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Question SDX 15 PR build power suggestions ( AVS Forum DIY Speakers and Subs )
Updated: 2009-04-07 03:05:10 (15)
SDX 15 PR build power suggestions

I am thinking about building a pair of PR SDX's boxes. They will each be about 5 ft3 with 2 AE 18" 2100g radiators should tune around 19hz. I have never played with PR's before so any tips would be helpful.
I have been looking for a plate amp to power the subs. I would rather go with the plate amps for ease of use, auto on/off and I just don't have room for the EP2500. It looks like my only choices are the PE Bash or the O-audio Bash. I don't want to spend the $$ on the ED 1300 or the Dayton 1000. Are these my only options? I can't find anything else. So will 1 of these 500 watt Bash amps be enough to get the SDX rattling my house?
I am replacing the MFW 15 with these subs. I want to be sure they handily outperform the MFW in output. I think 1 will outperform the MFW in output. Has anyone else used the SDX in a PR setup?


Answers: SDX 15 PR build power suggestions ( AVS Forum DIY Speakers and Subs )
SDX 15 PR build power suggestions

With a 500 watt Bash amp a bigger box would get more output from the SDX15. I modeled it in a 24 inch cube (external measurement) with 2 of the CSS 15 inch PR's and it's looking good. The PR's are adjustable from the outside, it's easy to change tuning frequencies. The HPF on the Bash 500 can be changed to optimize your setup.

Uklit

SDX 15 PR build power suggestions

A ported SDX sub should have no problem putting more spl than a MFW-15, as for SQ, the MFW-15 is probably a little better. I was going to build a mid-bass sub and use a ED550 plate amp to power it. Since I'm going to buy a AE AV15H sub for both the low/mid bass in my room, I no longer need the ED550 amp. This amp is proven to put out the watts advertised, 550 watts. If you're interested, let me know. Even though I bought a few months ago, it's brand new.

spanish68

SDX 15 PR build power suggestions

If money is tight and causing you to buy a small'ish amp, why not ditch the PR's, increase the box size a bit, and use a port? That will allow you to put more money towards electronics. A slot port would work great.

Looneybomber

SDX 15 PR build power suggestions

Uklit.... I modeled that same setup, it looks like the PR's will be pushed beyond Xmax. I like that the boxes I modeled don't really push either the sub or PR's near xmax. I am sure with the pair of them I would be more than happy. And if not I could double the power to each and everything will be fin with that design. Although the 18" PRs are $130 a pop

I keep reading that the PE Bash can be modded to adjust the SSF. I can't find anywhere that actually shows me how to get it where I would need. Anyone know??

Are there any other options for a 500-800 watt plate amp??

scotthulbs

SDX 15 PR build power suggestions

Its not the money that is the problem. I just don't like the idea of running the EP2500. I had 1 powering a TC3000 for a short time. I prefer the ease of the plate amps, the auto on/off, SSF built in. I can get the EP2500. I am not sure what is worth more to me.... the ease of the Plates, or the extra juice of the EP2500, keep in mind I would be running just 1 2500 at 8ohm so I will get what? 1300ish watts for the pair.

Also I like the Idea of the PR's to keep the box size smaller than a ported design, and I would like to try something different.


It doesn't help that I change my mind about 10 times a day

scotthulbs

SDX 15 PR build power suggestions

Quote:
Originally Posted by spanish68
A ported SDX sub should have no problem putting more spl than a MFW-15, as for SQ, the MFW-15 is probably a little better.
This is based on what information? Do you own both?

Ricci

SDX 15 PR build power suggestions

I guess my main goal is maximum output with minimal size, I had the TC3000 in a 24" cube and that size work well into my space. That thing was great from 50hz down but I couldn't stand the lack of upper bass. I want' something that will work well from 16hz - 70-80hz, I am hoping the SDX/PR will do what I want

scotthulbs

SDX 15 PR build power suggestions

The SDX-15 is dual 2 ohm so you are limited to 4ohms or 1 ohm. I built a 24x24x22 box for my sdx-15 and 2 18" prs. I was using a Crown CE1000 which is I think 1100watts and it was awesome, until the amp died. With my setup I can go up to about 1500watts before I exceed xmax at about 15hz. I will be buying an LT1300 to replace the amp probably.

Canadian_Dude

SDX 15 PR build power suggestions

Quote:
Originally Posted by scotthulbs
Uklit.... I modeled that same setup, it looks like the PR's will be pushed beyond Xmax. I like that the boxes I modeled don't really push either the sub or PR's near xmax. I am sure with the pair of them I would be more than happy. And if not I could double the power to each and everything will be fin with that design. Although the 18" PRs are $130 a pop

I keep reading that the PE Bash can be modded to adjust the SSF. I can't find anywhere that actually shows me how to get it where I would need. Anyone know??

Are there any other options for a 500-800 watt plate amp??
The PR's are nowhere near their max with a 500 watt Bash amp in 6.1 cu.ft. (24" cube). With the PE Bash amps HPF set to 13.9 hz and 1 db of boost from 20-24 hz, the PR's max excursion is under 26 mm. That's with a box tuning of 20.5 hz.

Changing the HPF on the P.E. Bash 500 amp involves changing out 2 resistors. The values are here:

http://www.parts-express.com/pdf/300-752.pdf

and here is a pic of the board identifying which resistors:

Bash 500 Board.jpg

Uklit

SDX 15 PR build power suggestions

If you want a plate get the ED LT1300 amp, I have one on my 3.75cf sealed TC 3k 15" sub and it does great. I had a SDX sub before getting the TC 3K in the same sealed enclousure with the same plate amp. If you want an all around great driver for the money, get the AE AV15X/H driver(s). Better effiency, better SQ and mid bass than the above two. I will be ordering one and selling the other two I have now.

spanish68

SDX 15 PR build power suggestions

Was the SDX better in the upper range. Tjhat was my biggest problem with tc3k I had it was great below 50-60 but getting anyhong over that was crap. I hope the SDX is better up there if not I'm gonna be dissapointed

scotthulbs

SDX 15 PR build power suggestions

Yes, the SDX is much better than the TC 3K sub in the mid bass area (60hz-120hz). The TC 3k sub, in a crossover at 50-60hz and below is a better option (more low bass than the SDX sub).

spanish68

SDX 15 PR build power suggestions

That's good to hear.

scotthulbs

SDX 15 PR build power suggestions

Quote:
Originally Posted by spanish68
get the AE AV15X/H driver(s). Better effiency, better SQ and mid bass than the above two. I will be ordering one and selling the other two I have now.
Has there been a back to back comparison of the SDX vs AV15 in near identical enclosures? For example, you can't compare one in a large ported vs the other in a small sealed.

Looneybomber

SDX 15 PR build power suggestions

Not that I know of. The SDX is pretty good on the upper bass and SQ front. It is not the last word on low bass output, but neither will the AV15 be either. I had one of my SDX's at the WI SW GTG, where there was a pr'd AV15X, but we never even had a chance to get it mounted in an enclosure. I'd really like to see someone reputable compare those 2 drivers.

Ricci

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