Ampeg Isovent - Jack Plate Circuit Board.

[Wasnex]

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Okay then where is the F-ing BOOM is coming from?

Why is the BOOM in both the 210s and 215s even when the 215s are NOT in the cabinet?

I even tried changing the separation and mass of the subs to No Avail.

The F Bomb is still Going BOOM!!!

.

Look we have stated what we think and you have said you don't believe us and proposed and experiment to prove what you believe. IMHO since you have disassembled the cab, there is really nothing more you can do, so you should drop the matter until you can get the components you need to run your experiments. Otherwise people are just going to continue telling you what you don't want to hear.

My question is what will you do if the boom is still there without the crossover?

 

[lokikallas]

I don’t mean to pile on, but from reading the whole thread the following myths keep getting repeated by the OP.

The idea of 15’s for bass, and 10s are for mids.
The circuit board is somehow effecting the resonance despite it simply being a solder point to make a clean parallel connection. It also happens to be where the crossover is soldered on.
Eq shouldn’t be subtractive.
You can make a silk purse from a sows ear.

If Agedhorse posts something about amplifier or transducer design, you can take that to the bank my friend.

 

[Nicholas Orick]

-Do you know what the terms FOH and PA mean and know their role in live music events?

-As others have said, the crossover you have has nothing at all to do with the 10” or 15” drivers. It is only for the tweeter. Period.

-Perhaps the reason the cab is no longer manufactured might have something to do with it’s a lousy cab?

Front Of House and Public Address.

This is the Metallica FOH & PA System.

By the way, before Metallica got Really Big they were using Ampeg Isovent speaker cabs.

What else you got?

You ALL still haven't solved the problem.

I am going to tell my friends that You ALL Busted my chops but I Stumped you all - On The Problem.

We'll see who wins.

.

 

[Coolhandjjl]

Front Of House and Public Address.

This is the Metallica FOH & PA System.

By the way, before Metallica got Really Big they were using Ampeg Isovent speaker cabs.

What else you got?

You ALL still haven't solved the problem.

.

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You sure showed us then. Guess we’re not needed then. But I do rekon’ that big set up pictured is still high-passed between 60Hz and 80Hz.

Over and out.

 

[BigBigGuy44]

I love a good troll.

 

[40Hz]

I like the Isovent, I intend on getting it Dialed In the way I wanted it, and I am Keeping It.

...one way or another I am going to get the Isovent Dialed In the way I want it.

I am going to get the Isovent Dialed In the way I want it. I have Dialed In many pieces of gear and I think I can successfully get this Isovent Dailed In the way I want it. It is just a matter of figuriing out and separating what Needs to be done from what Doesn't Need to be done, and then getting it Done

This has got to be one of the most amazing circular discussions I’ve ever seen in this forum.

 

[thetragichero]

You ALL still haven't solved the problem.

I am going to tell my friends that You ALL Busted my chops but I Stumped you all - On The Problem.

We'll see who wins.

with all due respect I'm pretty sure none of us can solve your resistance to reality. i hope you cross that bridge and join us. it's much simpler and i haven't disassembled any cabs today

 

[seamonkey]

Um Er - OP here,

What are you talking about?

.

Just trying to help you out.
If you use regular 440hz tuning it can be very unhealthy
See: Music Tuned to 440 Hz Versus 432 Hz and the Health Effects: A Double-blind Cross-over Pilot Study. - PubMed - NCBI

Best to use 432hz, much more healthier

440hz was established back when they were trying to 2 concerts in a day. They could fit in a afternoon matinee by tuning to 440hz as the music was faster. It gave musicians longer breaks between shows. It's just unhealthy. Gave people heart attacks. The even let people smoke in concert halls back in the day when 440hz was picked. Bass players smoked cigars and pipes.

Re-tune to a new pitch and "F" will no longer be your problem.

& (everybody should know)

 

[frankie5string]

We are not actually here to solve your problems, but many of us have told you the problem is not one part or one aspect, but the entire cabinet.

