135hz Semented Midbass Horn Build

[JavadS]

Javad, Do the lower notes from the horn have a natural, acoustical sound? I like the looks of your work, very neat and methodical.

They sound very good, very fast and efficient, like all Speaker designs they do have a character to their sound but it's very engaging. By far the biggest advantage is their efficiency, about 105db 1 watt. Awesome of the videos of them playing earlier in the thread, thanks for following along! Javad

[JavadS]

Started the morning with 4 enclosures with 4 sides A little overhang on the sides needed to be flush cut, BTW if you're not using a 1/2" spiral up cut dual bearing bit, check it out you're missing out! Next step to cut out the pallet baffle woofer flush hole plus port provisions, 2 5" ports per baffle. BTW these enclosures will be able to accept virtually any 18" on the market for future possibilities I always clean up the router cut with a 2" sanding drum, works very well All cut, baffle is located with 4 dowels Sanding the backs so they'll take adhesive well 5" port tubes all cut to 9", this will give a 35/25hz port tuning option if one port is plugged Back of baffle with receiver groove Port tubes secured with wood glue and Loctite construction adhesive Ready for glue up Glued and clamped with Loctite heavy duty construction adhesive, I used this as the pallet baffles have an irregular surface that wood glue may not be viscous enough to grab. Thanks, Javad

[Derekj]

Bass!!

[JavadS]

Bass!!

Lots of it!! =)

[JavadS]

Out of the clamps this morning, 2nd one in the clamps and 2 more to go. I'm letting the Loctite cure for 12 hours as the pallet baffles aren't perfectly flat and do load up a little when clamped.

[Wolf]

I really like old wood in projects!
Wolf

[JavadS]

I really like old wood in projects! Wolf

Thanks Ben!

[JavadS]

Work continues! These showed up, and a damn nice driver for $90! Tested out my port tuning, spot on! One port blocked 24hz Both ports open 32hz Model for both, 12db XO at 110hz included, 250watts Port velocities more than acceptable for both configs, both w/in xmax or so 1/2" Round over on ports and 1/4" roundover on baffle driver opening And I had a special helper =) Thanks! Javad

[JavadS]

Flushed up the baffle And 45 degree bevel on all edges And where all 4 stand Next step is some sanding and filling, some more detail work and finally a few coats of Danish Oil. Javad

[JavadS]

Flushed up the baffle And 45 degree bevel on all edges And where all 4 stand Next step is some sanding and filling, some more detail work and finally a few coats of Danish Oil. Javad

[JavadS]

Did some filling and finish sanding on front baffle interface to main cabinet









Some of gaps were as big as 1/8".
Thanks,
Javad

[300Z]

Looking nice.

[JavadS]

Looking nice.

Thanks =)

[JavadS]

Since these subwoofers will be configurable in dual opposed or stacked, I made some brackets to connect them together in different configurations. Here are the pieces cut and beveled Holes drilled for fastening knobs Fixture for transferring mounting holes and spacing brackets the same Threaded inserts used on the inside of the enclosure, these are M8x1.5mm Test fit, dual opposed And stacked, dual bolt patters allow both configurations Binding posts installed

[zobsky]

Did you consider building a single horn sub tuned to 30 - 40 Hz. Corner loaded, it would arguably occupy less space, cost less and be as (or more efficient) than the quad of ported subwoofers you're building.

From experience, ported subs don't integrate seamlessly with horn midbasses (although ported midbasses don't have as much issues integrating with horn subwoofers)

WIth your midbasses losing steam above 100 Hz, tapped horns are more or less out of the question for you - you would have to consider old school front loaded horns.