Okay here is my Honest Opinion.
After testing an Ampeg Folded Horn last weekend, which seemed to be a little Intense around C3, basically what I think is, these cabinets aren't perfect, and maybe relative to Better Balanced gear, it becomes a bit more noticable when the sound either diminishes or intensifies in these older cabs.
Yes the removal of the circuitry seems to have done something, but in all Honesty, this Isovent seems to be a little E and F Centric, with a bit of added vibrancy in this region, and after the past week or so, I have gotten to the point where I just Don't Give a Crap Anymore.
It is just the way these cabs are.
When initially testing, I used the Mesa Walkabout with all EQ settings at the 12 O'clock, and yes the Isovent seemed somewhat more balanced, but I will be Honest in saying, the Es and Fs do ringout with a bit of unusual vibrancy than with maybe more normal cabinets.
So you guys Win, anyway to a degree, but NOT entirely because the removal of the circuitry did have an effect, and the Isovent does seem a little more balanced than before.
What is the upshot of all this?
Besides taking some flak from you guys, and learning something useful, what exactly I don't know, I have sort of an idea of what I am going to do going forwards.
You guys kept recommending a Parametric EQ and HPF.
As it happens, the Rolls Parametric has both, and for a minimal investment, I can get one of these, and use it.
I probably will.
Now remember the Walkabout has a Semi Parametric EQ, which I quickly adjusted towards giving me an idea of what to do, but the Rolls offers a far greater amount of surgical precision, so after taking care of something in the very near future, I will get a Rolls RPQ and try that.
Maybe later on I will try using one of these advanced new digital power amps just as a learning toy.
I sometimes do this.
For having around the house, or maybe taking it over to a friend's place for practice, the Isovent will work well.
Given this experience, one thing this Isovent has done is to further develop Keener Ears, which means I will probably be a much harder sell when considering plunking down some serious money on Some Serious New Gear.
I will admit many of these Newer Speaker Sound Systems are better balanced, and via new advancements via digitial control, have produced newer capabilities which I think maybe many today just take for granted. In other words, when something sounds good - nobody notices, but it is only when something sounds Bad that people tend to notice, and this actually becomes a good useful learning tool for Developing Ears.
As it stands now, the Isovent is here at home with my wife and I, as currently dialed in sounds good, and it actually tends to bring out a good quality of my bass when playing through it.
After this exhaustive week to 10 days with all if you, I am just NOT going to sweat it, I think as dialed in it sound reasonably good, and currently I have some important Irons in the Fire to attend to.
You will be surprised.
As to the Switch Jacks, for Safety's Sake, more than anything else, my friend chose to use one Switch Jack, and NOT two, so that NO Accidents happen. If one plugs into the right most jack, the Isovent is put into Full Mode, and if plugged into the left jack, the the Isovent it put into Sub only Mode, and in this way there is always a load that the amplifier will see.
And that's it. I now have my basic ol' Isovent, and aside from playing around with a Para EQ, and probably maybe down the road, with a more advanced digitial amplifier, this is our Isovent.
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