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Adding ports for ventilation.

#21
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#22
Nephilymbass said:
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?
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It is a put on, you're pulling one one us, don't you? You know, sarcasm, irony and nerdy in jokes don't fare well on the internet/mail at all. Only IRL when faced to face with people that really KNOW each other inside out.
 
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#23
Nephilymbass said:
... They are speakers designed for sealed and ported cabs.
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?!? The speaker elements are for both sealed and ported cabs? Then there's absolutely no problem at all. I still don't get where any of the problem lies (if this aint a put on). Why don't you skip the cab altogether then? Just hang the speaker elements up in steel wire through the holes and let them hang in the air, with no suspension at all. Then there's air all around them! Can't get more air than that. The air has everywhere to go! Makes them easier to lug around too. ;) You may have to scrap them and change them out in a couple of minutes, but hey, you have a deep wallet it seems...
 
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#24
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.
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I think you really do NOT understand it, if you are serious about this thread. Given what I have seen you post earlier about SVT-401HE vs HLF, it seems that you really need to study this and learn more if you actually want to gain any knowledge in this area.
Some transducers have parameters that make them suitable for both sealed and bass reflex cabs, but the overwhelming majority are specifically designed for sealed or vented applications. In general, the more refined the driver, the more it will rely on an optimum enclosure design and execution to deliver its best.
This you have already seen an example of, when your new, higher spec drivers revealed internal leakage in your Ampeg cab.
 
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#27
Nice to see the TBers constructive support on this thread......Real classy responses so far

OP, there's a lot of math and science that go into drivers and cab designs. There's a lot of info on the web that you can check out that will probably make you think this was a bad idea.
 
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#28
You do realize that this is the amps equivalent of relic'ing a <name your favorite bass here> with a belt sander? Don't take it so seriously; you have no idea how restrained the comments have been so far, knowing the posters. :D

To The OP: the air you feel may just be the flex in the cab when played loud. 1/4" is a pinhole in the cab. Is it loud enough? Does it sound good to you? If so, leave it alone.
 
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#29
I understand about cab tuning and ports.
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I don't think you do. Any hole in the cab is a port, and if you don't make it the right size you'll mess up the tuning of the cab if it is ported, or turn a sealed cab into a mis-tuned ported cab. Did you use software like WinISD to model the replacement speakers in your cab before you bought them? If you didn't then you absolutely don't understand about cab tuning and ports.
 
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#31
Yeah I'm not gonna do it after all. I really cranked up at rehearsal and it sounds great with the band as is. I was more worried about the speakers getting damaged but they sound great and appear to be taking it well. The cab definetly sounds deeper with the new speakers. Deeper low end response but there is a bit of volume drop above the 12 feet on the g strong. I'm assuming this is because of a mid range dip in that particular area. The cab really came alive with more volume. It sounds deeper than the stock 410he and tighter than the hlf.
 
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#40
basscooker said:
Which Eminence speakers?
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Just the cheap $75 bp102 200w 8 ohms speakers. Played Wilmington last night. the lows sounded fantastic. Nice and thick but tight (not flubby) at the same time. Probably do to the new speakers slightly lower freq response combined with the sealed cab. Worked well for 95% of what I played. I just wish that slight volume drop when I played the few parts I did way up the neck wasn't there. It's not like a night and day volume drop but it was Noticable and I know it's not the bass because ive played the same bass with several cabs. But I guess for $75 speakers they are only going to have so much range without dips. While I was playing last night I was thinking if I was playing a 4 string tuned bead it would be perfect.
 

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