New diy sub

**gperkins_1973** · **09-09-09, 04:36 AM**

Hi there,

I live here in the UK and am looking to do a diy sub. I have just sold my PB13 ultra and was looking at a dual 18" opposite sealed sub similar design to the submersive but bigger and more powerful.

What 18" subs and amp would be good to use so that I can achieve a better response in the lower hz and upper hz that will beat the PB13. Dimensions that I can go up to are 36" long by 24" wide by about 30" high.

Is this possible and what options do I have. I am new to this so your advice would be great. I have been looking at FI subs but am open to all options.

cheers

Graham

**gperkins_1973** · **09-09-09, 11:02 AM**

**ironglen** · **09-09-09, 11:50 AM**

You've got plenty of options for 18"- Exodus Mal-X, Soundsplinter, the Fi- add a pro-amp of your choice with a equalizer, maybe Behringer dsp1124 and you're ready to build. Two of any of these with power should exceed your need

At least that's what I've seen here... One of the excellent moderators may help out here. You can use winisd here to play around with modelling-it's fun to tinker with it if you've got the time.

**Mike P.** · **09-09-09, 02:56 PM**

Do you have a budget for the subs and the amp?

**gperkins_1973** · **09-09-09, 04:24 PM**

Right here goes this is what Im looking at.

2 x Maelstorm gen 2's in a sealed enclosure measuring 36" long by 24" wide by 30" high in a dual opposite configuration like the submersive run by a behringer europower 4000 amp.

Your thoughts please.

cheers graham

**Mike P.** · **09-09-09, 05:20 PM**

Actually that's exactly what I was going to suggest if your budget would allow it. The net volume of the box would be about 12 cu.ft., with each sub wired for 4 ohms and each fed from a channel of the amp they would handle the full power of the amp. Cone excursion is not an issue, there would be no requirement for a subsonic filter. Depending on how much room gain you'd get you can expect 120 -122 db at 20 hz.

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**gperkins_1973** · **09-09-09, 05:40 PM**

how would that fair against the PB13 ultra I just sold. How much bracing would I need.

cheers graham

**Mike P.** · **09-09-09, 06:35 PM**

The PB13 Ultra was tested at 105 db at 20 hz with a 20 hz tuning. I would suggest "window pane" bracing side to side and front to back.

Top view:

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**gperkins_1973** · **09-09-09, 06:52 PM**

mike

I was thinking the same after looking at the diy kit for the A7s-650 from ED.

122db to 105db at 20 hz isnt that a massive difference?

cheers graham

**ironglen** · **09-09-09, 07:06 PM**

Your house:

Your guests:

If you so wish

You're not messing around- I hope you have a strong back!

**gperkins_1973** · **09-09-09, 07:11 PM**

On a scale of 1 to 10 how powerful is that baby going to be.

cheers graham

**Mike P.** · **09-09-09, 07:12 PM**

Quote:

122db to 105db at 20 hz isnt that a massive difference?

Come to think of it, the test I read was done outside so no room gain was added. 105 + 6 db room gain would put it inthe 111 db range. The dual 18's still have a big advantage though.

**gperkins_1973** · **09-09-09, 07:19 PM**

mike

so what do I need to do to make the PB13 look tiny.

I thought an extra 6db was twice the output. Surely a dual opposite configuration 18" sealed enclosure would walk all over the PB13.

cheers graham

**Mike P.** · **09-09-09, 08:51 PM**

There's no question dual 18"s will outperform a 12" sub. By a wide margin.

**Ricci** · **09-10-09, 02:47 PM**

Quote:

gperkins1973 wrote:

Surely a dual opposite configuration 18" sealed enclosure would walk all over the PB13.

cheers graham

For real fun get 2 amps, one for each driver. Your destruction of the PB13-Ultra shall be the stuff legends are made of

. . . Your grandchildren will tell tales of the "big speaker" that their ancester had built

...You will pass go...You will collect $200...

**Flamin_D_Audio** · **09-10-09, 06:26 PM**

soundsplinter? i didnt think that was around in the uk, if anyone finds a dealer let me know!

**gperkins_1973** · **09-11-09, 09:02 AM**

Hi guys,

Quick question, How about the following:

Four of these drivers in a sealed box with 2 firing forwards and one each side running off one Behringer 4000 amp. It's a thought as someone over here on the UK thread is building a push/pull version with 2. I can get four of these for £200 less than the two Maelstrom Gen 11 drivers.

http://aespeakers.com/shop/catalog/p...products_id=68

Would I still be better with the dual 18" Maelstrom's in a sealed opposite sub or would the above sealed work with the four 15"s.

The sealed box for the four would have to be the same and that's 36" long by 24" wide by 30" high.

cheers

Graham

**Mike P.** · **09-11-09, 11:45 AM**

Are they single 4 ohm coils?

**gperkins_1973** · **09-11-09, 11:50 AM**

Mike,

Here is the link for option 1.

http://aespeakers.com/shop/catalog/p...products_id=68

The other option is the FI Q15's.

Attached is a rough drawing to show what I was thinking of.

cheers

Graham

**needmorstuff** · **09-11-09, 01:38 PM**

have you considered the IB route.. could have 4 18's then.

**Mike P.** · **09-11-09, 02:19 PM**

The Fi or AE would have the advantage from 30 hz up.

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**needmorstuff** · **09-11-09, 02:39 PM**

Quote:

Mike P. wrote:

The Fi or AE would have the advantage from 30 hz up.

Attachment 15807

not sure if yuo are aware but fi and ascent from here.. http://www.bladeice.com/products.php

**gperkins_1973** · **09-11-09, 04:02 PM**

mike

Sorry to be thick but I take it that graph is based on 4 FI's or AE 15's against 2 18" maelstroms. If theres doesn't seem alot in it. What would your advice be to go for. How would the FI Q18's dual opposite configuration compare to the dual 18" maelstrom's. Would you be able to show me them together please.

cheers graham

**lsiberian** · **09-11-09, 04:25 PM**

have you considered a folded slot port design. They have low distortion and great extension. A lot of speaker builders I know prefer them.

**gperkins_1973** · **09-11-09, 04:32 PM**

Depends on what they are like for music as the PB13 ultra disappointed me in that department. Hence going sealed

Oh and I live in an end terrace house!

cheers graham

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