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Really no insulation in my big 3620!

#22
billfitzmaurice said:
Line everything. The ports on the 18s are about 1/4 the area they should be to prevent chuffing. All in all a very poorly engineered cab.
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Yup. I had a pair of the original 1810s. They were pretty amazing...for the time. Unfortunately, the partition for the 18 was too small...resulting in less than optimal bottom for the driver. The 1820 was an attempted fix for this-larger volume for the 18 inch driver.

Kim
 
#24
eots said:
Perhaps Peavey was trying to keep the weight of their cabs down by taking out the insulation.:rolleyes:
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You mean I just made it heavier! It weighed 148 lbs before I wonder what it is now... ;)

Before I can give any real input as to 'chuffing' from this cab, I am going to have to play through it in a field, everything for about a block away vibrates like crazy!
 
#25
What would be the best way to obscure the sticks-out-like-a-sore-thumb foam which now glares from my ports? Before behind the grill was nice and uniform looking, now they just stick out badly...

3364708260_514f1d70ca.png
 
#28
fishsticks said:
Hey bill,
would adding additional ports or increasing the size of the existing ports help prevent the dreaded chuffing?
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They could be made large enough and then ducted to tune the cab. Without the ducts larger ports would upset the tuning, the low end would disappear and the cab would be very boomy.
Of course, this assumes that the existing ports were properly tuned in the first place, and judging by how badly Peavey botched everything else that's probably giving them too much credit. :D
 
#30
Also make sure the foam is not very close to the ports. You could actually strip it away to the back without any problem, leaving a strip of bare black wood a couple inches taller than the port height.

Re: chuffing... Seems at the minimum that you could cut similar ports on the other side and then calc the depth you have to add to maintain tuning.
 
#31
ok, so if i wanted to know how deep to make the tubes and what size to make the other port i would measure the internal dimensions of the box and plug the volume into win isd with the info on the bw 18's and then tune it to what frequency?

hrgiger,
does your cab chuff? i cant say that i have noticed it on mine... there is always to much wall and window rattle to hear the wind blowing ;)
 
#33
Does the insulation help to "cover up problems" with cabinet design---i.e. I use combo 300's both of which the original Black Window is long departed...if I insulate the cabinets, will it significantly "improve" the sound--in what way?
 
#34
patman01 said:
Does the insulation help to "cover up problems" with cabinet design---i.e. I use combo 300's both of which the original Black Window is long departed...if I insulate the cabinets, will it significantly "improve" the sound--in what way?
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Insulation is a necessity to absorb internal midbass and midrange reflections. If it's not there the response of the cab will be very poor, with numerous response dips and peaks.
 
#38
fishsticks said:
`
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Have you checked to see if your Tower of Power cabs are lined with anything? You might want to line them (you know with some kind of thermo-nuclear lining for when you crank them up).

Personally I think two 3620 cabs is overkill...but that's partly why I love it!!! In this time of micro heads and little 110's being heralded as handling outdoor rock concert gigs, I love seeing rigs like yours. So completely over the top Rock and Roll. :D
 

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