What is the "screening protocol" to check these drivers? Don't know if I have the equipment, but otherwise I won't know if it's good until first fireup.
Thanks,
Russellc
Use a calibrated measurement microphone and REW software. Mount tweeter securely to something - even a bench vise etc can work. Measure with mic 0.5m away and sweep at 2vrms and look at distortion. It should not have a large anomalous elevated bump of distortion around 2kHz that can be as large as -30dB. Should be closer to -40dB to -50dB. I still need to check impedance sweep between good and bad. But suspect it might not show much.
I also have a early model of a popular speaker design mic, but I dont know that it is calibrated. I need to hunt that box up and have a look. Seems like I remember something about later models being calibrated, that was in earlier 2000's during the Econowave building days. Once zilch died, so did my advances in measurement.
Russellc
Russellc
No, its one of the early ones Parts Express sold. It was actually for measuring speakers! You dont want to hear me do karaoke or any other singingIf it’s a measurement mic that should be fine to show distortion. Just don’t want to use some random karaoke mic.
for that matter!
Russellc
Hi X,
Nice project! As this will be a commercial offering, two things to consider: the visible screws on the side for the wings have DIY spelled all over them, maybe this will be covered in final production run- and having any visible spaghetti of wires on the back as seen on prototypes would probably lessen the WAF quite a bit. I would consider routing them in a recess on the backbone and cover that recess with, say, a U frame aluminium profile flush with the backbone.
Cheers!
Nice project! As this will be a commercial offering, two things to consider: the visible screws on the side for the wings have DIY spelled all over them, maybe this will be covered in final production run- and having any visible spaghetti of wires on the back as seen on prototypes would probably lessen the WAF quite a bit. I would consider routing them in a recess on the backbone and cover that recess with, say, a U frame aluminium profile flush with the backbone.
Cheers!
I know several people already starting on the cabinets. The iron core inductors should be here any day now and I can finally ship the XO kits out very soon. I appreciate everyone’s patience on this. It would have been another month+ if we waited for the inductors to arrive from back order on Parts Express.
XRK,
You are showing Noico strips straddling the wiring terminals in the upper pic. Is this an additional dampening precaution that we DIYers need to take? Is it due to the
XRK,
You are showing two Noico strips straddling the tweeter wiring terminals. Is this a precaution we DIYers need to take too? Is it related to your mid & tweeters mounted on a removable panel rather than on a monolithic front panel?
J. H. Clark
I added that to see if cabinet panel resonance could be reduced. This was when I was chasing some distortion in the 6FE100 that was inherent in the driver itself. When I switched to 5MR450NDY it went away. So not needed. Also if one piece baffle (no removable panel) there is less chance for resonance of the smaller panel. So no, it’s not required.