Purifi Audio PTT4.0W04-01A 4 Inch Midwoofer Review

Link below for full test data and evaluation.

YouTube review:
https://youtu.be/FWYkhIrYdAg

https://www.erinsaudiocorner.com/driveunits/purifi_4/

Thank you for the review Erin.

I'm confused about the breakup behavior being so wild compared to the 6.5" version which is so smooth. That seems very uncharacteristic for that company and product line. Do you have any thoughts about that?

This is the response I got back from Purifi (I'm sure they don't mind me sharing):

"Yes I see the FR between 1-2kHz – we measure more like a wide smooth dip. In this region, the surround decouples progressively and we lose some Sd (that’s the penalty of long stroke)."

I'm not sure what to make of it or the cause. Without a laser to measure the vibration characteristics of the cone, I can't really say for sure, either.

However, maybe if I can get the Near Field Scanner I can have some more conclusive data at a later date. Unfortunately, I have to ship these off asap since I gave them away via my Facebook group page. Along with the Scan 18wu and SB 17CAC drive units I just posted. About $1500 worth of gear I gave away today. :)