wanted them up high and didn't want to go through the trouble of grafting them into the A-pillars.