Musical monitor: Some comments on the positive input in the original thread - diyAudio
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Musical monitor: Some comments on the positive input in the original thread

Posted 7th July 2012 at 04:45 AM by fas42
Updated 16th July 2012 at 12:21 AM by fas42

By tnargs:

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I was assuming we were going to take something like a Behringer 2031A (2 way, 8", active, affordable) and see what tweaks are on the table.
Most perceptive ...

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Whenever I see a measured FR of a Behringer it looks nice and smooth and flat, off axis too, so it seems a decent start.
Exactly so.

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Although Lynno's post is true enough, I thought we would be keeping the drivers and looking at any gains from astute use of felt or resin (on or around the cone/dome), replacement of dust cap, stiffening or dampening the pressed steel driver frame... what else?
Possibly will improve the frame in some such fashion; and look at stronger coupling of the whole driver assembly to the carcase such that vibration is transferred in the most direct path to the surface the monitor is sitting on.

But these things will be only addressed after the electronics are sorted out, and I see how well the driver behaves itself at maximum SPLs.

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The cabinet. Anything to gain from spikes? How about those 2 slots it uses instead of a round port.... is it an improvement on a traditional port or better blocked and a trad port put on the back? How about building a stiffening matrix into the cabinet without taking away critical volume? Or even glue/screw heavy duty plates on the outside of the cabinet? Is it an idea to put large radius closed cell foam or cardboard curves on the sides top and bottom of the cabinet to prevent reflections of radial energy?
All excellent ideas. The carcase is very stiff, inert, in its raw state, so again will see how well this side of things holds up when the dynamics are sufficiently improved.

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I don't know what we would see when we open up the electronics, probably a single small PSU, two IC power amp modules and definitely a LR4 line level crossover. Maybe the PSU is a bit light on caps? How about adding a separate PSU for the tweeter? And another for the line level crossover? Is there a critical cap or two that could be changed to PP? Are any IC's upgradable and will it help? How about moving all the electronics out of the cabinet and away from that energy intensity?
Every point there is right on the money. My feeling is that the ICs are adequate, but will have poor intrinsic PSRR, so heavy local bypassing or equivalent will be necessary.

The electronics are already outside the cabinet; they're mounted on the back, to a coverplate/heatsink. Which is screwed very simply to the rear panel. So plenty of room for experimentation in assessing sensitivity to vibration, and adding damping arrangements if there is an audible problem ...

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But then the OP let it peter out, but I am quite interested so thought I would toss some ideas in the fire. Am I on a sane path here?
Probably the sanest person who responded on this thread , ...

Frank
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