Ampeg Isovent - Jack Plate Circuit Board.

[Jim C]

You guys have been jumping down my back.

You want to make fun of me, you do so at your own peril, because I can return it any time any day of the week.

You like your Peavy and I like my Ampeg.

How about we leave it at that.

And while you guys have been making fun, you have offered Nothing of Value towards my moving forward with the Isovent project.

Renbranger and Aged Hourse plus maybe one or two others seem to know something and they are the only ones talking seriously while the rest of you have been posting stupid videos.

So you get what you get.

If you can't take it then don't dish it out.

Hey Pal,
In post 317 I spoke with respect and offered the test that we all had encouraged.
I find it disrespectful for you to blow this off as not happening.
I really wanted you to find the answer for yourself which seems doubtful.

 

[NKBassman]

You guys have been jumping down my back.

You want to make fun of me, you do so at your own peril, because I can return it any time any day of the week.

You like your Peavy and I like my Ampeg.

How about we leave it at that.

And while you guys have been making fun, you have offered Nothing of Value towards my moving forward with the Isovent project.

Renbranger and Aged Hourse plus maybe one or two others seem to know something and they are the only ones talking seriously while the rest of you have been posting stupid videos.

So you get what you get.

If you can't take it then don't dish it out.

so far you’ve ignored everything of value.

It's more like you want someone to agree with you rather than find an answer to your problem.

 

[Nicholas Orick]

I thought the advantage of Isobaric loading is it allowed designers to overcome the limitation of vintage drivers so they could produce deep bass with a relatively small cabinet. There was a trade off in efficiency and max SPL because only the radiating area of one driver couples with the room.

Modern drivers can be designed to give low response in small cab, so it is no longer considered an advantage to use isobarik loading. The isobarik cost more, weighs more, and has lower efficiency and max SPL.

Of course, I still think the Isovent is sort of a hybrid between an isobarik and a short tapped horn. But I believe it was made before the math to really understand and optimize tapped horns was widely known, and Ampeg may not have even treated it as a tapped horn.

I know the Isobaric approach may NOT be the Most Efficient, the Most this, or the Most that, and maybe in other ways it does have advantages, and disadvantages, but none of that matters.

The concept still does see useful applications today.

I like the concept for whatever it was, and may be today, and since I am more of a hobbiest, it actually doesn't matter if I play around with this, or that, or the third concept.

I am just having fun with it in the same way somebody might have fun taking and old B18 and refurbishing it.

It's just for fun, and Yes I would like for it to work well, and I think it will once we solve some problems, but since I am NOT a professional, it isnt Mission Critical in one sense, but important in another.

Where we are with the Isovent now is, the Crossover Circuit Board has been Removed, and a friend who has extensive experience working on sound gear for concerts, is rewiring the Isovent.

We discussed options, one we know will work, but a possible second concept which may or may NOT work.

Until we know for sure I am keeping it a surprise, it is Nothing Earth Shattering, and No the Ground ISN'T going to Crack in Two, and No the Sky ISN'T going to F

all, but an added idea furthering our initial idea, that maybe some of you will like.

First we have to see if the second option is physically possible. The first option will.work for sure.

And Thank You ALL for your Knowledge, Experience, Advise, and ALL the Crap.

Crap back to ALL of you also.

.

 

[Nicholas Orick]

so far you’ve ignored everything of value.

Actually I haven't.

I am taking this In Steps.

.

 

[Nicholas Orick]

 

[Nicholas Orick]

Hey Pal,
In post 317 I spoke with respect and offered the test that we all had encouraged.
I find it disrespectful for you to blow this off as not happening.
I really wanted you to find the answer for yourself which seems doubtful.

The Isovent is with a friend who has extensive experience working on speaker sounds systems.

I am NOT DisRespecting anybody.

My friend and I are taking this In Steps.

Relax.

 

[DJ Bebop]

And while you guys have been making fun, you have offered Nothing of Value towards my moving forward with the Isovent project.

Over 300 posts with ideas to help you with your original problem. If you don't try them, yes you are right, they are not of value and as you dismiss them you are not moving forward.

 

[Nicholas Orick]

If you had read my post on the Peavy. I sold that cab.

The so-called jumping down your back comes from. You came here, we didn't accost you on the streets.
You asked us for help and every time someone has told you what to look for. You say nah, that's not it but, what is it? We again tell you to try some things and again you tell us you know what it is and it's not what we say, without trying anything we have suggested.