The IsoVent experiment was interesting, but it was basically misplaced and deemed a failure to Ampeg. There is no technical "fix" ... Ampeg's fix for it was to discontinue it and relegate it to a footnote in their product engineering history.

If you really want to keep going and the only thing that bothers you is that F note, the frequency for that F above the low E is around 44Hz. Put the control plate back together, then buy or find a parametric EQ rack unit to run between the SVP and the power amp. Dial in 44Hz on the frequency knob, and then use the boost/cut control to cut it by 12 or more dB. Just rip that frequency right out. If you like it, then you've essentially "fixed" it for you. Put a dab of glue on the para-EQ controls so they never move and throw it into your rack as a dedicated processor for that speaker.

Done.

 

[DJ Bebop]

Now since you know so much then WHAT on this Crossover Board is causing the F Bomb?

And with a bit of Extreme Humor I say - NOW Answer The F-ing Question!!!

Nothing.
Nothing on that crossover is causing the F Bomb.

 

[Nicholas Orick]

with all due respect I'm pretty sure none of us can solve your resistance to reality. i hope you cross that bridge and join us. it's much simpler and i haven't disassembled any cabs today

With all due respect, I am going to take the Jack Plate and Schematic Diagram to a friend, and while I am at work doing my job, have him ReWire the Jack Plate minus the Crossover Circuit Board, and see what this does.

What you all have said is the Crossover is NOT part of the equation, when the 210s and 215s are connected to the Crossover Board, but at least this way we can fully Exclude the Crossover Circuit Board.

If this Does NOT Solve the problem, then I will see what I learn, and reconsider the problem.

Anyway Thanks for all of your help in this matter, anyway as far as it went, and thanks for the Good Humor along the way.

I hope you all realize I was chuckling as the bantering went back and forth and I was only being funny and meant nothing by it.

.

 

[crazyBassClown]

I love a good troll.

Expert level, when you can't quite be sure one way or the other.
But what the hell, I have time to kill.

 

[crazyBassClown]

You ALL still haven't solved the problem.

We did solve your problem. You just don't like the solution.

 

[DJ Bebop]

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Okay then where is the F-ing BOOM is coming from?

Why is the BOOM in both the 210s and 215s even when the 215s are NOT in the cabinet?

I even tried changing the separation and mass of the subs to No Avail.

The F Bomb is still Going BOOM!!!

.

Maybe the plywood (if used) has separated or has voids. Or a glue joint has come undone.
It is not that funky crossover.

 

[TakeABreak]

Sounds more like a room acoustics issue than a cab issue.
Listening Room Acoustics: Room Modes & Standing Waves Part I

 

[crazyBassClown]

frequency for that F above the low E is around 44Hz.

To bring this back to reality for a sec, 88Hz is probably more likely the problem frequency than 44, and 132 is also a possibility.
But what am I thinking honestly...

 

[frankie5string]

To bring this back to reality for a sec, 88Hz is probably more likely the problem frequency than 44, and 132 is also a possibility.
But what am I thinking honestly...

True... he could get a multi-frequency unit and play with various frequencies and notch them out. That should keep him busy long enough to put an end to this thread... ;-)

 

[DJ Bebop]

By the way, before Metallica got Really Big they were using Ampeg Isovent speaker cabs.

What else you got?

Are they still using them now?

 

[DJ Bebop]

To bring this back to reality for a sec
But what am I thinking honestly...

 

[Nicholas Orick]

Look we have stated what we think and you have said you don't believe us and proposed and experiment to prove what you believe. IMHO since you have disassembled the cab, there is really nothing more you can do, so you should drop the matter until you can get the components you need to run your experiments. Otherwise people are just going to continue telling you what you don't want to hear.

My question is what will you do if the boom is still there without the crossover?

I don't know.

Something is causing the F Bomb and I am curious to know what it is.

I will cross that bridge when I get to it.

.