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question about a head / cabinet


FUSHA

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I own an ASHDOWN 300 ABM head (325w) and run it into a 4x10 (600w). Recently, at loudish volumes and certain frequencies the notes start to fuzz (almost like a blown sound) I tried the using an e.q. pedal and reducing the frequencies where it is buzzing and it works to a certain extent - but it means i lose alot of the thick low end. Does this mean there is something wrong with the head? It never used to do this. Someone suggested perhaps the fact I used guitar cables to connect the head to cab might have affected the head (which I have now changed to speaker cables). Or is this a problem to do with the cabinet?
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using the right cables is essential.i would suggest Monster cable speaker cables to connect the head with the cab and George l's to plug your bass to the head.

make sure you are in any way overloading the amp..maybe the buzzing comes from that..

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My guess is you have a blown speaker. But...

 

You need to test each component at this point. Find someone with a good bass/amp/cabinet, and plug one of yours at a time into the 'good' system and then play/test. Isolation testing will be more informative for you than any of our opinions or guesses.

I used to think I was Libertarian. Until I saw their platform; now I know I'm no more Libertarian than I am RepubliCrat or neoCON or Liberal or Socialist.

 

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I'll try my best to find someone here with a good setup. The problem is - there are very few. I'll see what I can fine :) Thanks..

 

One more question - how can you actually blow a 600w speaker? I mean is it easy? I have never played my amp louder than halfway.... it just seems impossible to have blown it unless it was blown from the start? Or perhaps a loose connection.

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Get an mult meter (OHM meter) test each speaker one at a time and see how much resistance is aross the terminals it should be very close to whatever the speakers are rated for if not you got a problem. Also push slowly on each one if you warped it you will feel a rubbing; if you do it's cooked.

"I never would have seen it, if I didn't already believe it" Unknown

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Hm. It's possible one or more of the drivers are blown, and if so, you'll also get cruddy sound at somewhat lower volumes. (Also, it could be that one of the cones is off-center ...)

 

But my guess is that you're underpowering the speaker cab, and your amp is clipping when you crank it up. "Underpowering" your cab means that your amp doesn't have the headroom (runs out of power) to make the cabinet produce as much sound as you're trying to - and so it starts to put out garbage. Your cabinet is capable of handling more power and making more sound; it's the amp that's wussing out.

 

In slightly more technical terms (if you want the real skinny, I think the Rane website has a techy description of clipping). Without knowing the specs of your rig, I'm betting your 4x10 cab is 8 ohms, and I'm guessing that your Ashdown is actually rated 300W at 4 ohms, which means you're probably getting only something like 220W out of the amp when you're pushing your 8 ohm cab ... so when you crank the amp up, it "clips" - (i.e. the normally smooth signal waveform is chopped off at the top/bottom because the power amp can't increase the signal amplitude past a certain fixed point) - and the unnatural waveshape comes through as gritty, nasty sound.

 

Over the long haul, clipping also is destructive to the speaker drivers (particularly if you have a tweeter, which handles lower wattages, in that cabinet), as the square wave form has a much higher total power than a curved wave ...

 

If I can find the site, I'll post.

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OK, so I got my head / cabinets tested individually and they were all ok. However, the problem was still there. So finally I decided to do something I never tried (which I should have) and put the 4x10 and 1x18 (I have 2 cabinets) which were sitting on top of each other on the floor next to each other. Funny thing is that they both work fine (seperate and linked up) Seems like the fuzz all along was the speakers (or cones) somehow vibrating off each other when they were stacked together. What I dont understand is that when they were stacked together BUT only ONE of the cabinets were used (i.e. connected to the head) it still fuzzed. Am I just plain stupid or are you not supposed to stack two cabinets of certain sorts on top of each other? Could that have been a possible problem all along? (i.e. has anyone ever had the same problem of two cabinets having fuzz at loud volumes / certain frequencies because they were vibrating off each other and somehow affected the cones or output?

 

Anyone's comments or opinions would be greatly appreciated. Thanks again for everyone's help.

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sounds like the cabinets are vibrating against each other. cabinets vibrate quite a bit when in use -- it only takes one cabinet to make this sort of noise against another one.

 

try putting a towel or blanket between the two and crank it up. if you're still hearing a rattle, you may have something loose inside, but i'd almost bet the noise will go away with something to damp the vibrations between the two cabinets.

 

robb.

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Originally posted by Sweet Willie:

Originally posted by coyote:

Isolation testing will be more informative for you than any of our opinions or guesses.

I agree.
i agree too. because i can. :wave:
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