Like when I tried to get you to try all of your speakers out of the box itself. Rather than leave some in as you test some outside the cabinet. The cabinet is a common point. You stopped responding to me when we got to the point where it was evident that some speakers were still attached to the cab. Your F-bomb could be a resonance problem. No acknowledgment.

I really don't care if you listen to me but, to dismiss what agedhorse has said is foolish. I wonder what you would think if you called Ampeg and they told you the same things. Would you dismiss them as well?

It's more like you want someone to agree with you rather than find an answer to your problem.

I have NOT Dismissed AgedHorse at all.

If it is the Cabinet Enclosure, my friend will find exactly where and how, and as I have said several times, we have already decided on a course of action, I am sure he will zero in on what could be causing the F Bomb, and in terms of AgedHorse, plus a couple of others, I have been enjoying their Perspective from all of his years experience in the field.

So you are Wrong on that assumption.

 

[DJ Bebop]

I have NOT Dismissed AgedHorse at all.

If it is the Cabinet Enclosure, my friend will find exactly where and how, and as I have said several times, we have already decided on a course of action, I am sure he will zero in on what could be causing the F Bomb, and in terms of AgedHorse, plus a couple of others, I have been enjoying their Perspective from all of his years experience in the field.

So you are Wrong on that assumption.

I can go only on your responses here. It seems I am not alone in my observations.

 

[Nicholas Orick]

Over 300 posts with ideas to help you with your original problem. If you don't try them, yes you are right, they are not of value and as you dismiss them you are not moving forward.

I have read through ALL of your responses.

As I have just said several times in recent posts, I absorbed what you all said, learned from it, I have taken the cabinet to a friend who has a lot of experience working on cabinets for large scale sound systems, we discuseed the issue, decided on a course of action, and if the F Bomb is because of this, or that, or the third thing, he will most assuredly track it down, and solve the problem.

In terms of ReWiring the Isovent, again we have decided on that, but there is one way we know will work for sure, but we also saw the another option which we are NOT yet sure can physically work, so until we know for sure, I am holding it a surprise for you all.

Until then you will have to be patient.

 

[agedhorse]

I see.

The basic box seems to be the best approach then.

I have a Bag End 18, which I like, and contrary to popular opinion, I am going to continue forging ahead with fixing up the Isovent, but later on after Other Obligations have been met, I have been toying around with the idea of using a B52 Folded Horn with my Ampeg SVP 1600. The power rating of both the SVP and B52 Folded Horn are just about identical.

I have always liked the sound of folded horns, I used to have a rig comprised of an Ampeg 4 Pro and B52 folded horn, and thought it was the coolest most awesome rig.

What do you think?

.

The SVP in stereo mode would be ok, but in bridge mono could fairly easily destroy it without much of a fighting chance.

Personally, I really do not like the sound or the limitations that a folded horn design brings to bass guitar. Again, there is a reason why there are very few (professional) companies making this type of cabinet. The ones that are used in pro audio are about 3x the size of the one you pictured, almost 48" deep with a long throat and larger mouth area. They are also used in multiples in order to extend the low frequency effectiveness of the horn.

 

[agedhorse]

I thought the advantage of Isobaric loading is it allowed designers to overcome the limitation of vintage drivers so they could produce deep bass with a relatively small cabinet. There was a trade off in efficiency and max SPL because only the radiating area of one driver couples with the room.

Modern drivers can be designed to give low response in small cab, so it is no longer considered an advantage to use isobarik loading. The isobarik cost more, weighs more, and has lower efficiency and max SPL.

Of course, I still think the Isovent is sort of a hybrid between an isobarik and a short tapped horn. But I believe it was made before the math to really understand and optimize tapped horns was widely known, and Ampeg may not have even treated it as a tapped horn.

Not much of a horn, not much of an isobaric either since it's really just a simple push-pull driver configuration. Certainly not a tapped horn.

The 210 on the top appears to be a conventional cabinet section built on top of this isovent concept.

The concept of push-pull drivers might be a viable concept if used in a conventional cabinet. Twice the motor strength, twice the moving mass, half the impedance but only 1x the surface area. It's kind of the same as a stronger motor, a VC with 1/2 the impedance and twice the moving mass. Kind of the hard way to skin that cat IMO.

