Can anyone help me identify or get any information about these compression drivers? I'm trying to figure out whether they are worth doing anything with. They are unmarked other than "Kustom #1" and "Kustom #2".
Ah, it hadn't actually occurred to me they might be that low end. I assumed they were at least designed to be part of a 2-way.
Long time ago I had similar compression driver from DIY Sound Group. It was small (because of neo magnet), but it sounded really good. Do not discard just yet. Measure.
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Yes, measure. Being so small they may do better at higher frequencies than you'd expect given that a phase plug is no certainty. I'd start by taking polars to detect the higher frequency limit, and I'd consider attaching a benign horn to it first to make the reflections more predictable.
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I can just make out a bullet style phase plug through the mesh, extending almost all the way forwards to the mesh.
Is it possible to make useful compression driver measurements without a horn? I don't have a horn, but could 3d print one.
looks similar to this
https://www.amazon.com/DS18-PRO-DKN25-Neodymium-Compression-Crossover/dp/B07BVJ1T8G
https://www.amazon.com/DS18-PRO-DKN25-Neodymium-Compression-Crossover/dp/B07BVJ1T8G
In any case, things will fall apart above a certain frequency.. the question is, what frequency?
You can measure a single response and look at where it starts to show dips. This is OK but less reliable. It might therefore be even more confusing if there are higher frequency reflection based resonances.
They diaphragm is too small to be used as a "voice horn", they are likely to be built for the same application as the similar sized JBL 2414, crossed over for use from 1.9kHz to 20kHz.
Here is PowerProaudio's knock-off of the 2414:
Your "Kustom" drivers are probably from a similar company.
Good spot, the plastic part of the housing looks very similar. There is more heat sinking on the back of that one, but I wouldn't surprised it is just a newer rev of the same thing.
Drivers can be measured on a plane wave tube, but construction of the tube is more work than a horn.
Ideally, the throat should match the bug screen size, but a plastic funnel throat could be cut to the thread size, heated and threaded on, instant conical horn!
