The new HAL AGN open baffle planar line arrays begin

HAL · July 08, 2021, 01:22:41 PM

Building a new design open baffle planar line array with the new planars in house. These are moded from the first pair of drivers to a lower impedance of 9 Ohms. This lets me drive a pair in parallel with monoblocks. The baffles to make the first pair arrived today and in the picture.

The crossover to begin with will be the dspMusik 2x8. This will drive the 3 pairs of monoblocks with long XLR cables and short speaker cables.

The response should be 250Hz to 20KHz from the line array and a pair of 3x12 OB H-Frame servo subs for 250Hz down.

Will be moved to the audio room for planar installation and testing before disassembly. Will get an automotive style finish when ready.

Nick B · July 08, 2021, 01:38:35 PM

Hi Rich,
How tall will these be and what size is the bottom platform? Also, what was the prior impedance?
Nick

HAL · July 08, 2021, 03:25:14 PM

Quote from: Nick B on July 08, 2021, 01:38:35 PM
Hi Rich,
How tall will these be and what size is the bottom platform? Also, what was the prior impedance?
Nick

Nick,
They are 6'1" tall and 18"w x 29"d for the base.

The original planar drivers are 20 Ohms.

Nick B · July 08, 2021, 04:15:36 PM

Quote from: HAL on July 08, 2021, 03:25:14 PM
Quote from: Nick B on July 08, 2021, 01:38:35 PM
Hi Rich,
How tall will these be and what size is the bottom platform? Also, what was the prior impedance?
Nick

Nick,
They are 6'1" tall and 18"w x 29"d for the base.

The original planar drivers are 20 Ohms.

Thanks, Rich. I'll admit to knowing virtually nothing about technical specs sometimes, but I can't say I ever recall having seen anything regarding 20 ohms.

HAL · July 08, 2021, 06:05:39 PM

That is more in the range of planar headphones impedance than for home speakers. That is why I asked for the moded drivers.

Nick B · July 08, 2021, 06:38:36 PM

Quote from: HAL on July 08, 2021, 06:05:39 PM
That is more in the range of planar headphones impedance than for home speakers. That is why I asked for the moded drivers.

Thanks, Rich. Just learned a little more tonight

tmazz · July 08, 2021, 08:46:42 PM

How many drivers are you gong to put in those frames?

HAL · July 09, 2021, 03:48:59 AM

tmazz,
There will be 6 planar drivers per array.

Those 6 planar drivers weigh 30lbs.

S Clark · July 09, 2021, 10:37:28 AM

A set of two in series X three sets in parallel?

HAL · July 09, 2021, 11:03:18 AM

Two of the planars are in parallel with one monoblock output. The monoblocks are setup for a 4 Ohm load, so the pair will be 4.5 Ohm. This will let me have minimum speaker cable lengths to all drivers from the amps.

Each pair of drivers will have different input signal time delays for the beamforming capability.

The amp inputs are all balanced XLR's for longer signal cable runs and no ground loops.

S Clark · July 09, 2021, 12:13:17 PM

Of course, I knew you wouldn't hook them up to a stereo amp like most of us troglodytes with our single amp and preamp. What was I thinking?

P.I. · July 09, 2021, 02:47:15 PM

Quote from: S Clark on July 09, 2021, 12:13:17 PM
Of course, I knew you wouldn't hook them up to a stereo amp like most of us troglodytes with our single amp and preamp. What was I thinking?

Yep, that's Rich!

HAL · July 10, 2021, 11:56:01 AM

Well, I got it down to 8 DAC channels instead of 12 DAC channels! Progress!

HAL · August 01, 2021, 09:36:35 AM

The first pair of HAL AGN Line Array open baffle planar speakers are now ready for wiring and testing.

After testing is complete, they are off to have the metallic paint finish applied.

RMAF2021 is about 2 months away!

HAL · August 05, 2021, 07:59:39 AM

The AGN Line Array's are connected and operational.

The dspMusik 2x8 is driving three pair of Orchard Audio original BOSC (now Starkrimson) amps. They are being used with two 3x12in OB servo subs. The lower half of the two 6x12in OB servo sub arrays.

Now for some speaker measurements and crossover tweaking. Even with a modified Magnetar DSP crossover they sound really good.