 

[NKBassman]

I know the Isobaric approach may NOT be the Most Efficient, the Most this, or the Most that, and maybe in other ways it does have advantages, and disadvantages, but none of that matters.

The concept still does see useful applications today.

I like the concept for whatever it was, and may be today, and since I am more of a hobbiest, it actually doesn't matter if I play around with this, or that, or the third concept.

I am just having fun with it in the same way somebody might have fun taking and old B18 and refurbishing it.

It's just for fun, and Yes I would like for it to work well, and I think it will once we solve some problems, but since I am NOT a professional, it isnt Mission Critical in one sense, but important in another.

Where we are with the Isovent now is, the Crossover Circuit Board has been Removed, and a friend who has extensive experience working on sound gear for concerts, is rewiring the Isovent.

We discussed options, one we know will work, but a possible second concept which may or may NOT work.

Until we know for sure I am keeping it a surprise, it is Nothing Earth Shattering, and No the Ground ISN'T going to Crack in Two, and No the Sky ISN'T going to FView attachment 3680796 View attachment 3680799 View attachment 3680801 View attachment 3680802 View attachment 3680804 all, but an added idea furthering our initial idea, that maybe some of you will like.

First we have to see if the second option is physically possible. The first option will.work for sure.

And Thank You ALL for your Knowledge, Experience, Advise, and ALL the Crap.

Crap back to ALL of you also.

.

If you want to tinker on your own stuff, that’s all well and good. Have at it. Nobody here’s trying to stop you. We’re trying to help you tinker better.

Just curious what your budget is for ruining modifying this cab?

 

[BioWeapon]

I see.

The basic box seems to be the best approach then.

I have a Bag End 18, which I like, and contrary to popular opinion, I am going to continue forging ahead with fixing up the Isovent, but later on after Other Obligations have been met, I have been toying around with the idea of using a B52 Folded Horn with my Ampeg SVP 1600. The power rating of both the SVP and B52 Folded Horn are just about identical.

I have always liked the sound of folded horns, I used to have a rig comprised of an Ampeg 4 Pro and B52 folded horn, and thought it was the coolest most awesome rig.

What do you think?

.

I'm curious - what it is you like about the B-52? I ask that simply because it has a very limited frequency response that I would immediately assume doesn't sound too good on bass. 30-160hz is the manufacturer's spec.

... It's also 137 lbs

 

[NKBassman]

I'm curious - what it is you like about the B-52? I ask that simply because it has a very limited frequency response that I would immediately assume doesn't sound too good on bass. 30-160hz is the manufacturer's spec.
... It's also 137 lbs

lol that’s ridiculous

 

[Nicholas Orick]

I'm curious - what it is you like about the B-52? I ask that simply because it has a very limited frequency response that I would immediately assume doesn't sound too good on bass. 30-160hz is the manufacturer's spec.

... It's also 137 lbs

Okay a kind of strange thing happened to me. I was in the Army for many years, and at the time I went in, folks were doing things one way in music, but by the time I got out over a decade later, the whole paradigm had changed, only I didn't know it.

At the time I went in, players were still pretty much outfitting themselves with their own rigs, but by the time I got out, anything considered to be a rig had become basically a glorified stage monitor, with most bands opting for these more rapidly growing array sound systems. Now many musicians use IEMs, which you will Never see me use because I hate having things stuck in my ears.

Anyway the cabs on stage were becoming these light little boxes, which I thought were trash, and I determined myself to make a statemenot by getting something that was built like a Brick Squat House.

Further, going back many years, I just developed a strong affinity for folded horns, and whether or NOT folded horns are optimal this, fuel efficient that, and can crank out head splitting amounts of SPLs, I just like the Sound of Folded Horns.

Do Folded Horns Sound Perfect?

Who cares.

Folded Horns are just something I like.

I did at one point own a pair of Klipsch LaScallas for Stereo listening plus a B52 Folded Horn for playing bass.

All were stolen.

Now I am rebuilding.

Whereas the Active Self Powered B52 has a Crossover that limits its Reach, or Range, and therefore cuts it at something like 130 Hz, the Passive Folded Horn has No Crossover, and actually via the Transients running through the speaker cone, has quite a bit if Reach in Sound Range.

