woofer tester 2

[parus]

Will the dayton woofer tester2 measure all parameters that i will need to build both a box and a crossover and will it show the fr curve of the drivers and finished product?
also it mentions that to break in the drivers it has
a line out but the signal needs to be amplified, where do i get a low power amp to use to break the driver in?
thanks

[unknownuser]

> Will the dayton woofer tester2 measure all
> parameters that i will need to build both a
> box and a crossover and will it show the fr
> curve of the drivers and finished product?
> also it mentions that to break in the
> drivers it has
> a line out but the signal needs to be
> amplified, where do i get a low power amp to
> use to break the driver in?
> thanks

IMO, woofer tester is not necessary. All it does is do impedance and T/S measurements. It does not measure frequency response or distortion. It's nice and handy, but you can get almost everything that you need from crossover design software like lspCad or SoundEasy.

The woofer tester makes sense only if you don't want to build your own measuremnt jig.


(Originally posted by: kyle)

[irishbreed]

How would one go about building a speaker measurement jig? And would it be cheaper than a WT2?

[unknownuser]

Provided Link: Wallin's Jig


> How would one go about building a speaker
> measurement jig? And would it be cheaper
> than a WT2?

WT2 is basically a software that measures impedance and T/S parameters. There are no complex electronic components in the WT2; just a few passive components(jig) to hook up to the driver. The electronic hardware that does the actual measurement is your sound card. For impedance and T/S measurements, even the on-board sound card is acceptable.

If You get the Speaker Workshop software(I think it's still free) and build your own jig, then you basically have a woofer tester.

The "jig" is nothing more than a couple of resistors (1k ohm and 8 ohm) with 1/8" stereo plugs. The resistors can be a cheap wirewound resistors; you just need to know the exact value of the calibration (8ohm) resistor, since the accuracy of this resistor will determine the accuracy of your measurements. So you can basically do what the woofer tester does for the cost of 8ohm resistor, 1K ohm resistor, and few other parts. As an electronic/audio junkie, I pretty much had everything I needed to build the jig. It cost me literally nothing.

For frequency response measurement, I had quite a bit of trouble with the Speaker Workshop. So I eventually broke down and bought a real measurement software, but you may not even have to do that. I believe lspCad and SoundEasy both have built-in measurement utility. So all you need is a jig, a calibrated mic/preamp, and either lspCad or SoundEasy.

The best doit-all jig would be the Wallin Jig. Wallin's site disappeared, so I attached a link to pdf version of his word document on the construction of his jig.

There are other(simpler) version of this jig. Just google impedance measurement jig.


(Originally posted by: kyle)