Dayton Twin Towers

[Chris Roemer]

Re: Dayton Twin Towers

The dual 8's (in parallel) are approx. 6dB more sensitive than a single running at 8Ω.
So . . . the mid and tweeter would need 6dB more attenuation, ALSO, the mid-tweet Fc could (should) be higher (dependent on their C-C spacing). THIS design did NOT optimize that cross point, it was based on the OP's rather large spacing, since he already had the cabs built.

So, you'd have to mod the LP, and the BP AND HP. That's the whole enchilada!

[kevinr]

Re: Dayton Twin Towers

okay , thanks for the info . I won't be using Toms C-C spacing but having the drivers close as possible

[johnastockman]

Re: Dayton Twin Towers

The Lyra was designed as sealed, but a little figuring with WinISD or Unibox would give you a vented volume suggestion and port dimensions. IIRC, the cabinet volume was about 1.8 ft3, give or take a tenth or so. I've used the Lyra in many OEM cabinets from 1.5 ft3 up to 2.2 ft3 with great results. I haven't dome a ported one though. Here's the Lyra XO:





John A.

[kevinr]

Re: Dayton Twin Towers

okay thanks for the enclosure and xover info John

[Thumper Tom]

Re: Dayton Twin Towers

Speaker grills

Back of the grill



Keep the grill spaced for the fabric



Finished front

[Thumper Tom]

Re: Dayton Twin Towers

Finished the speakers, thanks to the cold snap we got here in Iowa, the finish is not 100% to what I wanted. Come this summer I will be sanding them down and re-doing the finish. But overall I am very happy with how everything turned out, love the front grills and how everything is blacked out. Now the photos.....





Now it is time to enjoy them before I take them to my Dad's. :D :D :D

[Thumper Tom]

Re: Dayton Twin Towers

Been chatting with my dad about redoing his speakers. They are not bad but could use a lot of improvement from where I was 9 months ago. Thinking about doing sealed box and making them a little smaller form factor. I have been toying with the idea of a narrow face for the mid and tweeter to reduce baffle step and give them an open space.

Here are two concept drawings based on a 1.5 sqft box, I am open to suggestions on both and the only difference is the wings on the top part.

First my favorite of the two:



The second:

[Thumper Tom]

Re: Dayton Twin Towers

Ok, played a little bit more with some Clio files I downloaded and this is what I came up with for a 1 cuft box, with baffle step, and everything compensated. Again, this is just simulated so I am not a 100% if this would be the same frequency response.



Also an updated box:



If this goes any further then I will start a new build tread in the TT area.

[Chris Roemer]

Re: Dayton Twin Towers

You're probably talking about diffraction. Most of the baffle-step probably falls in the woofers' range and won't change much.
The bottom will end near 50Hz, instead of 30 for the ported box (they WILL be smaller though).