Challenger - 8" silver flute / SB waveguide

[ryanbouma]

With all the recent talk about waveguides, I figure I'll post this one up. It's a high sensitive home theatre speaker. Runs about $200 each including all materials.

Sounds good and goes real loud. Takes an absolute beating. Designed to be used with a sub. It uses an SB tweeter, Dayton 8" waveguide, and Silver Flute 8" woofer.



It's fairly large. Here it is under a 50" tv, about 2' in front of it.



I am jumping the gun a bit because I haven't totally measured it. I wanted to get off axis measurements, but ran into mic problems.

EDIT - CHANGED THE DESIGN

Some design comprimises were CTC spacing, with the lower woofer running up to the xo point and NOT shaded at all. Also, the cabinet is sealed to save space, so the bass extention is very bad, as it is meant for HT use and is meant to XO to a sub.

I'll bump this thread sometime in the future when I can get better measurements of vertical and horizontal response outside. Also, once I finish it in flat black I'll add the photos.

Thanks for looking.

[ryanbouma]

Re: Challenger - 8" silver flute / SB waveguide

Changed

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Re: Challenger - 8" silver flute / SB waveguide

i'll be doing a similar build when i settle on a wg. tm mltl tower. seems the ctc is huge. thoughts?

[isaeagle4031]

Re: Challenger - 8" silver flute / SB waveguide

I like this, but do wonder if it would be better as an MTM. I'm not sure if the tweeter can handle it, but an even lower x-over point would help too.

[ryanbouma]

Re: Challenger - 8" silver flute / SB waveguide

i'll be doing a similar build when i settle on a wg. tm mltl tower. seems the ctc is huge. thoughts?

It's a great idea. I even simmed a couple MT options for surround use later on.

If anyone is interested I can post the sims and xo.

[ryanbouma]

Re: Challenger - 8" silver flute / SB waveguide

I like this, but do wonder if it would be better as an MTM. I'm not sure if the tweeter can handle it, but an even lower x-over point would help too.

I thought about doing that a number of times. Would be easy too, all 3 cut outs are identical. But I wanted these to be low height. So tweeter on top. Also, I originally intended on a 2.5way, but that didn't fly.

A lower lower xo was problematic in getting an integrated response. I may go active with my minidsp down the road, which could be lower xo.

[ryanbouma]

Re: Challenger - 8" silver flute / SB waveguide

Here's some completed pictures.

I've been tinkering with the cross over like crazy. Keep coming back to my original. I keep switching a 1ohm resistor in front and after the tweeter circuit. In front is muffled. After is sibilant. None is perfect. Go figure.







The flash really shows now dusty my work area is! This was a fun build.

I'll post a complete set of measurements later. Hopefully in a few weeks or less.

[chrisn]

Re: Challenger - 8" silver flute / SB waveguide

Did u try a half ohm resistor before and after, splitting the value? Maybe a shunt resistor instead? I don't know why, but the cabinets look huge. I like the finish.

[johnnyrichards]

Re: Challenger - 8" silver flute / SB waveguide

Those turned out great! very "home theatery".

[ryanbouma]

Re: Challenger - 8" silver flute / SB waveguide

Thanks guys.

I probably will try a 1/2ohm. I figured I'd play with 1ohm and see. I also played with the tweeter shunt coil. The low pass seems to play nice. Not that the HP does anything wrong. Just my first real attemp at a waveguide. Wanna try all possibilities.

[ryanbouma]

Re: Challenger - 8" silver flute / SB waveguide

Been listening to this active now. My wife immediately preferred it. Almost to quickly judged the active setup I'm still on the fence. The biggest difference is the 1db wide 1.0 q boost in the baffle step region. This is clearly audible to me. I think in my smaller room the sound power from the nearly flat baffle loss is slightly over whelming.

Anyways. This is what I'm listening to. Still not measured to confirm the model.

[ryanbouma]

Re: Challenger - 8" silver flute / SB waveguide

Oh ya:

LP
LR24db/oct @ 1400hz
Delay = 0.04ms
Offset = 0db
PEQ
300hz +1db Q=1.0 (Q and magnitude could be adjusted. I think I'll try this)
600hz -2.5db Q=1.5
1350hz -2.0 Q=2.0

HP
LR12db/0ct @ 3200hz
Delay = 0
Offset = 0db
PEQ
5000hz -1.5db Q=1.5
8000hz +2.0db Q=1.5

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Re: Challenger - 8" silver flute / SB waveguide

that is the flatest fr i have ever seen. can't wait to see your measurments.
nice job Ryan.

[ryanbouma]

Re: Challenger - 8" silver flute / SB waveguide

that is the flatest fr i have ever seen.

Thanks! But once you look here it won't be: http://www.musicanddesign.com/NaO_NoteDetails.html

I can't really be proud of the flat FR. Anyone can do that with a minidsp. Active doesn't seem very popular on these boards for some reason. Arlis, you really should consider getting one for your 3-way build. It'll cost less. Do the MT with passive and the WM with active. Hard to compete with the ease of design. Only drawback is the extra wires and amps.

[ryanbouma]

Re: Challenger - 8" silver flute / SB waveguide

Did u try a half ohm resistor before and after, splitting the value? Maybe a shunt resistor instead? I don't know why, but the cabinets look huge. I like the finish.

I tried playing with a .5R. Works good in front. I think it'll become permanent on the passive version.

Yesterday I was looking at them more from a WAF factor. They seemed small to me :eek: They are big compared to your average MT, but for three 8" holes, it's as small as you can get. Smaller than most any 3 way.