Sound (bass) coming from back of cabs

mykey- wrote: no way, should be equal

unless they are really old and called Wembly B lines

Oh, cutting smiley26

The 3" coil one I presume?

Goodmans chassis jobbies, really old
the 2 brothers in Dalston lane used to sell them, arguments I had with them about spiders giving in

was it Johnston's? something like that

Hi all
While I totaly agree that drivers should show the same amount of displacement forward/back Some do seem to be more affected by cab loading than others and for some reason do display this. Direct radiating ported units seem to suffer badly from this if they are not properly airtight (ports aside of course)? Is it easyer to suck or blow? :lol:
I also suspect that some of this can be caused by power amps that develop offsets when driven hard and I am guessing this is down to the power rails becoming uneven at maxed outputs.

Some of the megga bass at the rear syndrome could also be tied in with what the cab is sitting on. I have worked on lots of stage systems that resonate realy badly at the low end of the bass scale. Some laminated cavity floors do this as well. I bought a little plug in speaker system to use with my laptop, made by a company called Jawbone. It is designed to drive some of its bass into the surface it is sitting on. It works quite well for a tiny unit with only a couple of Watts behind it. Now thinking along the same lines I can imagine how mutch an 18" sub does the same.

I guess if you are standing behind a stack, the majority of any upper bass being radiated will not find its way to the rear of the cab/stack. So what you are hearing is not so much more low end but less upper bass. It would be interesting to take some frequency specific SPL mesurements to see if this was true.



Daz