Throw Me a Suggestion Please!

[villeneuve]

Hello!

I have a box. 360x360x360mm. I need a subwoofer. Suggestions please!



I would like something that sounds as pure and simple as the design. Just a good driver, a good plate amp, and some tuning. Some ports or a passive wouldn't hurt either. I need it to go quite high because I don't have big woofers in the towers.

I like assertive punch and soothing warmth that makes you want a hot Thai girl to massage your back. Not so much "boom boom shake the room" droning.

The reason I already have the box is because I already made a subwoofer, but the sound and specs weren't quite up to my likings, plus it kinda exploded because the amp was poop. I've actually posted it here before! I spent so much time and money on the box that I'd really like to reuse it - give it a second chance at life. I hope to fill up the holes and start fresh.

I'm asking here because you guys are a lot more tech-savvy than I am, so I'm hoping it wouldn't take you guys too much imagination to come up with something as awesome as I'd ever need.

At the moment I'm thinking a front-firing XLS 830452 + 830481 down-firing passive. Or maybe something as simple as a 23W/4557T00 thrown in a sealed box.

I have roughly 32 litres to play with. But maybe I can chuck a big block in there if I need to decrease the volume.

Any suggestions would be great!

Cheers guys. Your work is amazing.

Here's the canvas:
It had a down-firing HiVi D8G with the poop amp and two ports. F3 of 35Hz.

[ByronInLawrence]

The Parts Express web site has a neat feature which lets you sort woofers by a variety of parameters, including recommended box volumes for sealed and vented enclosures. I don't know where they get their numbers from, because they often don't make any sense. However, I did a quick search and came up with two lists of woofers they recommend for a 32 liter sealed, and for a 32 liter vented cabinet.

Definitely do not buy a woofer based on this chart. Get the T/S parameters and model it in your cabinet before buying. Don't forget to subtract volume taken up by the vents from the cabinet volume.

I don't know whether or not any of these woofers make you want a Thai girl to massage you back.

All volumes are cubic feet (28.3 liters). All lengths are in inches.

[villeneuve]

Thanks for the list! Very handy, but sadly the lowest F3 on the list happens to be the same driver that was originally in it!

I'm kinda hoping for 20Hz ported or passive, or 30Hz sealed. Maybe I'm a bit ambitious, but the Peerless and Scan-Speak drivers I noted above apparently do close to the job.

Could anyone please kindly model those drivers for me? I don't have any software, and I don't really understand it either.

[DrDyna]

Madisound says this will get down pretty well in a box about that size with it's matching passive radiator if you've got a plate amp with boosites:

https://www.madisound.com/store/prod...oducts_id=9013

https://www.madisound.com/store/prod...oducts_id=9015

20 might be a stretch for a cabinet of that size.

[villeneuve]

I used this as a bit of a guideline: 20 litres and 105dB at 25Hz:
http://www.tymphany.com/files/resour...ote_xlssub.pdf
I don't really trust that because it's manufacturer information, but I've seen a project with the same drivers in a 30l box. Thing is, the designer didn't say the results.
That project is here:
Peerless XLS10 10" Subwoofer (830452) and Passive Radiator (830481)

About the Scan-Speak, Madisound says it's shovable into a 30l sealed box and goes to 33Hz. Could be nice with a touch of boost?

I also found this on another thread:

Originally Posted by Vigier

Closed in 18 liter, with a 2.000µF capacitor in series gives a -3dB of 25 Hz.

I have no idea how that works, but if it's true, I would definitely consider building that!

Both designs come at roughly the same cost, so I'm a bit unsure of which is better.

[DrDyna]

Closed in 18 liter, with a 2.000µF capacitor in series gives a -3dB of 25 Hz.

Am I losing my mind or would that turn it into a tweeter?

[HK26147]

I have roughly 32 litres to play with.

I'm kinda hoping for 20Hz ported or passive, or 30Hz sealed. Maybe I'm a bit ambitious,

Madisound says it's shovable into a 30l sealed box and goes to 33Hz. Could be nice with a touch of boost?

IMO: Unless you are in a fairly small room - you are being "a bit ambitious" - trying to cheat Hoffman as it were.
I wouldn't add boost to try to achieve 20Hz, unless you also added an infrasonic filter below 20Hz.

[HK26147]

Originally Posted by DrDyna

Am I losing my mind or would that turn it into a tweeter?

A cap in series is a 1st order HP filter.
By using such a large cap the Fc is at the bottom of the audible passband.
But it isn't exactly the best was to filter as it is only 6db per octave attenuation.
IMO: Use an active filter with an aggressive roll off rate.

[tb46]

Hi,

Take a look at the CSS SDX10, one example is in the manufacturer's literature:

Creative Sound - Product Details

Maybe you can increase the volume slightly?

Regards,

[DrDyna]

Originally Posted by HK26147

A cap in series is a 1st order HP filter.
By using such a large cap the Fc is at the bottom of the audible passband.
But it isn't exactly the best was to filter as it is only 6db per octave attenuation.
IMO: Use an active filter with an aggressive roll off rate.

Wait...2 uF?

or 2,000 uF?