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RE: Magnepan LRS with two 1x12 OB subs and dspNexus 2/8 DSP control center

Posted by HAL2010 (M) on November 18, 2024 at 11:25:25

In Reply to: RE: Magnepan LRS with two 1x12 OB subs and dspNexus 2/8 DSP control center posted by MarcL on November 18, 2024 at 10:44:08:

I use the GR-Research drivers with custom EQ on the dspNexus and do not use the sense coils for the demo using original Orchard Audio Starkrimson monoblocks to drive the 1x12's. Since I only use the modular subs they are about 40lb each with the driver. Easier to move than the full 2x12 and higher driver arrays.

The servo amp does two basic things, first is use as a current output amp and second as a servo loop control with the sense coil. There is also a DC servo loop for the current amp. The sense coil needs correction to run the servo loop. I am using EQ to correct the driver in cabinet frequency response with a standard amp, no motional feedback.

There are other drivers for OB that would work in the OB H-Frame. One I have been told about is the Acoustic Elegance OB-12. They are about $600/driver so 2x the SW-12-16FR sub drivers. There are others that would fit the existing cabinet without modifications. They all require EQ to flatten the response for use.

I do not use NoRez in the OB H-Frame modular cabinets I have built from flat packs, so no way to compare before and after.

Any cabinet has resonances under acoustic drive. Instead of a frequency response, a waterfall stored energy plot would be better to see if there is any change in resonances. Should be able to do that with a groundplane measurement and possibly REW. MDF is usually chosen as well damped cabinet material. Subs are high SPL output, so more excitation to show if there is a problem area.
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