This is mainly an archive thread and also some curiosity about the Peerless 4" P830870 HDS Series Woofer.
http://www.tymphany.com/files/HDS-P830870%20Rev%202_0_0.pdf
Madisound has sold this kit for a few years: The Madisound Speaker Store What is shown in pic is the kit, bought a few years ago. I did have a three set, this is all that is left now, just parts for one.
It was in a MS recommended size sealed box, but advertised as vented: Peerless 830870 4" PPB Cone HDS Woofer 264-1070
Today's project is gluing up a VENTED test box with cut-offs, which had just enough scrap.
Tip - cut woofer hole 3 -3/4" and bevel/chamfer back of baffle, the woofer(s) will slip in, without notching for terminal.
xo plan attached, the pre made xo does not fit the in the 3-3/4" hole which drove me crazy and why the sealed box ended up in the wheelie-bin. I.e. had to cut the sealed box open 🤐
The sensible thing to do is simply DIY two mini xo's for woofer and tweeter.
Note a 2.2ohm series tweeter resistor is not shown on Schematic.
more to come..........
http://www.tymphany.com/files/HDS-P830870%20Rev%202_0_0.pdf
Madisound has sold this kit for a few years: The Madisound Speaker Store What is shown in pic is the kit, bought a few years ago. I did have a three set, this is all that is left now, just parts for one.
It was in a MS recommended size sealed box, but advertised as vented: Peerless 830870 4" PPB Cone HDS Woofer 264-1070
Today's project is gluing up a VENTED test box with cut-offs, which had just enough scrap.
Tip - cut woofer hole 3 -3/4" and bevel/chamfer back of baffle, the woofer(s) will slip in, without notching for terminal.
xo plan attached, the pre made xo does not fit the in the 3-3/4" hole which drove me crazy and why the sealed box ended up in the wheelie-bin. I.e. had to cut the sealed box open 🤐
The sensible thing to do is simply DIY two mini xo's for woofer and tweeter.
Note a 2.2ohm series tweeter resistor is not shown on Schematic.
more to come..........
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So yes, pretty impressive bass; they were going pretty strong down to 60hz (sweep test). Darn smooth also! The tuning also looked good, Fs-68hz.
I'm going to see if I can get a buddy to measure them, if okay, we can clone this test box.
Surprised this worked so well with the high Q drivers, .74.
If they are "silicon-ed", that brings down the Q ?
I'm going to see if I can get a buddy to measure them, if okay, we can clone this test box.
Surprised this worked so well with the high Q drivers, .74.
If they are "silicon-ed", that brings down the Q ?
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Thanks for that.
We did silicone them in the sealed boxes and thought they worked better. Of course silicon can be pulled off easily when applied to plastic cones.
Pic: box that got cut in half and silicon on cones.
btw, the .42 (net volume) vented box has some power; the overhead ducts in the room were vibrating, not that loud/not much cone movement.
We did silicone them in the sealed boxes and thought they worked better. Of course silicon can be pulled off easily when applied to plastic cones.
Pic: box that got cut in half and silicon on cones.
btw, the .42 (net volume) vented box has some power; the overhead ducts in the room were vibrating, not that loud/not much cone movement.
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So the plot thickens, buddy want's to compare Sealed to Vented.
The mini mtm does have nice bass, AND didn't think the cones were bobbing that much, SO what price am I paying for a BR box vs. sealed
- especially if they are used with a typ 80hz xo.
I wonder if the moderator can change my DIY handle to MR. Prototype
The mini mtm does have nice bass, AND didn't think the cones were bobbing that much, SO what price am I paying for a BR box vs. sealed
- especially if they are used with a typ 80hz xo. I wonder if the moderator can change my DIY handle to MR. Prototype
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