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Ampeg Isovent - Jack Plate Circuit Board.
- Thread starter Nicholas Orick
- Start date
- Status
C'mon, we've been following this b.s. long enough. Can the People In Charge shut down this thread? Is the OP mentally challenged? Weird capitalizations and an obstinate refusal to accept reality-based criticisms tell me that the OP is "not all there" OR is a troll. Either way, this thread is ridiculous and we should all ignore it.
And by the way, I mean no disrespect to the OP. Dude, this cabinet is a dud, let it go, no one ever liked it, buy a decent cab that's designed meet to your needs.
And by the way, I mean no disrespect to the OP. Dude, this cabinet is a dud, let it go, no one ever liked it, buy a decent cab that's designed meet to your needs.
Wow...
Its been a while since I have read a thread this good/bad...
Its been a while since I have read a thread this good/bad...
I already have Real Bass Cabs.
I am just having some Fun trying to see what can be done with the Isovent.
Oh and by the way, some of the so called Real Bass Cabs I find Boring.
How many 4x10s and 8x10s, or 1x15 or 2x15s, and so on are out there?
A zillion of them.
I think this Isovent is an UnUsual Design and I am having fun with it.
If you guys don't like it - that is your problem. Jump onto Other Threads and let the guys who are really interested in the Isovent stay on.
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DJ Bebop asked if you had ever had all the drivers out of the cabinet on any of the F’n Bomb tests and you said no. So you have mentally locked onto the crossover board as the resonance problem because you see the wires all
coming from there.
But you seem to be ignoring the fact that during any of the F’n Bomb tests, at least two speakers were in the cab...possibly exciting the resonance you are hearing. Thus DJ Bebop’s repeated suggestion of a wood flaw or void, or a glue joint breaking down.
Or just a cab design issue. Never tried an Isovent myself.
So if you ever get that thing wired up with the crossover removed and find it’s still F-ing you up, pull ALL the speakers out and listen to them completely independent of the box.
Until you get those things done, we’re all pretty much pointlessly F-ing around on this thread. We’ve already established all we can and are now starving for actionable information.
coming from there.
But you seem to be ignoring the fact that during any of the F’n Bomb tests, at least two speakers were in the cab...possibly exciting the resonance you are hearing. Thus DJ Bebop’s repeated suggestion of a wood flaw or void, or a glue joint breaking down.
Or just a cab design issue. Never tried an Isovent myself.
So if you ever get that thing wired up with the crossover removed and find it’s still F-ing you up, pull ALL the speakers out and listen to them completely independent of the box.
Until you get those things done, we’re all pretty much pointlessly F-ing around on this thread. We’ve already established all we can and are now starving for actionable information.
I have and use an Isovent and I like it.
Sure, it's old, out of production and by today's standards not efficient or modern or anything, but it's special. Kinda like this:
Anyway, carry on and good luck.
Sure, it's old, out of production and by today's standards not efficient or modern or anything, but it's special. Kinda like this:
Anyway, carry on and good luck.
@Nicholas Orick
I'm starting to get the impression that your interests lie more with tinkering than they do with actively playing the gear you have. Which is totally fine. Many folk here like to tinker with their gear in one way or another and enjoy sharing their experiences.
But you started this thread by asking questions about how to make a bad sounding cabinet sound better, got a whole bunch of answers from very reputable members of this forum, and have adamantly refused to listen to any of it. You insist that you know where the problem lies, even though it's clear that you have no experience in even rudimentary speaker or audio circuit design. Meanwhile, you're getting answers from folks who have literally made it their life's work to design and implement infinitely more complicated systems than this relatively simple speaker cabinet.
Due to the Commercial User Policy, @agedhorse is probably not allowed to toot his own horn, but beyond the experience that he's already shared in this thread, he's also designed amps and cabs with Mesa Boogie and Genz Benz just to name a few. I'm thankful every day for the knowledge and expertise he tirelessly shares here, for free. He's an invaluable technical resource with decades of experience in exactly this field, and simply doesn't give bad advice. Period.
So what really is the point here? Are you looking for realistic answers and solutions to your problem, or just sharing your experience? If the former, then please take the good advice you've been offered in the spirit it was given. If the latter, then carry on. But asking questions and then blatantly ignoring the answers because they don't suit your preconceived notions isn't a good look for anybody.
All that being said, I'm looking forward to seeing where this ends up. Please carry on.
I'm starting to get the impression that your interests lie more with tinkering than they do with actively playing the gear you have. Which is totally fine. Many folk here like to tinker with their gear in one way or another and enjoy sharing their experiences.
But you started this thread by asking questions about how to make a bad sounding cabinet sound better, got a whole bunch of answers from very reputable members of this forum, and have adamantly refused to listen to any of it. You insist that you know where the problem lies, even though it's clear that you have no experience in even rudimentary speaker or audio circuit design. Meanwhile, you're getting answers from folks who have literally made it their life's work to design and implement infinitely more complicated systems than this relatively simple speaker cabinet.
Due to the Commercial User Policy, @agedhorse is probably not allowed to toot his own horn, but beyond the experience that he's already shared in this thread, he's also designed amps and cabs with Mesa Boogie and Genz Benz just to name a few. I'm thankful every day for the knowledge and expertise he tirelessly shares here, for free. He's an invaluable technical resource with decades of experience in exactly this field, and simply doesn't give bad advice. Period.
