I stand on what I said in my 1st message and, again, why you would put a cap in parallel before the tweeter and why you'd mount the x-over inside the box?
This is the crossover shown on the parts-express website. Very different from the diagram in the "manual" which you are showing.
https://www.parts-express.com/pedocs/specs/300-7140--c-note-crossover-with-frequency-response.pdf
Can't comment though if it is correct...
https://www.parts-express.com/pedocs/specs/300-7140--c-note-crossover-with-frequency-response.pdf
Can't comment though if it is correct...
i'm with ya dude, but sadly i did not design these, they are $100 for a pair of speakers from parts-express called the c-notes, just following the kit/design
just looking for a little help from some folks who know a bit more than i on where to look for issues on what could be causing it
on another thread, i was asked to post with some additional measurements
looks like the crossover is what is causing the rise, reproducible on all 3 fully assembled speakers
- xover measurements -
the below shows a full sweep assembled
sweep with just the mid bass (mb)
sweep with just the tweeter (tw)
- no xover -
just the tweeter
looks like the crossover is what is causing the rise, reproducible on all 3 fully assembled speakers
- xover measurements -
the below shows a full sweep assembled
sweep with just the mid bass (mb)
sweep with just the tweeter (tw)
- no xover -
just the tweeter
Attachments
Isn't there a forum on Parts Express? It seems you could find the designer and ask.
I found the page for it here - no name for the designer, but the page does say you get tech support, AND there's a forum on the site.
C-Note MT Bookshelf Speaker Kit Pair with Knock-Down Cabinets
I put the crossover into LTspice (.asc circuit attached so others can follow along), the electrical response of the tweeter circuit into a 4 ohm resistor is flat within 1/4dB starting just over 4kHz.
I'm offhand guessing it's the tweeter's inductance causing the rise (the crossover gives a higher voltage into the tweeter's higher impedance at higher frequency), and a zobel (series R-C) of the right values across the tweeter should fix it. But then again, I'd ask the Parts Express folks what's going on and what can be done about it.
View attachment xover.asc
Can you increase the value of C3, either by replacing it with a higher value or by fixing one in parallel with it?
yeah, i post on the PE forums as well
as for the crossover design, thank you so much for doign that, i literally have no idea what you guys do there
is there any way if perhaps C3 was missing in the circuit, that it would sim to my measurements? if so, perhaps i can start looking there to ensure everything is connected there correctly