Driver with unknown T/S parameters.... - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 33 Old 03-24-10, 08:29 PM Thread Starter
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Driver with unknown T/S parameters....

Hey guys, took apart a Sony SA-WM500 and I was wondering how to find out the specs on the driver? Its a 12", but that's about all I know. It was in a 1.6 cu ft box, tuned to 24hz. Obviously, being a commercial sub, its limited by size. But, being a DIY-er, I am not limited by size. So I have a few feet (6?) of 16" sonotube, as well as tons of 3", 4", and 6" PVC for ports....what can I make out of this driver?

Any way to find out the specs on some database? Is there a range of volume/port length in which I can put a generic 12" driver into and be confident its better than what it came out of?

Here's some pics:





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post #2 of 33 Old 03-24-10, 08:29 PM Thread Starter
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Re: Driver with unknown T/S parameters....

This is all I could find out about the subwoofer itself:

This is all the tech specs I could find out about the sub itself:

Technical specifications SA-WM500
Please be aware that the features/specifications can differ from country to country.

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Features

Active Subwoofer
YES

Amplifier Output (DIN 0,8%) (W)
150.0

Cut-off Frequency (Hz)
50 ~ 200

Enclosure Type Bass Reflex
YES

Floor Type
YES

Frequency Range (Hz)
20 -200

Magnetic Shielded
YES

Phase-Switch
YES

Speaker Units: Bass Chassis Diameter (cm)
30.0

Speaker Units: Bass Chassis Quantity
1.0

Speaker Units: Bass Chassis Type
Cone

Type
Subwoofer


Input / Output

Input (Quantity)
1.0

Input: Cinch
YES

Input: SS-Terminal
YES

Output (Quantity)
1.0

Output: Cinch
YES

Output: SS-Terminal
YES


General Specifications

Depth (mm)
415.0

Height (mm)
425.0

Power Consumption: On (W)
110.0

Power Consumption: Standby (W)
1.0

Power Requirement
230V; 50/60Hz

Weight (kg)
19.0

Width (mm)
360.0
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post #3 of 33 Old 03-24-10, 09:10 PM
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Re: Driver with unknown T/S parameters....

You will need a woofer tester to measure the parameters or you can contact Sony support for help.
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post #4 of 33 Old 03-24-10, 09:41 PM
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Re: Driver with unknown T/S parameters....

Agreed.




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post #5 of 33 Old 03-24-10, 10:02 PM Thread Starter
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Re: Driver with unknown T/S parameters....

Is Sony support going to actually be of any help?

I thought maybe there was a database kicking around of known drivers? Perhaps there is and this just isn't in that database.
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post #6 of 33 Old 03-24-10, 10:10 PM
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Re: Driver with unknown T/S parameters....

It's a OEM driver made specifically to Sony's specs, there's little chance of finding one in a database unless soneone actually measured it. Search results turn up nothing. You can try Sony support, but don't get your hopes up.




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post #7 of 33 Old 03-25-10, 12:33 AM Thread Starter
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Re: Driver with unknown T/S parameters....

Quote:
Mike P. wrote: View Post
It's a OEM driver made specifically to Sony's specs, there's little chance of finding one in a database unless soneone actually measured it. Search results turn up nothing. You can try Sony support, but don't get your hopes up.
Thanks Mike and lsiberian.

What about working backwards from the known configuration in came in and filling in the blanks that way? Surely knowing the enclosure size, port size, and tuning should help to solve some parameters?
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post #8 of 33 Old 03-25-10, 01:33 AM
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Re: Driver with unknown T/S parameters....

Not really since the amp is optimized to work with that specific sub in that specific cabinet. You have no way of knowing if there is any boost, if so at what frequency and how much. Also at what frequency the hi pass filter is at. Without measuring the sub all you can do is try something different with it and see how it goes.




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post #9 of 33 Old 03-25-10, 04:12 AM Thread Starter
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Re: Driver with unknown T/S parameters....

Quote:
Mike P. wrote: View Post
Not really since the amp is optimized to work with that specific sub in that specific cabinet. You have no way of knowing if there is any boost, if so at what frequency and how much. Also at what frequency the hi pass filter is at. Without measuring the sub all you can do is try something different with it and see how it goes.
Right you are man. Well, what about an 80L enclosure and 4" diameter port (PVC) and just keep trying different port lengths. Measuring with my SPL meter and favorite demo scenes, I should be able to do something better than what it was in, no? What would be a good starting port length? 30"?
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post #10 of 33 Old 03-25-10, 04:20 AM
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Re: Driver with unknown T/S parameters....

Will you be using the same amp the sub came with? What diameter port and length did the sub have?




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