As it’s a tweeter and has L and C in series I assume the resistance should start at zero and climb rapidly if I’ve got a connection between the pos speaker cable post and driver pos post?
What you’ve described does correctly allow you to identify which wire at the driver end is connected to the positive terminal at the back of the speaker.
But, as I say, there’s no guarantee that that ‘positive’ speaker wire is meant to be connected to the positive driver terminal. In the CAOW1 the bass driver does have the positive wire going to its positive terminal. But the tweeter has the positive wire going to its negative terminal. That’s not a mistake. It really is ‘positive’ to ‘negative’ for the tweeter.
drive units can be connected to crossovers either way around, it depends on whether the crossover design and integration with the mid-range requires the tweeter to be in phase or out of phase at the crossover point. There really is no hard and fast rule tbh as different types of crossover deisgn cause different levels of phase rotation at the crossover point.
Maybe check with Kevin how to wire them up? I agree with Simon, you need to know about the crossover.
If you can measure the speakers, doing a sweep through the XO region should sort you out - you will always want the response that is flat, rather than have a dip. Then you don’t need to know any detail apart from roughly what the crossover point is.
Ah, forgot about that. Kev said he used 2nd order crossovers for the air/tone scouts so that would put it out of phase by 180?
As JBLs live in opposite world the pos should go to pos then???
Had a pair of PMC GB1s in which mid-woofer and tweeter were connected antiphase respective to one-another - those sounded much better with the tweeter re-connected in-phase. Whatever was presumably being cancelled improved resolution and smoothness without the loss of anything noticeable. Another case where measurements < ears.
Current system sounds quite clearly better with the speakers connected out of phase when using the DAC … I need to spend time listening to other sources to work-out if this is because the DAC is phase-inverting (pre and power are in-phase), or if it’s just a subjective preference.
Absolute phase is often dismissed as unimportant at the replay end of things due to the various things done to signals between band and disc, but - at least with the current setup - I find it really matters. True, our ears are not instantly sensitive to it - it’s one of those “something’s-not-quite-right” things that slowly nags at you until you flip it.
What output devices are you using?
The ones on the BOM/PCB. FQP3P20/FQP3N30
I should have said, input devices.
Which op amps?
Hard to get most at the moment, I have some LM833s. But this one is for someone else so I have put in a socket so anything suitable can be put in later.
What’s a Whammy?
I’m building two, I wont keep either.
I did find plenty of good op amps available.
meh
Not on mouser when I did the order.
It will be a pre amp too.
Moar better.