Additionally, I learned right away when playing in bands or groups of people, it is Okay to practice using a smaller Practice Amp, but when playing against a good strong drummer, Go Big.

For me the B52 Folded Horn fit the bill exactly.

So one day, when I had a little money, I walked into a GC, asked about a B52 Folded Horn, and when an Ampeg 3 Pro was NOT Strong Enough to Drive the B52, the 4 Pro was, and I walked out having purchased a B52 and 4 Pro.

As the saying goes, you have to learn the rules before you can break rules, and in having Defeated the Limiting Crossover, because there Was No Crossover, I got a really good Amplifier and Folded Horn combination that I really liked.

As far as weight goes, I worked in Armored Tanks in the Army, so weight wasn't an issue, especially with castors for rolling it around with.

Many think the sound waves don't mature right away. My experience has been, and others have confirmed this, that folded horns act like filters removing a whole lot of sound stuff for a while, and what tends to come out is sort of cleaner more purer bass sound waves, which to my mind are eerily clean.

I fully intend on getting another Passive B52 Folded Horn to go with my Ampeg SVP (the predecessor to the 4 Pro).

Originally back then I got the LX18 V2, but this time around, I am going to get the newer V3.

It's just a thing that I have for Folded Horns.

I just like them.

They Don't have to be Perfect.

They just have to be Folded Horns.

Then again - that's just me.

Everybody else obviously will prefer to choose what they like.

I choose a powerful strong B52 Folded Horn.

 

[BioWeapon]

Okay a kind of strange thing happened to me. I was in the Army for many years, and at the time I went in, folks were doing things one way in music, but by the time I got out over a decade later, the whole paradigm had changed, only I didn't know it.

At the time I went in, players were still pretty much outfitting themselves with their own rigs, but by the time I got out, anything considered to be a rig had become basically a glorified stage monitor, with most bands opting for these more rapidly growing array sound systems. Now many musicians use IEMs, which you will Never see me use because I hate having things stuck in my ears.

Anyway the cabs on stage were becoming these light little boxes, which I thought were trash, and I determined myself to make a message by getting something that was built like a Brick Squat House.

Further, going back many years, I just developed a strong affinity for folded horns, and whether or NOT folded horns are optimal this, fuel efficient that, and can crank out head splitting amounts of SPLs, I just like the Sound of Folded Horns.

Do Folded Horns Sound Perfect?

Who cares.

Folded Horns are just something I like.

I did at one point own a pair of Klipsch LaScallas for Stereo listening plus a B52 Folded Horn for playing bass.

All were stolen.

Now I am rebuilding.

Where as the Active Self Powered B52 has a Crossover that limits its Reach, or Range, and therefore cuts it at something like 130 Hz, the Passive Folded Horn has No Crossover, and actually via the Transients running through the speaker cone, has quite a bit if Reach in Sound Range.

So one day, when I had a little money, I walked into a GC, asked about a B52 Folded Horn, and when an Ampeg 3 Pro was NOT Strong Enough to Drive the B52, the 4 Pro was, and I walked out having purchased a B52 and 4 Pro.

As the saying goes, you have to learn the rules before you can break them, and in having Defeated the Limiting Crossover, because there Was No Crossover, I got a really good Amplifier and Folded Horn combination that I really liked.

Many think the sound waves don't mature right away. My experience has been, and others have confirmed this, that folded horns act like filters removing a whole lot of sound stuff for a while, and what tends to come out is sort if cleaner more purer bass sound waves, which to my mind are eerily clean.

I fully intend on getting another Passive B52 Folded Horn to go with my Ampeg SVP (the predecessor to the 4 Pro).

Originally back then I got the LX18 V2, but this time around, I am going to get the newer V3.

It's just a thing that I have for Folded Horns.

I just like them.

They Don't have to be Perfect.

They just have to be Folded Horns.

Then again - that's just me.

Everybody else obviously will prefer to choose what they like.

I choose a powerful strong B52 Folded Horn.


View attachment 3680890

Hey, if it works, then more power to ya There's actually six Acoustic 360/361 folded horn reissue rigs in the classifieds right now if that's your cup of tea - they're not exactly cheap but they come from a major stadium-touring artist!

 

[frankie5string]

NOT knocking Peavy but I'd take an Ampeg Isovent any day of the week.

