Ampeg Isovent - Jack Plate Circuit Board.

[Coolhandjjl]

What is the purpose of Limiting and the use of the bulb?

It protects the tweeter only. The BFM cabs I’ve built used fuse style lamps as tweeter protection. First time I’ve seen a bulb style used

 

[Coolhandjjl]

What do Inductors and Caps do?

Inductors are sometimes called coils or chokes, and capacitors are sometimes called caps or condensers. In this application, those components are what are used to allow certain frequencies to pass, and allow others to be blocked. It’s how crossovers are designed. It can be as simple as one cap or one coil, all the way to a board chock-full of components.

In simple terms, if you want to lo-pass a woofer, IOW, send only frequencies below a certain Hz thereby blocking everything above, a coil would do.

If you wanted to hi-pass a tweeter, IOW send only frequencies above a certain Hz thereby blocking everything below, a cap is used.

 

[seamonkey]

It's obvious the OP has a problem where the Isovent is not in alignment with heartbeat of our planet.
432Hz tuning is the answer. It will no longer be an F...Bomb.

 

[Wasnex]

This diagram answered a question.

The 210s are in Series, the 215s are in Series, and the two are probably Parallel.

Would I be correct on this?

This is actually all I need to know for sure.

.

See attached (downloaded from the link I provided earlier). The 15s are wired in parallel with one woofer wired out of phase.

If you look at the schematic of the crossover module, you should be able to reason out that the 15s are connected to J5 and the 10s are connected to J6 pins 1 and 2.

When you plug into the biamp input, it breaks both the signal and ground side of the circuit, so the 15s are totally isolated from both the signal and ground side of the HPF circuit.

 

[Wasnex]

Inductors are sometimes called coils, and capacitors are sometimes called chokes. In this application, those components are what are used to allow certain frequencies to pass, and allow others to be blocked. It’s how crossovers are designed. It can be as simple as one cap or one coil, all the way to a board chock-full of components.

In simple terms, if you want to lo-pass a woofer, IOW, send only frequencies below a certain Hz thereby blocking everything above, a coil would do.

If you wanted to hi-pass a tweeter, IOW send only frequencies above a certain Hz thereby blocking everything below, a cap is used.

FYI Chokes are inductors AFAIK.

 

[Coolhandjjl]

FYI Chokes are inductors AFAIK.

My bad

 

[Nicholas Orick]

See attached (downloaded from the link I provided earlier). The 15s are wired in parallel with one woofer wired out of phase.

If you look at the schematic of the crossover module, you should be able to reason out that the 15s are connected to J5 and the 10s are connected to J6 pins 1 and 2.

When you plug into the biamp input, it breaks both the signal and ground side of the circuit, so the 15s are totally isolated from both the signal and ground side of the HPF circuit.

Yes I already know this.

I am NOT an EE guy but I do know a little something.

What next?

 

[Nicholas Orick]

It's obvious the OP has a problem where the Isovent is not in alignment with heartbeat of our planet.
432Hz tuning is the answer. It will no longer be an F...Bomb.

Um Er - OP here,

What are you talking about?

.

 

[Wasnex]

Yes I already know this.

I am NOT an EE guy but I do know a little something.

What next?

You hook up the 10s and 15s without the crossover module and tell us the results.

 

[Nicholas Orick]

FYI Chokes are inductors AFAIK.

Okay sounds good, but what could ne Building Up an Intense F?

Something tells me that between Choking and Blocking is a Build Up of F Frequencies causing the F Bomb to Overload.

 

[Nicholas Orick]

You hook up the 10s and 15s without the crossover module and tell us the results.

Okay.

Need to get some Quarter Inch Jacks before doing this. Will take a couple of days.

 

[crazyBassClown]

What are you talking about?

Because your speakers are too fast, try slowing them down to 432Hz.

Or not.

 

[Coolhandjjl]

Or just use a HPF pedal, dial it to 80, and poof! No more F bomb.

 

[Nicholas Orick]

It's an old-fashioned way of protecting drivers. The bulb is basically a resistor that increases its resistance as you slam it with more power. It's calibrated to the power that speaker system can handle. As you begin to overload the cab, the lightbulb begins to light up. When it lights up, it begins to act like a gigantic resistor in real time to the current being delivered - effectively preventing it from getting to and damaging the speaker.

There are much better ways of doing this now, but as a last resort, it can be a helpful way to protect the speakers.

I see an inductor and a couple of filter caps on the board to remove the bottom end from the side feeding the tweeter - everything else is just wiring up between the jacks and the tweeter control.

How can I improve this set up.

For example what would be a better way of protecting against the Slamming Overloading - besides using a light bulb?

How can I pass All Frequencies without building up the F Bomb?

 

[Nicholas Orick]

Or just use a HPF pedal, dial it to 80, and poof! No more F bomb.

Poof I also have No Bass below 80.

Very Funny.

I play five and six string bass going to Low B of 30.

Try again.

 

[Nicholas Orick]

Because your speakers are too fast, try slowing them down to 432Hz.

Or not.

Um er - do you play Bass or Guitar?

You sound like a Guitar player who is In Over Your Head on this Bass site.

.

 

[Nicholas Orick]

To add further to why the lightbulb, because tweeters can handle much less power than woofers and often get blown, so the lightbulb is used to protect it. If the circuit diagram is accurate then the tweeter is the only thing it is protecting. This is highly likely.

Okay since I took the stupid tweeter out of the diagram then I no longer need the light bulb.

Outstanding.

Now we are starting to get somewhere with the problem.

 

[crazyBassClown]

You sound like a Guitar player who is In Over Your Head on this Bass site.

Funnily enough I was having a similar thought about someone being in over their head.
But what you gonna do...

 

[Jim Carr]

More than the fundamental may be missing here...

 

[Jim Carr]

Poof I also have No Bass below 80.

Very Funny.

I play five and six string bass going to Low B of 30.

Try again.

More than the fundamental may be missing here...