W6 sub

[donradick]

But for a 3 inch diameter port, the required length was 66 cm (26 inches).
Lots of bends to get that working with PVC (my usual choice for ports)



But now the box was really getting too big.

[donradick]

Re: W6 sub

So I tried a bunch of tunings and box sizes, and suddenly, 14 Liters (70 watts with a SA70 amp) with a 2.5 inch port started to look real good:



At first glance, maxspl and excursion could be an issue:



as well as W6 excursion / frequency

[donradick]

Since I had . 5 inch BB unbraced about 12.5 x 10.5 inches for the sides and top, there was a bit of ringing on a knuckle rap. I decided that a cross brace was in order.

[donradick]

Probably should have painted the inside of the slot black. Oh well.

A similar view for the back and top.

[bullittstang]

Re: W6 sub

Very nice build and very methodical process to get to the finished product. That is a pretty imposing little driver! Are you going to do some in-room measurements? maybe compared to the Voxel?
Nice job on the finish too. Did you use raw veneer or paper-backed?

[donradick]

Re: W6 sub

Very nice build and very methodical process to get to the finished product. That is a pretty imposing little driver! Are you going to do some in-room measurements? maybe compared to the Voxel?
Nice job on the finish too. Did you use raw veneer or paper-backed?

Thanks Paul -

I actually wasn't planning on in-room measurements, but I will now!

Pretty happy with the finish - about 6 coats of shellac on the (paper backed) veneer and 1 coat of AquaZar water=based poly.
(You know the drill "It looks good enough and I want to play this tonight!")

[tomzarbo]

Re: W6 sub

That's a nice project! It looks like you may have crossed over from cool 'mini' sub to a full-fledged hairy-chested subwoofer, even though it's still compact.
That little TB'er is a beast!
Oh, did you use the neo or Ferrite version? I wasn't sure based on the comparison to the Voxel which uses the ferrite driver.

TomZ

[donradick]

Re: W6 sub

That's a nice project! It looks like you may have crossed over from cool 'mini' sub to a full-fledged hairy-chested subwoofer, even though it's still compact.
That little TB'er is a beast!
Oh, did you use the neo or Ferrite version? I wasn't sure based on the comparison to the Voxel which uses the ferrite driver.

TomZ

Thanks Tom!

I used the ferrite version - the price difference could not be beat vs the neo.

As indicated, I will probably make at least one more of these.
I've got friends who can't stop drooling at Fry's bargains - looking for a 12" sub with 200 watts for $100.
I'll bet this little guy will blow away any of those commercial mass-market subs.

[donradick]

Re: W6 sub

Here's Omnimic comparison of my W6 sub vs a stock voxel with 1/24 octave resolution.
Played OM Track 2, hope that's correct.

I don't know if this is the correct procedure - I set a level of 85 dB at one meter,
then measured close-miked on each system. It surprised me that the W6 (in Blue) was not
more flat from 30 - 100, but in any case you can see the Voxel (in Red) drop
off below 60 Hz. Still, the Voxel sort of shows an EBS alignment, with good output
well into the 30s.

Subjectively, the Voxel sounded like was working a bit hard during the test, while the W6 was shrugging
at the challenge.

[ROTECH]

Re: W6 sub

Best writeup in many moons. Very interesting project!

[bullittstang]

Re: W6 sub

I could be wrong, but I think "track 4" is the Bass-sweep on the disk. Not sure if it matters though, since these aren't really playing anything over 150-Hz anyway.
That is a nice smooth "Blue" curve, with an actual "port tuning" dip showing at about 25-Hz. Looks like a very nice and solid sounding sub build.
You have peaked my interest.

[donradick]

Re: W6 sub

Thanks guys.

When PE cranked up the "Speaker Design Team" project, I realized that my documentation was woefully inadequate, so
I learned Sketchup and tried to put more details into the build notes. One aspect of this hobby that always surfaces
in any project is the revisions and alterations and changing decisions until it's finished.
I tried to capture some of that. But, sheesh, after a number of years at this hobby, I'm still in awe of the
writeups that some guys produce.

[wayman]

Re: W6 sub

Nice build and a great read!

BTW, the W6 is out of stock already.

Cheers, Wayne

[randyohoh]

Re: W6 sub

This project looked interesting to me and I have just started to learn Sketchup and used this as practice. An attempt was made to follow your dimensions in the text and I came up with some slightly different numbers.

Attached are a couple of sketches for your review.

[Wolf]

Re: W6 sub

The venerable 1139 claims another fan!!!
Love these little mongrels,
Wolf