I have a pair of SF W20RC38-04 drivers (4 ohm version) that I'd like to make some 2-way floorstanders with. Was thinking of matching with waveguided D2604/833000 or XT25TG30. I've never designed my own crossover before so was looking for an existing one but came up empty. Anyone know of any existing designs using these 4 ohm 8" SF's? I did come across the Decware DM945, is the crossover published anywhere?
Thanks in advance.
Thanks in advance.
Would be tricky making a 2 way with it, probably. It's actually got a pretty friendly response in the higher frequencies, but directivity matching might be an issue. I don't suppose you have the means to make a polar map? I also saw you were asking for frd/zma files for the woofer. You don't plan on designing the crossover based on those responses do you? I'm kind of a newbie though. Only have one quickly cobbled together speaker design to my name, so don't take my advice before others get a chance to chime in
Another option would be to make a WAW. I think planet10 used the silver flute in some of his designs
The first thing you need to do is find a waveguide that can carry down to below 2kHz and meet the woofer. Not only is this an important step, but you couldn't begin thinking about the crossover until you do.
I think the Monacor WG-300 would work right?
https://heissmann-acoustics.de/en/test-scan-speak-discovery-d2604-830000-mit-wg-pct-300-wg-300/
https://heissmann-acoustics.de/en/test-vifa-xt-300-xt25tg-waveguide-wg-300/
https://heissmann-acoustics.de/en/test-scan-speak-discovery-d2604-830000-mit-wg-pct-300-wg-300/
https://heissmann-acoustics.de/en/test-vifa-xt-300-xt25tg-waveguide-wg-300/
Yes but to a different woofer. Though I might not choose it myself, I guess it's within reason since the crossover will tend to blend.
It is also useful because you'd now have some approximate polar curves to work with.
It is also useful because you'd now have some approximate polar curves to work with.
I did look there but those are for the 8ohm version unfortunately.
I am working on my own crossover based on the DM945, i.e. a single cap on the tweeter. It's difficult for me as I don't have any measurements of the silver flute. For the tweeter I am utilising Heismann's waveguide test results.
I am working on my own crossover based on the DM945, i.e. a single cap on the tweeter. It's difficult for me as I don't have any measurements of the silver flute. For the tweeter I am utilising Heismann's waveguide test results.
I used that woofer in one of the variants of my Flex-8 design which pairs the woofer with the LaVoce DF10.101LS CD and Celestion H1SC-8050 horn:
https://www.mtg-designs.com/diy-speaker-plans/flex-8
https://www.mtg-designs.com/diy-speaker-plans/flex-8
I've seen some SF measurements.
Not nearly as flat in the upper end as their heavily smoothed graphs would have you believe.....
I had the 4ohm 8" and the 6.5" shielded.
Not nearly as flat in the upper end as their heavily smoothed graphs would have you believe.....
I had the 4ohm 8" and the 6.5" shielded.
Ok, here's my first attempt at a 2-way crossover of said SF and XT25 with WG-300. Simulated 16 liter enclosure tuned to 30 Hz. LR4 x-over at 1800Hz.
Phase is out by ~1500Hz, not sure how to fix that?
Am I on the right track?
Phase is out by ~1500Hz, not sure how to fix that?
Am I on the right track?
Yes, phase should be easier to see assuming you just flipped each one.
Note the woofer rolloff is slower which is why phase is different.
Note the woofer rolloff is slower which is why phase is different.