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PRV D2200 Continued.

After the initial testing of the D4500 I can say, this is not the driver for me.

The D2200 is going to be my go to test driver.
 
I found another driver if you are interested:

hifihaven.org

2" Format Phenolic Driver for Two-Way Systems

I love the sound of phenolic drivers. For me, they sound the most natural among the different diaphragm materials. Here is one I just discovered. A DS18 PRO-DPL1PH. It is spec'd at 500Hz~18kHz with a recommended crossover of 800Hz. The top-end rolls of smoothly at @ 13kHz. With a bit of EQ, it...
hifihaven.org hifihaven.org
 
THD+N said:
Don't you have one @mboxler? What were your FR sweeps like?
Click to expand...
I have the d4500Ph-Nd, it's sweeps look nothing like that AI Slop.
img_0272-jpeg.3768995


The neodymium motor makes a huge difference.
 
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Your D4500PH-ND looks much smoother.

Here is the D4500PH on the FT402ST horn. I was hoping or a driver that would dig deep, but not with10db swings.
I ran this same test with the D2200PH, it was very smooth.

As for the AI slop. That was for entertainment purposes only however it did represent this graph pretty well.

D4500ph.png
 
mboxler said:
Regarding the D2200ph, I'm struggling to passively remove the 6db shelf from 350hz to 2000hz. I do love a challenge though.

Screenshot 2026-08-17 120747.png
Click to expand...
Mike, have you considered putting an 8-ohm resistor in series with the driver and bypassing it with a 10 µF capacitor? That should give you roughly 6 dB of attenuation below the shelf, with the capacitor creating a first-order transition centered around 2,000 Hz and gradually bypassing the resistor above that point. It may get you in the ball park.
 
We know the 2200 driver has a flat response. If you are getting an FR sweep like that, the issue is the horn and I would work on that.
 
mboxler said:
Regarding the D2200ph, I'm struggling to passively remove the 6db shelf from 350hz to 2000hz. I do love a challenge though.

View attachment 3820235
Click to expand...
I can’t tell exactly because the screenshot is compressed, what are the upper and lower limits of the dB and frequency in that view?
I’m curious to scale my measurements of the D2200PH the same and compare the curve.
 
Invidiosulus said:
I can’t tell exactly because the screenshot is compressed, what are the upper and lower limits of the dB and frequency in that view?
I’m curious to scale my measurements of the D2200PH the same and compare the curve.
Click to expand...
200hz to 20000hz. 48dB to 92dB.
 
THD+N said:
We know the 2200 driver has a flat response. If you are getting an FR sweep like that, the issue is the horn and I would work on that.
Click to expand...
I realize I'm the oddball out regarding measurements :cool:

Here is a comparison between my 270Fc horn (white) and the WG45-50 (red). Both have the same drop off around 1800hz :dunno:. The WG45-50 is flatter up to that point.

270fc vs WG45-50.jpg
 
Reflection or mouth area? Care to experiment? Raise the Fc to 325, but keep the same mouth on it, if possible.
Or, heck, that's +/- ~2dB, not bad to get as low as its getting.
 
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