This Peavy doesn't have half the power.View attachment 3680711 View attachment 3680712 View attachment 3680713 View attachment 3680714 View attachment 3680715 View attachment 3680716

Actually, the Peavey cabinet might be louder and clearer than the isoVent.
I've used them before and they are very loud sounding speakers. It has a lot of midrange "colour" that makes it seem more sensitive. It also had none of the gross, whiny low-mids the Ampeg cab had. You really didn't have to jam a massive amount of power into it to make it loud.

I also feel that they're built better, mechanically.

 

[Wasnex]

Okay a kind of strange thing happened to me. I was in the Army for many years, and at the time I went in, folks were doing things one way in music, but by the time I got out over a decade later, the whole paradigm had changed, only I didn't know it.

At the time I went in, players were still pretty much outfitting themselves with their own rigs, but by the time I got out, anything considered to be a rig had become basically a glorified stage monitor, with most bands opting for these more rapidly growing array sound systems. Now many musicians use IEMs, which you will Never see me use because I hate having things stuck in my ears.

Anyway the cabs on stage were becoming these light little boxes, which I thought were trash, and I determined myself to make a statemenot by getting something that was built like a Brick Squat House.

Further, going back many years, I just developed a strong affinity for folded horns, and whether or NOT folded horns are optimal this, fuel efficient that, and can crank out head splitting amounts of SPLs, I just like the Sound of Folded Horns.

Do Folded Horns Sound Perfect?

Who cares.

Folded Horns are just something I like.

I did at one point own a pair of Klipsch LaScallas for Stereo listening plus a B52 Folded Horn for playing bass.

All were stolen.

Now I am rebuilding.

Whereas the Active Self Powered B52 has a Crossover that limits its Reach, or Range, and therefore cuts it at something like 130 Hz, the Passive Folded Horn has No Crossover, and actually via the Transients running through the speaker cone, has quite a bit if Reach in Sound Range.

Additionally, I learned right away when playing in bands or groups of people, it is Okay to practice using a smaller Practice Amp, but when playing against a good strong drummer, Go Big.

For me the B52 Folded Horn fit the bill exactly.

So one day, when I had a little money, I walked into a GC, asked about a B52 Folded Horn, and when an Ampeg 3 Pro was NOT Strong Enough to Drive the B52, the 4 Pro was, and I walked out having purchased a B52 and 4 Pro.

As the saying goes, you have to learn the rules before you can break rules, and in having Defeated the Limiting Crossover, because there Was No Crossover, I got a really good Amplifier and Folded Horn combination that I really liked.

As far as weight goes, I worked in Armored Tanks in the Army, so weight wasn't an issue, especially with castors for rolling it around with.

Many think the sound waves don't mature right away. My experience has been, and others have confirmed this, that folded horns act like filters removing a whole lot of sound stuff for a while, and what tends to come out is sort of cleaner more purer bass sound waves, which to my mind are eerily clean.

I fully intend on getting another Passive B52 Folded Horn to go with my Ampeg SVP (the predecessor to the 4 Pro).

Originally back then I got the LX18 V2, but this time around, I am going to get the newer V3.

It's just a thing that I have for Folded Horns.

I just like them.

They Don't have to be Perfect.

They just have to be Folded Horns.

Then again - that's just me.

Everybody else obviously will prefer to choose what they like.

I choose a powerful strong B52 Folded Horn.


View attachment 3680890

The B52s are sort of a crappy clone of the Cerwin Vega EL36 Earthquake. If you want a small folded horn, I suggest you consider the JTR Growler. The Growlers are very smooth. The B52s and Cerwin Vegas are commonly called one note wonders.
[Invalid or Expired Link Removed]

The Growlers are respected and have competed well in some noteworthy subwoofer shootouts. They have comparable output to JBL SRX718S and VRX918s. If you don't know, the SRX718S and VRX918S are pretty much the same sub, except the VRX has integral rigging hardware.

I was really interested in buying some Growlers as I like horn loaded cabs as well. But if I do buy subs, I will go with the JBLs as they will have better resale value.

 

[Jim C]

Over 300 posts with ideas to help you with your original problem. If you don't try them, yes you are right, they are not of value and as you dismiss them you are not moving forward.

You know, I almost always route for the underdog.
But, they are always very grateful for any help and willing to try things; other than complain.
OTOH, I can watch a train wreck when it's called for