So what really is the point here? Are you looking for realistic answers and solutions to your problem, or just sharing your experience? If the former, then please take the good advice you've been offered in the spirit it was given. If the latter, then carry on. But asking questions and then blatantly ignoring the answers because they don't suit your preconceived notions isn't a good look for anybody.
All that being said, I'm looking forward to seeing where this ends up. Please carry on.
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- Feb 12, 2006
- 61,038
- 5
- 220,969
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
This thread highlights the difference between fact and opinion. Where opinion is stated as fact, and where factually the opinion is simply incorrect, there becomes conflict.
For those who are interested in facts, that's what I try to present.
When I am providing an opinion, I am clear that it's an opinion, of that there may be different valid conclusions.
For those who are interested in facts, that's what I try to present.
When I am providing an opinion, I am clear that it's an opinion, of that there may be different valid conclusions.
So, on these Isovent cabs, the bottom 15s are face-to-face, bolted together? Therefore wired out of phase with one another so the cones move in the same direction, causing an additive effect?
Or are they installed face to face but not touching, wired in phase but blowing (together) into a shared “vent?”
I ask because I have not seen one and can’t quite tell from the pics early in the thread. Either way, one wonders if the speaker polarity is correct. Couldn’t that issue cause some screwy resonance peaks in this cab design?
Hope I haven’t derailed the stately procession of diagnostics here with this spitballing question, but I am getting antsy for some definitive feedback from the OP and had to fill the vacuum.
Or are they installed face to face but not touching, wired in phase but blowing (together) into a shared “vent?”
I ask because I have not seen one and can’t quite tell from the pics early in the thread. Either way, one wonders if the speaker polarity is correct. Couldn’t that issue cause some screwy resonance peaks in this cab design?
Hope I haven’t derailed the stately procession of diagnostics here with this spitballing question, but I am getting antsy for some definitive feedback from the OP and had to fill the vacuum.
You're correct, the two 15s should be out of phase from each other in order to be working properly. I've never used an isobaric cab, but I suspect if they were in phase the whole thing would sound even worse than it does already.
Nicholas,
I have no issues with you wanting to use this cabinet, or for wanting something esoteric even though performance is compromised. Nothing wrong with being original.
I think our frustration is your trouble shooting techniques.
IMO, you are not eliminating enough possibilities per test.
By keeping anymore than one speaker connected to the amplifier, or by keeping ANY speaker in the cabinet, you have not eliminated enough variables.
If you choose to continue testing, my advice would be to take one speaker at a time, outside of the cabinet, and not connected to anything else.
Then play your bass at a reasonable volume.
Do this individual test with each driver.
If they all perform well, the problem is not the drivers.
IMO, the next step would be to look for issues in the cabinet.
I think you have a simple problem to fix that has become harder by going down a wrong path.
I worked with an SAE certified line mechanic back in the day who rebuilt a reasonably complicated Quadrajet carburetor on a car with a rough idle / poor acceleration. I think he was most motivated by the complexity of the repair and his ability to beat the time allowed to rebuild.
Turned out to be a cracked rubber vacuum line that leaked when it got hot.
It was a legit shop so the customer was charged for a 1 hour evaluation and a new piece of rubber line.
The mechanic did not get paid for the 1/2 day he wasted on the carb rebuild.
We all learned a valuable lesson about clear, step by step, and careful troubleshooting that day.
I have no issues with you wanting to use this cabinet, or for wanting something esoteric even though performance is compromised. Nothing wrong with being original.
I think our frustration is your trouble shooting techniques.
IMO, you are not eliminating enough possibilities per test.
By keeping anymore than one speaker connected to the amplifier, or by keeping ANY speaker in the cabinet, you have not eliminated enough variables.
If you choose to continue testing, my advice would be to take one speaker at a time, outside of the cabinet, and not connected to anything else.
Then play your bass at a reasonable volume.
Do this individual test with each driver.
If they all perform well, the problem is not the drivers.
IMO, the next step would be to look for issues in the cabinet.
I think you have a simple problem to fix that has become harder by going down a wrong path.
I worked with an SAE certified line mechanic back in the day who rebuilt a reasonably complicated Quadrajet carburetor on a car with a rough idle / poor acceleration. I think he was most motivated by the complexity of the repair and his ability to beat the time allowed to rebuild.
Turned out to be a cracked rubber vacuum line that leaked when it got hot.
It was a legit shop so the customer was charged for a 1 hour evaluation and a new piece of rubber line.
The mechanic did not get paid for the 1/2 day he wasted on the carb rebuild.
We all learned a valuable lesson about clear, step by step, and careful troubleshooting that day.
Sorry, I do not know tanks or their parts.
Used this diagram from File:M1 Abrams-TUSK.svg - Wikipedia and will refrain from further Tank Talk.
Have I got a cab for you.
Click> Bass Cabinets Archives - Genzler Amplification
These ARE MADE for BASS. Available in a single 10, 12, 15, two 10's or four 10's all with the Linearray taking care of the mids and highs while the woofer booms the bass. These will keep your sound on axis almost anywhere.
Use a single box or stack them. Makes a neat arc when stacked.
Good suggestionHave I got a cab for you.
Click> Bass Cabinets Archives - Genzler Amplification
These ARE MADE for BASS. Available in a single 10, 12, 15, two 10's or four 10's all with the Linearray taking care of the mids and highs while the woofer booms the bass. These will keep your sound on axis almost anywhere.
Use a single box or stack them. Makes a neat arc when stacked.
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- Status
