Wings on the back.
If you need to keep the baffle narrow, the side wings can be installed behind the baffle, saving 1.5 inches in width. The wings will not be visible from the front. This works well, but wings on the sides is a little better and is the default choice. See below for this style of build.
If you need to keep the baffle narrow, the side wings can be installed behind the baffle, saving 1.5 inches in width. The wings will not be visible from the front. This works well, but wings on the sides is a little better and is the default choice. See below for this style of build.
Attachments
The Manzanita Crossover
Here we have the simple and clever crossover that makes this OB speaker work. See below for the 12 and 15 inch versions. Actually, either crossover will work with either woofer, but the versions below have been tweaked for best performance with the different woofers. The big piece is the low pass inductor on the woofer. It can be 18-22mH, default 20mH. Use a 14 or 16 gauge iron core inductor. This is available from Erse, Madisound or Parts Express in the USA. This part is relatively expensive, but important to the design. Default part at the moment is Parts Express P/N 266-960 (16 ga. 20 MH)
Capacitor C1 is the high pass filter for the Vifa. R1 is attenuation for the Vifa, while R2 and L2 shape the top end response of the Vifa. Tune the value of R1 to raise or lower the overall output of the Vifa (mids and highs) and tune R2 to change just the levels of the Vifa highs. The tweaking/tuning range of R1 is usually 2:1 centered around the nominal value. R2 tuning range is the same 2:1 ratio around the nominal value. 5-10 watts is enough for these resistors. Default is capacitor is Parts Expres P/N 027-236. You can use 5.5 - 6.5 uF to suit. Look for 200 Volt or higher Poly, film and foil, MKP or Oil construction. NOTE: Connect the Vifa in reverse polarity.
Please be prepared to tweak and tune these values to suit your room acoustics and your speaker placement. The overall level as well as the slope of the Vifa response need to be tweaked for your situation. Take your time, start with the default and tune it for you room.
In series with the woofer will you see an optional woofer trap. This helps tame some come breakup of the woofer. It's a nice addition. The same trap works for either woofer.
EDIT: Now that these are posted, I will add some detail to the posts.
Here we have the simple and clever crossover that makes this OB speaker work. See below for the 12 and 15 inch versions. Actually, either crossover will work with either woofer, but the versions below have been tweaked for best performance with the different woofers. The big piece is the low pass inductor on the woofer. It can be 18-22mH, default 20mH. Use a 14 or 16 gauge iron core inductor. This is available from Erse, Madisound or Parts Express in the USA. This part is relatively expensive, but important to the design. Default part at the moment is Parts Express P/N 266-960 (16 ga. 20 MH)
Capacitor C1 is the high pass filter for the Vifa. R1 is attenuation for the Vifa, while R2 and L2 shape the top end response of the Vifa. Tune the value of R1 to raise or lower the overall output of the Vifa (mids and highs) and tune R2 to change just the levels of the Vifa highs. The tweaking/tuning range of R1 is usually 2:1 centered around the nominal value. R2 tuning range is the same 2:1 ratio around the nominal value. 5-10 watts is enough for these resistors. Default is capacitor is Parts Expres P/N 027-236. You can use 5.5 - 6.5 uF to suit. Look for 200 Volt or higher Poly, film and foil, MKP or Oil construction. NOTE: Connect the Vifa in reverse polarity.
Please be prepared to tweak and tune these values to suit your room acoustics and your speaker placement. The overall level as well as the slope of the Vifa response need to be tweaked for your situation. Take your time, start with the default and tune it for you room.
In series with the woofer will you see an optional woofer trap. This helps tame some come breakup of the woofer. It's a nice addition. The same trap works for either woofer.
EDIT: Now that these are posted, I will add some detail to the posts.
Attachments
John – that was my hunch, but I wanted to ask the cognoscenti
My situation is a traditional closed-back bookshelf. I had a vision of a sort of floating baffle nicely centered on a shelf with a 1" reveal around the baffle. Maybe best to try this with a front ported traditional design.
LOL. It a simple design that is fun to play with. You can learn a good bit just tuning it.
Yes you can tilt the baffle a little. Bear in mind that it is designed for a 90 degree baffle, but the design is forgiving. The crossover point is fairly low, thus longer wavelengths and less critical depth issues than a design crossing an octave or two higher. Also remember that the Vifa can be a little bright directly on axis, so you may need to adjust toe-in and /or the crossover.
Yes you can tilt the baffle a little. Bear in mind that it is designed for a 90 degree baffle, but the design is forgiving. The crossover point is fairly low, thus longer wavelengths and less critical depth issues than a design crossing an octave or two higher. Also remember that the Vifa can be a little bright directly on axis, so you may need to adjust toe-in and /or the crossover.
I'm thinking of doing it as much for the appearance as for the sound. Maybe even more so for the aesthetics.
Theoretically it should make the sound a little better. But I just want to make sure it won't compromise the sound in some obscure way that I didn't anticipate.
Thanks for your feedback.
Theoretically it should make the sound a little better. But I just want to make sure it won't compromise the sound in some obscure way that I didn't anticipate.
Thanks for your feedback.
The Peerless 12" had gone way up in price at one point, so an alternate woofer was found. The GRS is perfect for this project and the bigger woofer means the speaker is a little more efficient. It should play a little lower than the 12.
That said, the Peerless is a superb driver and really sounds nice. I love them.
That said, the Peerless is a superb driver and really sounds nice. I love them.