Adding ports for ventilation.

[Nephilymbass]

So I have an ampeg 410he I want to drill a big hole or two into. The deal is I had the speakers replaced. And have been messing with it. The new speakers are pushing more air. It's like an air compressor shooting air out of the rear jacks. I pulled the horn out and tried it and it seemed to let the air move out but I also want to use the horn, any advice on how many or where I should drill the hole?

 

[GreyBeard]

you're kidding, right?

 

[B-string]

You are joking right?

 

[Nephilymbass]

you're kidding, right?

Nope. The issue right now is the air has no where to go. They are speakers designed for sealed and ported cabs.

 

[B-string]

The "holes" are not for ventilation they are for tuning the cab to the speaker's needs. You Don't need to "let the air out" and doing so would allow your speakers to lose control and slam the cones back and forth to failure.

Excuse me now,I have to drill some holes in my skull for ventilation in this heat

 

[samson3382]

Watch Thread

 

[Jeff Elkins]

I've only ever replaced one speaker in one combo (once), and it was a PIA to get the exact right speaker (can anyone say "G-K"?), so my experience is limited. But I think my comment may be helpful:

Any speakers you put into a cab should be matched for the cab volume. If you haven't done the research on this, you must.

I think, based on your OP, that you recognize that the cone excursion is different than the previous speakers, and you fear damage to the new ones. You should.

Porting the cabinet may be an answer--but it would be MY last resort, and not without looking up (and fully understanding) the proper math. It's way more complicated than your OP leads one to believe that you realize.

Finally-- a) it's possible your speakers are a fine match. In which case b) something else is causing the excursion. If you determine that a = true, then there are other solutions for b. Search here for "fdeck speaker excursion" for more inframation. (Sorry, infrasonic pun, there)

Either way, back up the cart and research your cab and speakers before anything else, including plugging in.

 

[S-Bigbottom]

It's like an air compressor shooting air out of the rear jacks.

Put a foam earplug in the jack, now it is a sealed cab.

 

[Nephilymbass]

I

The "holes" are not for ventilation they are for tuning the cab to the speaker's needs. You Don't need to "let the air out" and doing so would allow your speakers to lose control and slam the cones back and forth to failure.

Excuse me now,I have to drill some holes in my skull for ventilation in this heat [/QUOT

I understand about cab tuning and ports. I've had plenty of ported and sealed cabs. That's not what im try to accomplish. I can definetly see it being a side effect though.

Basically with the horn in the cab I'm worried about destroying the speakers at moderate levels. With the horn out the speakers are moving more naturally.

The speakers are supposedly designed for sealed and ported cabs. I swapped out the stock Chinese emenince 32ohm speakers for 8 ohm american made eminence speakers and had the cab rewired for 8 ohms. I guess I'll just wait and see how they hold up. Haven't had any issues so far but they've only been in for a week and onstage with guitars and vocals in the monitors I tend to turn up a bit louder than at practice. We have a show tomorrow night so I'll see how it goes.

 

[CL400Peavey]

I understand about cab tuning and ports. I've had plenty of ported and sealed cabs. That's not what im try to accomplish. I can definetly see it being a side effect though.

Basically with the horn in the cab I'm worried about destroying the speakers at moderate levels. With the horn out the speakers are moving more naturally.

The speakers are supposedly designed for sealed and ported cabs. I swapped out the stock Chinese emenince 32ohm speakers for 8 ohm american made eminence speakers and had the cab rewired for 8 ohms. I guess I'll just wait and see how they hold up. Haven't had any issues so far but they've only been in for a week and onstage with guitars and vocals in the monitors I tend to turn up a bit louder than at practice. We have a show tomorrow night so I'll see how it goes.

You dont get ports with out dealing with the tuning of the cab. They are one in the same.

 

[agedhorse]

I'll have to admit the logic is interesting if nothing else...

 

[BassmanPaul]

Try Beano. Great when there is too much wind!!

 

[B-string]

The next deflate-gate, gotta let the air out.

 

[BassmanPaul]

OP Your cabinet is a sealed box. The air is supposed to stay inside. It supports and controls the cones and protects them from over excursion. If you do as you suggest you will blow your speakers. The fact that air is blowing out of your phone sockets just means that the input panel was not properly sealed.

 

[Josh Thatguy]

Just remove one of the drivers and run it as a well-ventilated 310.
That's about as logical as drilling holes in an Ampeg. Screw the impedance and such. Hell, use car subwoofers like some geniuses do.

Perhaps the proper 32-ohm direct-replacement drivers would have been the better option?

 

[ole Jason]

Does the letting the air out of a cab make it easier to carry?

 

[friendlybass]

Load up your speakers and box in a speaker design program to "try" your porting plan in a consequence free environment. You may (to achieve optimum performance) need to build/have built a cab for the speakers. Hope it all goes well

 

[David Jayne]

Leave. It. Alone.
Sealed cabs are simple. Proper ported cabs are much more complicated and you won't get good results trying to hack your box. Leave it.

 

[ChrisCassisi]

I ported a shallow,sealed 4x12 loaded with Carvins PS12s a few years back. I have had no issues what so ever and have pushed my cab pretty hard with some pretty low tunning.

 

[B-string]