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Old 1st January 2006, 02:36 PM   #1
chops is offline chops  United States
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Exclamation Need help with Sony SA-WX700 subwoofer drivers...

I have been using this Sony SA-WX700 sub for the past few months from my brother, and right now I ran into a little emergency so I cannot do the other sub project at the moment.

To make a long story short, the digital amp in the Sony just died last night (which I have read is typical of these subs).

The 10" drivers are of very decent quality; very solid and robust, and I would like to use these in a new, smaller and less expensive subwoofer project. They have a nice and heavy magnet, large vented pole-piece, a 2" voice coil, thick pulp-paper cone, huge 1" rubber surround, and a stiff dust cap.

Anyway, I was wondering (and hoping) someone on here may have or may be capable of getting the T/S parameters of these 10" drivers.

If so, I would like to build a new subwoofer system using these two drivers along with one of those BASH digital 300 watt plate amps from Parts Express.

Yes, I know I could just build a new sealed enclosure to match Sony's 1.58 cu.ft. enclosure, but I would like to, if possible, go with either a slot ported design or regular ported design just to get a little more output and extension at or slightly below 20Hz. The Sony sub (as a fully working unit) is capable of reaching 20Hz on its own, but the output at 20Hz is down about -9dB if I remember correctly from my in-room measurements.

So if any of you could help me out on this, I would greatly appreciate it!!!!

I know you all are very resourceful in finding out this kind of information, or even finding some websites that have this type of information.

Many thanks in advance!
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Old 1st January 2006, 08:55 PM   #2
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Anybody?!
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Old 3rd January 2006, 12:03 AM   #3
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The best you can hope for is to find a DIYer in your area with a comprehensive testing setup to determine the T/S parameters. Companies like Sony are almost never forthcoming with their drivers' T/S parameters - since that's proprietary information (and you might be pretty disappointed if you really knew the kind of parameters some manufacturers will settle for in their drivers, such as high Fs and Qts above 0.7).
From what it sounds like to me, unless you're prepared to shell out for a replacement amplifier, you should just try something with one of your Dayton DVC15 woofers in a sealed box and some sort of basic amplifier driving it.
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Old 3rd January 2006, 04:24 AM   #4
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Quote:
Originally posted by BAM
The best you can hope for is to find a DIYer in your area with a comprehensive testing setup to determine the T/S parameters. Companies like Sony are almost never forthcoming with their drivers' T/S parameters - since that's proprietary information (and you might be pretty disappointed if you really knew the kind of parameters some manufacturers will settle for in their drivers, such as high Fs and Qts above 0.7).
From what it sounds like to me, unless you're prepared to shell out for a replacement amplifier, you should just try something with one of your Dayton DVC15 woofers in a sealed box and some sort of basic amplifier driving it.
Thanks for the input BAM!

This is true, and I was kind of thinking about that as well. What I can do is just build a new, slightly larger sealed enclosure for them (2 cu.ft.), have them both front-firing and powered by one of those 300 watt Parts Express Bash amps and use them for my bedroom system. I have a pair of Triangle Zephyr's in there which do a pretty good job, but they could use a little help, and these Sony 10's would easily do the trick.

Back to the Dayton 15DVC, I'm thinking of maybe building a slot-ported enclosure for it, also powered by the same 300 watt Parts Express Bash amp. Any thoughts on this one?
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Old 3rd January 2006, 01:11 PM   #5
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Run it through WinISD and see what it says to do. Parts Express also has some recommended enclosure alignments I think.
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Old 3rd January 2006, 02:20 PM   #6
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Originally posted by BAM
Run it through WinISD and see what it says to do. Parts Express also has some recommended enclosure alignments I think.
I already did, as I kept a close eye on port velocity, which is at a max of 10.5 s/m @ 12 Hz. It's a nice and calm low of 7.2 m/s @ 20Hz. I can live with that.

Click the image to open in full size.
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Old 8th January 2006, 08:49 PM   #7
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Just a quick update....

I broke out my father's old Technics SU-8099 integrated amp today, rewired the Dayton 15DVC sub for dual 8 ohm operation, ran a mono signal into the "Main" input on the amp, and turned it on. Amazingly enough, eventhough the Technics is only 115 watts @ 8 ohms, it has boat-loads more slam and control than that Rythmic amp could ever dream of having. And as loud as I have been playing so far, the amp has only peaked a max output of roughly 30 watts to the Dayton sub, and that was REAL loud, easily hitting 100-105dB at my seat around 30Hz or so!!!

I am still using the original enclosure I made for it several years ago (4.23 cu.ft sealed before displacement, which comes to about 4 cu.ft with driver installed), and I never cared for the sound of it. The movement seemed very sloppy, and because of that there was a lack of detail and it was boomy. Of course I was always only using that Rythmic plate amp.

But now with the Technics connected, its an entirely different animal! The driver is extremely tight now and the detail is back. And bass extention is well into the mid-teens (Hz) without a problem.

I can't wait until I can barrow my brother's SUV so I can go get some 1" MDF and build that slot ported enclosure!

Anyway, here's a few pictures of the amp and sub.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

And just an internal shot to show how beefy and rugged this thing is. Technics don't make 'em like this anymore! It weighs a good 60lbs at least. (that face plate is solid 0.25" aluminum!)

Click the image to open in full size.
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Old 8th January 2006, 11:55 PM   #8
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You will probably notice a similar increase in 'tightness' with a pro audio amplifier of some sort, like a QSC RMX.
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Old 9th January 2006, 03:11 AM   #9
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Quote:
Originally posted by BAM
You will probably notice a similar increase in 'tightness' with a pro audio amplifier of some sort, like a QSC RMX.

I don't know. I can't imagine it getting any tighter than it is right now.

I just got done watching "The Best 25 Years Of Pop - A tribute to Trevor Horn" on HDNET on cable. The dynamic impact of the bass drums and electric bass made it feel like the instruments were right in the room with me. And the keyboard bass was rattling the whole room. I couldn't believe how good this sub was sounding durring this concert/show. I could easily hear the differences between the different bass instruments.

I've gotta say, I seriously believe that this sub with the Technics amp is beating anything that even the SVS PB12-ISD/2 I used to have did. It's much tighter than the SVS, it has a LOT more impact than the SVS, it reveals a lot more detail and has absolutely no problems reaching as low as the SVS tuned to its 16Hz setting.

And because I have it out in the middle of the front wall instead of in the corner, there is no boominess at all.

However, I did notice the amp peaking between 70 and 80 watts with music, so I'll definately have to get a more powerfull amp for some serious reference level movie playback. But I am still completely amazed at how loud this sub is playing with about 30 watts rms!
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Old 9th January 2006, 05:18 AM   #10
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That amp is absolutely gorgeous!!!!
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