The Monolith open baffle planar speakers

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HAL

Re: The Monolith open baffle planar speakers
« Reply #60 on: 8 Jan 2018, 04:05 am »
Nearfield sub measurements look good, so off to building the second 2x12.   :D

 

HAL

Re: The Monolith open baffle planar speakers
« Reply #61 on: 9 Jan 2018, 03:25 am »
The second 2x12 H-Frame is loaded with servo drivers and ready for wiring.   Both HX300 amps are working with sub #1.



neekomax

Re: The Monolith open baffle planar speakers
« Reply #62 on: 9 Jan 2018, 03:38 am »
Looks awesome, would love to hear that kind of subwoofer sometime. Seems like you got to build it to hear it.

HAL

Re: The Monolith open baffle planar speakers
« Reply #63 on: 9 Jan 2018, 03:44 am »
There a quite a few people around that have them.  Danny has a thread in GR-Research Circle with owners that will demo their speakers.  Someone might be in your area. 

neekomax

Re: The Monolith open baffle planar speakers
« Reply #64 on: 9 Jan 2018, 03:51 am »
That would be cool. How would you describe how the sound compares with an array of sealed box subwoofers like I have?

HAL

Re: The Monolith open baffle planar speakers
« Reply #65 on: 9 Jan 2018, 03:54 am »
They do not load a room the same was as a sealed or ported woofer.  Sounds very natural to me in a 2x12 or larger array.  The 6x12's sound massive in my room, but no boom or bloat like most box subs.

JakeJ

Re: The Monolith open baffle planar speakers
« Reply #66 on: 9 Jan 2018, 04:43 am »
These subs are scarey because they are so fast.  Zero overhang.  The servo circuit starts and stops the drivers on dime and gives ya nine cents change back.  Not to mention there few subs that can keep up with the P-Audio driver used in the famous Super V design.

Probably a good reason HAL is using them mated to NEO drivers which is my plan.

neekomax

Re: The Monolith open baffle planar speakers
« Reply #67 on: 9 Jan 2018, 04:49 am »
These subs are scarey because they are so fast.  Zero overhang.  The servo circuit starts and stops the drivers on dime and gives ya nine cents change back.  Not to mention there few subs that can keep up with the P-Audio driver used in the famous Super V design.

Probably a good reason HAL is using them mated to NEO drivers which is my plan.

I have a sealed servo design subwoofer. What is the benefit of the open baffle in aiding the servo circuit in doing its thing, I wonder?

HAL

Re: The Monolith open baffle planar speakers
« Reply #68 on: 9 Jan 2018, 10:09 am »
An open baffle sub has a different sound radiation pattern into a room than box subs.

The open baffle H-Frame has a figure of 8 style sound radiation pattern, so very little sound at 90 degrees to the front, back or top.  That means less side wall and ceiling interaction with the subs.  All box subs either sealed or ported have an Omni radiation pattern so more sound hitting the sidewall and ceiling.  If you walk around each type of sub you will hear the difference. 

The servo sub controls the driver to make it act more as a piston for better frequency response and lower distortion.  Brian has shown a test box with a servo driver and servo amp at RMAF.  With the amp off, it is easy to move the cone.  With the amp on, no cone movement pushing on it as the servo is actively stopping any movement that is not the input signal. 

HAL

Re: The Monolith open baffle planar speakers
« Reply #69 on: 9 Jan 2018, 02:32 pm »
Modular 2x12 servo sub #2 is wired and running.   Test signal working fine, so both subs are complete.  Finishing will happen later.






HAL

Re: The Monolith open baffle planar speakers
« Reply #70 on: 11 Jan 2018, 07:57 pm »
Both HX300-8OB amps are headed to Rythmik Audio to be moded to HX300-12OB for the 2x12 subs.

Hope to have them back the end of January.

HAL

Re: The Monolith open baffle planar speakers
« Reply #71 on: 19 Jan 2018, 12:39 pm »
The update from Rythmik Audio today is they have received the HX300-8OB for mod to HX300-12OB and should be completed and shipped by Monday.

Should have them next week and start new measurements.



WC

Re: The Monolith open baffle planar speakers
« Reply #72 on: 19 Jan 2018, 08:43 pm »
So why did you use the HX300 instead of the A370PEQ amps? Were they originally bought for 8" subs?

HAL

Re: The Monolith open baffle planar speakers
« Reply #73 on: 19 Jan 2018, 09:21 pm »
Yes, getting mods for the new 2x12's.

HAL

Re: The Monolith open baffle planar speakers
« Reply #74 on: 20 Jan 2018, 01:28 pm »
Have a pair of Parasound Halo A23 stereo amps ready for the open baffle planar top when the HX300-12OB amps arrive for a triamp setup with the dspMusikLCD digital crossover being used with the MS-3 for the entire system to run The Monoliths.  The A23's sound great with the line arrays, so going in this system for trials as well.

The dspMusikLCD will allow time alignment of the top baffle and sub drivers using time delay for the top to match the subs.  This allows both wavefronts to align correctly. 


HAL

Re: The Monolith open baffle planar speakers
« Reply #75 on: 29 Jan 2018, 04:47 pm »
The HX300-12OB servo amps should be here from Rythmik Audio tomorrow.  Time to give the updated amps a try with the 2x12's. 

Then add the planar OB tops for some dspMusikLCD 2x8 digital crossover measurements, updates and listening!


HAL

Re: The Monolith open baffle planar speakers
« Reply #76 on: 31 Jan 2018, 12:50 am »
The Rythmik Audio HX300-12OB servo amps are here and warming up to room temp before opening the box.   Connecting after that to the dspMusikLCD 2x8 for testing with the sub cabinets.  Probably tomorrow as they need a few hours to warm up.



HAL

Re: The Monolith open baffle planar speakers
« Reply #77 on: 31 Jan 2018, 02:45 am »
The Rythmik Audio HX300-12OB servo amps arrived today and now installed with the subs.

Tomorrow will be testing with the dspMusikLCD 2x8 and see what happens.



HAL

Re: The Monolith open baffle planar speakers
« Reply #78 on: 31 Jan 2018, 12:44 pm »
Both HX300-12OB amps are running balanced inputs with the dspMusikLCD 2x8 and will be connecting up the measurement mic for trials. 

The test pink noise now sounds much smoother across the band now that they are correct for the subs. 

No hum from anything and no special connections to have them close to the source.  Love those balanced connections.

HAL

Re: The Monolith open baffle planar speakers
« Reply #79 on: 1 Feb 2018, 06:31 pm »
Next stage of the testing.  Add the OB planar top and see how it works.

The dspMusikLCD 2x8 crossover it working and now to make some new measurements with CLIO Pocket.