Acoustic Research woofer and mid range driver tests

[teknofossil]

I don't know if this will be useful to anyone. From earlier conversations on the forum I thought I would post this information. If anything it will help illustrate the differences between some of the AR drivers produced over the years. I must say that I am pretty impressed these mid units seem to have weathered the years rather well. All are labeled. I am surprised the AR91 / AR92 drivers performaed as they did. Many drivers that contain ferro fluid change due to the migration of the oil component, thickening the fluid. I noticed this effect on the Allison midrange units I have and had in my lab. 

 

-T

[teknofossil]

I ran some tests on the (3) AR 12 inch woofers I have. One is the AR1W woofer from my late uncles system, the other two are the P/N 200003 woofers supposedly from a set of AR 91 systems. I replaced the surrounds which were purchased from John at M-Sound not long before he disappeared. Please note the P/N 200003 woofers are not broken in  and I would expect the Fs to decline a bit and possibly some of the other parameter to change as well. Even though I had the surround kits for a few years I only replaced them last year (2021) and have not done anything else with them other than verify they operate (with no rubbing). So a moderate grain of salt should be taken with these test results.

[fedeleluigi]

On 1/26/2022 at 5:15 PM, teknofossil said:

I don't know if this will be useful to anyone.

Yes, it will. Measurements, if properly carried out, are always useful and, above all, objective.

Thank you very much