Sub for 2x12" double horn technic

[hm]

Hello,

i made a new construction for 12" bass driver,

small, easy to built, no bass resonance, lowest membran movement.

as a sideboard subwoofer or by using a coaxial driver as fullrange horn.

As PA multi it is useful up to ~200 Hz

Any opinion or questions

 

[weltersys]

Hm,

Looks like two different enclosures, have you measured the response of the actual cabinets, or is this just a plan?

Art

 

[hm]

weltersys

yes two different horns but what happens driving electric parallel?

it is a plan

physikally identical with my other double horns, except the
subfanfare (longer), read measurement and simulation of the Kornett,
and about what from the middle:
kornettmess
about what

 

[m R g S r]

Are these being powered off the same amp channel? I don't think that's such a good idea....

 

[hm]

mRgsr,
Hello, why not? see best documented measurement of the RGH20
rdhmess

 

[m R g S r]

Will it "work"
Yes sure it will make sound.

Is it ideal?
Far from it.

Impedance curve differences will not allow the cabinets to pull equal voltage

 

[wg_ski]

Why not if they're in parallel? They wouldn't get equal voltage in series, but parallel they would. The only problem with parallel is whether they add acoustically or not (in the band where they could). Different path lengths would normally require different delays - same reason you can't effectively mix horn and regular ported.

 

[hm]

example

Hello, you delete the bass resonce, and reduce and linearized the stroke.

Delay in music can be 100 ms a delay of 5+8 ms is not listenable below 300 Hz,
http://en.wikipedia.org/wiki/Precedence_effect

Kornett IMP single simulation / real sum

 

[zobsky]

Why not if they're in parallel? They wouldn't get equal voltage in series, but parallel they would. The only problem with parallel is whether they add acoustically or not (in the band where they could). Different path lengths would normally require different delays - same reason you can't effectively mix horn and regular ported.

HM's designs utilize multiple horns with lengths calculated such that the fundamental peak and dip of one horn coincide somewhat with the fundamental dip and peak of the other. As far as delays go, there's some play room available in practice.

 

[hm]

plan

thanks zobsky,

here the plan:

 

[hm]

part list

Hi Members, owner, distributors, or producer of 12" driver,

next days i will publish the part list here in the forum,

publishing the plan on company website or DIY journals is
COPYRIGHT FREE with your driver. Production right need a licence.

driver which work:
oberton 12B400
kappa pro 12a
b+c12MH32

most driver with:
reso 30-70 Hz
Mms low as possible
B/l high as possible
EBP > 100 better 120
stroke as used, for HiFi in living rooms 3 mm would be enough.

also useful are coaxial driver or MHT horns between the enclosures,
the small one floorstanding the large with the coax, head a head on top.
MHT horns in sand filled single enclosures, with moving the enclosure
you can optimize the step response.

If there is no trust in the effect a cheap test for 3" driver plan here:
Hörner

it would be nice to publish the experience here in the forum.

 

[hm]

part lists

Hello,
Members, distributors and producer of 12 " driver
here is the part list

 

[hm]

sub done

Hello here a quick prototyp

 

[bitSmasher]

all that wood... how heavy is the box?

 

[Johnson001]

Nice plan.

 

[hm]

Hello,
small 40 kg , large 60 kg
both without driver
made with 21 mm birch multiplex and
13 mm soft fibre, light weight, easy to work with, high damping.

 

[hm]

sight

first pics

 

[hm]

Project finished, take a look
DH2x30