As an education "in physically building a crossover" to myself I'm going to make crossovers for an existing pair of working speakers. I will outboard the crossover and might set it up to be bi-amped for no other reason than to do it.
What I need help on is identifying these inductors! I'm going to guess identifying them from photos might be asking a bit much... But figured worth a shot.
While I could simply reuse the inductors and build them into the crossovers I'm going to make i don't want to touch the existing crossovers so I can do comparisons afterwards.
The speakers are Wharfedale 512.2's circa 1990ish. 1"tweeter, 4.5" mid and a pair of 8"woofers, ported box.
Tweeter has 4.7mfd cap inline and the smallest inductor (not labeled laying on it's side) in parallel.
Mid has the resistor followed by 32mfd cap followed by inductor labeled "40" in series and then the 12mfd cap and inductor labeled "39" in parallel.
Woofers have the solid core inductor labeled "50" (I think that's what that number is???) And then both woofers in series.
Yep, sounds like a wacked idea I'm sure but it's just as a learning exercise...
Everhard.
What I need help on is identifying these inductors! I'm going to guess identifying them from photos might be asking a bit much... But figured worth a shot.
While I could simply reuse the inductors and build them into the crossovers I'm going to make i don't want to touch the existing crossovers so I can do comparisons afterwards.
The speakers are Wharfedale 512.2's circa 1990ish. 1"tweeter, 4.5" mid and a pair of 8"woofers, ported box.
Tweeter has 4.7mfd cap inline and the smallest inductor (not labeled laying on it's side) in parallel.
Mid has the resistor followed by 32mfd cap followed by inductor labeled "40" in series and then the 12mfd cap and inductor labeled "39" in parallel.
Woofers have the solid core inductor labeled "50" (I think that's what that number is???) And then both woofers in series.
Yep, sounds like a wacked idea I'm sure but it's just as a learning exercise...
Everhard.
I would guess that's the induction in mH.
You could check the frequency with those cap values.
Jan
You could check the frequency with those cap values.
Jan
Correct me if I'm wrong they can't be induction in mh unless there's a missing decimal?
Everhard.
Everhard.
Showing my ignorance, I didn't think I could get inductors that were 39mh or bigger? At least when I go to solen.ca or parts express they don't list anything that big?
Everhard.
Everhard.
Do they have a core? If so, those values are realistic.
For air core inductors, the values are a bit high, agreed.
Jan
For air core inductors, the values are a bit high, agreed.
Jan
Those are pretty big values for air core. From what I can find on line the crossover frequencies are 1k and 5k. The markings look kinda after market. I would guessed 1/10 of what was marked. Maybe less.
That’s masking tape wrapping those. Someone has “improved“ those speakers before you.
That’s masking tape wrapping those. Someone has “improved“ those speakers before you.
The woofer inductor is the only one that's not air core.
soundchaser - agreed it's masking tape, in what respect do you think they have been modified? Inspection of them the inductor looks original? As in it doesn't look like they've been replaced? I was wondering if they were one tenth as that makes them what I would have thought (in my uneducated mind!) To be reasonable values. Btw I didn't find any value online for crossover frequencies! Hard to find much of anything other than the odd picture and basic brochure\magazine article.
I've a set of 510.2's - I'll take a peak at the crossover in those and see if they look the same -as in build "style". Obviously the components and crossover design can't be the same... Same vintage, same speaker series.
Everhard.
soundchaser - agreed it's masking tape, in what respect do you think they have been modified? Inspection of them the inductor looks original? As in it doesn't look like they've been replaced? I was wondering if they were one tenth as that makes them what I would have thought (in my uneducated mind!) To be reasonable values. Btw I didn't find any value online for crossover frequencies! Hard to find much of anything other than the odd picture and basic brochure\magazine article.
I've a set of 510.2's - I'll take a peak at the crossover in those and see if they look the same -as in build "style". Obviously the components and crossover design can't be the same... Same vintage, same speaker series.
Everhard.
Right! Seen that article ages ago but didn't look at it now..
Quick peek in the 510.2, crossover looks like it was built by the same dude.
Seeing that - do you think the crossover has been modified or not? My guess is not?
Everhard.
Quick peek in the 510.2, crossover looks like it was built by the same dude.
Seeing that - do you think the crossover has been modified or not? My guess is not?
Everhard.
