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-   -   Ultimate Open Baffle Gallery (https://www.diyaudio.com/forums/multi-way/123512-ultimate-baffle-gallery.html)

gadut 18th September 2019 04:21 PM

Quote:

Originally Posted by Juhazi (https://www.diyaudio.com/forums/multi-way/123512-ultimate-baffle-gallery-post5918267.html#post5918267)
Now this looks good! Which dsp are yo using? Anyway now the fun begins with listening, measuring and experimenting!

two of minidsp 2x4HD, making monoblock dsp + 4ch amplifier

indeed after electronic & woodworking completed, i'l have to learn on digital domain

Jeanper 23rd September 2019 01:53 PM

2 Attachment(s)
Latest iterations of my open baffle speakers. they are now a three-way design, Scan-Speak H2606 tweeter, Coral Flat 8 II mid and Eminence Alpha 15 bass.

John Hi 21st October 2019 01:19 AM

3 Attachment(s)
Hi,

I'd like to show my 3 way active open baffles. They've been running well for a few years now, with occasional upgrades along the way.
They look like box speakers from the angle photos, because they are 'U' baffles - but they're open at the back.

Bass is 2x12", from BK electronics in the UK. Used in their well regarded 'Monolith' subs. Similar to Eminence Lab 12.

Mids are Dayton RS150 6" Ali cones. Vifa XT25 ring tweeters on Visaton WG148 waveguides, plus 19mm rear tweeters.

Amplification, 4 stereo amps = 8 channels. Heavily rebuilt Quad 405's with no current limiting.

Active crossover. Digital FIR linear phase, measured with REW, programmed in rePhase and run through Equalizer APO.

All music and processing on a windows computer. 20Hz-20KHz -3dB in room. Measured with Cross Spectrum individually calibrated UMIK-1.

Full size speakers on 'U' baffles are unusual because of the potential for resonances in the rear cavity. The up side is powerful extended bass which integrates perfectly with the rest of the speaker.

Actually the rear resonances are fairly easily tamed. A combination of design, damping and EQ tames them totally.
The speakers are curved and sloped, with no parallel sides or edges, so resonances are not encouraged at any particular frequency, and the rear cavity is well damped with foam and wool.
Any remaining resonances are smaller that the room resonances and can be EQ'd out easily.

Attachment 789166

The finish on the speakers is Piano Black, so there are some weird reflections of furniture on the side of the right speaker.

Attachment 789163

Attachment 789164

mortron 21st October 2019 11:20 PM

Quote:

Originally Posted by John Hi (https://www.diyaudio.com/forums/multi-way/123512-ultimate-baffle-gallery-post5950727.html#post5950727)
Hi,

I'd like to show my 3 way active open baffles. They've been running well for a few years now, with occasional upgrades along the way.
They look like box speakers from the angle photos, because they are 'U' baffles - but they're open at the back.

Bass is 2x12", from BK electronics in the UK. Used in their well regarded 'Monolith' subs. Similar to Eminence Lab 12.

Mids are Dayton RS150 6" Ali cones. Vifa XT25 ring tweeters on Visaton WG148 waveguides, plus 19mm rear tweeters.

Amplification, 4 stereo amps = 8 channels. Heavily rebuilt Quad 405's with no current limiting.

Active crossover. Digital FIR linear phase, measured with REW, programmed in rePhase and run through Equalizer APO.

All music and processing on a windows computer. 20Hz-20KHz -3dB in room. Measured with Cross Spectrum individually calibrated UMIK-1.

Full size speakers on 'U' baffles are unusual because of the potential for resonances in the rear cavity. The up side is powerful extended bass which integrates perfectly with the rest of the speaker.

Actually the rear resonances are fairly easily tamed. A combination of design, damping and EQ tames them totally.
The speakers are curved and sloped, with no parallel sides or edges, so resonances are not encouraged at any particular frequency, and the rear cavity is well damped with foam and wool.
Any remaining resonances are smaller that the room resonances and can be EQ'd out easily.

