Re: Amp/Speaker problem


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Posted by Toby Meyer on November 12, 2001 at 10:45:18:

In Reply to: Amp/Speaker problem posted by Zach on November 11, 2001 at 19:32:18:

Are all speakers distorting or is it just one?
If it's only one speaker, try to touch it with your finger (a slight pressure in different positions).
If the distorting sound is changing when you touch the speaker, the speaker is damaged: -> Image When the red wire inside the speaker is too long, it touches the membrane when it is moving and this causes this distorted sound.

I had the same problem with my 410 cab and I had to replace the speaker.

Toby Meyer


: Hi all,

: I'm currently using an SWR SM-500 powering an SWR Goliath III 4x10 speaker. Well, for a while now, I've been getting some strange noises coming out of my speaker. You'd think that a 700-watt speaker would be able to handle a 500-watt amplifier, but it's almost like the speaker is struggling. Either that, or my amplifier is putting out some really nasty signals.

: I first started noticing this problem about a month ago. I hadn't used my rig in a while, but I finally dragged it out for a big gig that we were doing for the Homecoming festivities at my college. I have the attinuator on the back of my speaker at about 2 o'clock, just for a little extra high end for slap. This causes the horn to hiss a little, but it's not noticeable when playing. I also keep the bass control on my amp at about 2 o'clock and the bass control on my instrument almost all the way up, with neutral midrange and a little bit of treble. Despite having two active basses, I use the Passive/Active input on my amplifier.

: That's not the problem though. The problem is in the woofers on my speaker. Every time I would hit notes on the low B or E string, the 4 10-inch speakers would pound and beat to the point of distortion on the lower registers. The sound would resemble a loud farting with low pitch. I figured it was a problem with the gain, but the gain was only set on 2. I turned it down anyway, and to compensate, turned up the master volume, which I had set on 8, with the limiter at 2. The woofers continued to distort, so I turned down the master volume on my amp and compensated by turning my bass up. Despite my every effort, I could not get this problem to go away. In fact, because of this constant distorting, I managed to tear a small hole in my lower right 10" woofer. The whole isn't big enough to cause a problem (yet), but still, it's rather disturbing.

: Also, I was using the D.I. output on the back of my SM-500 amp to the main bored. During soundcheck, the soundman was complaining that my signal was making a crackling noise. I went out onto the floor to check it out for myself, and sure enough, every time I would attack a string at a medium or high volume, a sharp cracking in the system would occur.

: Along with these two problems, I'm just not getting a whole lot of anything out of this amp anymore. The bass is muddy thanks to the distortion coming from my speaker, and I can hardly get any high end, especially from slapping, despite turning up the attinuator and keeping the treble on my bass pretty high. My sound is really weak and lacking; and it's disappointing because I have two high-end basses, Keith Roscoe 5-string and 6-string fretless, both of which have Bartolini 18-volt preamps, and the sound coming out of my rig doesn't do them justice. I check the batteries in my basses all the time too, and I keep them fully charged, so that wouldn't be part of problem.

: So what's the problem??? Where is the problem??? How do I solve it? How do I remedy it? Is it in the speaker? Is it in the amp? What should I turn down? What should I turn up? Do I need a compressor? Do I need a more powerful amplifier? Is my amplifier too powerful? Do I need another speaker to take some of the power-pounding?

: ANY help is greatly appreciated. I don't have a lot of time and money, so if there is any way I can save a little of both, that would be rad.

: Thanks,
: Zach




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