Attachment 789166

The finish on the speakers is Piano Black, so there are some weird reflections of furniture on the side of the right speaker.

Attachment 789163

Attachment 789164

Beauty.

Any snaps of the back of the speakers? Curious your methods. Wish I could hear em.

John Hi 21st October 2019 11:52 PM

1 Attachment(s)
Thank you.

The back don't look nearly so smooth, being hidden away.
And there's not much to see, because it's covered with a drape cloth.

The amplifiers are stacked in the bottom of the back.
The 'wing' bits on the inside sides serve 3 purposes; -
structural reinforcement, reduce the radiating area to approx that of the bass cones, and increasing the distance between front and back for bass.

The rear tweeter fires at an angle to give a slight boost to the HF energy in the room, and avoid direct reflections.

daemonsgr 22nd October 2019 09:22 AM

Quote:

Originally Posted by John Hi (https://www.diyaudio.com/forums/multi-way/123512-ultimate-baffle-gallery-post5951594.html#post5951594)
Thank you.

The back don't look nearly so smooth, being hidden away.
And there's not much to see, because it's covered with a drape cloth.

The amplifiers are stacked in the bottom of the back.
The 'wing' bits on the inside sides serve 3 purposes; -
structural reinforcement, reduce the radiating area to approx that of the bass cones, and increasing the distance between front and back for bass.

The rear tweeter fires at an angle to give a slight boost to the HF energy in the room, and avoid direct reflections.

may I ask regarding the theory/idea of "back HF" units? (tweeter etc)
thanks

John Hi 22nd October 2019 11:05 PM

Hi,

It improves the spectral balance of sound reflected within the room to make it more neutral. Reflected sound has at least as much energy as the sound coming direct from your speakers.

It's a well proven thing, with many high end speakers using them.

Quite a lot on the internet, and several threads on this forum mention them.

https://www.diyaudio.com/forums/mult...g-tweeters.htm


ORION++

pengesluk 23rd October 2019 08:37 PM

1 Attachment(s)
Initial drawing of a modular OB concept that I tested out. Will try and find actual photos later.

Fertin 38EX FC 15" - various Fostex 8" wide band versions - RAAL Lazy.

lousymusician 24th October 2019 12:23 AM

1 Attachment(s)
OK, I'll play. Here's my current, evolving, 3/4 OB den music system. The room is small for OB speakers, but it's too small for much of anything to work optimally. This was mostly built from drivers I already owned and re-used from other builds. Total driver cost was under $100/channel.

From the top:

TC9FD18-08, 3000 Hz & up

Peerless SDS-860656, 700 - 3000 Hz

Jamo 20388 (PE buyout from several years back), 5" deep u-frame, 150 - 700 Hz

NHT 1-11-083-2 woofer (from NHT liquidation, I think these were a raffle prize at an early Burning Amp), ~30 to 150 Hz, small sealed boxes with a gentle Linkwitz transform to reduce the system Q from .9 to .56 and slightly extend the response.

Baltic Birch cabinetry with clear poly.

MiniDSP 4x10HD, using S. Harsch topology (BW4 lowpass, 2nd order Bessel highpass acoustic slopes, upper driver delayed 1/2 wavelength @ crossover frequency + physical offset compensation) for all three transitions.

4 channel Modulus 86 amp for the upper drivers (sliver faceplate at the bottom of the rack).

2 stereo Breeze TPA-3116 amps running the mid-bass & woofers.

Bill

daemonsgr 24th October 2019 08:10 PM

Quote:

Originally Posted by John Hi (https://www.diyaudio.com/forums/multi-way/123512-ultimate-baffle-gallery-post5952637.html#post5952637)
Hi,

It improves the spectral balance of sound reflected within the room to make it more neutral. Reflected sound has at least as much energy as the sound coming direct from your speakers.

It's a well proven thing, with many high end speakers using them.

Quite a lot on the internet, and several threads on this forum mention them.

https://www.diyaudio.com/forums/mult...g-tweeters.htm


ORION++


thanks!


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