speaker rattle

[y0ukn0ws1t]

ive just unpacked and tried out my new Ashdown abm c115 500 combo,sounds nice but has rattle at almost all volumes,appears to be coming from the speaker.do i need to bed it in and play for a while at high volumes or do i need to return it for a look?any advice would be much appreciado

[greenshag]

try to see if all the screws holding the grill are secure first.

[Kindness]

Forgive the blatantly obvious advice, but find out exactly what is rattling. Then we can give you helpful advice, like "tighten that screw."

[Craig Vecchione]

If it's metallic in nature, suspect loose hardware. If it sounds more 'dampened' it could be the speaker dustcap is unglued or similar problem with the speaker itself.

[y0ukn0ws1t]

i have taken off grill and checked speaker and screws fastening it all appear fine noise comes from behind the right edge of speaker,must be loose connections,back to the shop:facepalm:.so there is no "bedding in" period for a speaker?thanks for help,ta

[no-logic]

I've mistaken port flutter for a bad speaker before. Stand a couple feet away and see if you hear it. If you listen too close the port flutter will fool ya.

[y0ukn0ws1t]

i hope you are right no_logic,i cant try it now as it is late so i'll try again tomorrow and let you know!ta

[y0ukn0ws1t]

thanks for help,took out driver to find the culprit,a small panel pin resting on the spider held in place by the magnet.glad i dont have to return it,as it sounds real nice.cheers again ombres

[g.ghost]

So much for their quality control. I guess the factory didn't plug a bass into it and actually try it before it left the factory.

 

Great that you had the nerve to actually unscrew the speaker and see what was going on inside. Imagine if the screw driver would have slipped and put a hole in the......no it's too painful to even think about..

[Billystrat]

So much for their quality control. I guess the factory didn't plug a bass into it and actually try it before it left the factory. Great that you had the nerve to actually unscrew the speaker and see what was going on inside. Imagine if the screw driver would have slipped and put a hole in the......no it's too painful to even think about..

 

I've done this. From now on the speaker cabinet must always be laid flat before hand. The speaker was already blown and I was replacing it, so it was a good and painless lesson to learn

[freeridstylee]

 

I've mistaken port flutter for a bad speaker before. Stand a couple feet away and see if you hear it. If you listen too close the port flutter will fool ya.

 

 

What does port flutter sound like? Is there anyway to reduce it?

[Craig Vecchione]

 

What does port flutter sound like? Is there anyway to reduce it?

 

 

Sounds just as the word implies...a fluttering sound at certain frequencies. Better cabinet and port design can usually minimize or prevent it. A too-small port opening/diameter can sometimes be the culprit...when the air velocity is high, there's a better chance the air movement is great enough to be audible.

[freeridstylee]

Is it a higher pitched/kind of crackly sound? I'm having trouble with my cabs and am kind of new at this.

[y0ukn0ws1t]

new cabs?i think port flutter is more of a whooshy air noise,crackling is usually associated with component wear i.e pots or the woofer driving frequencies which are too high,does it happen all the time?

 

as for ashdowns quality control,they probably tried it out with no pin noise,but then in transit/unpacking the pin could have found a new noisy home.not trying an amp before selling it is bad economy

[Craig Vecchione]

 

Is it a higher pitched/kind of crackly sound? I'm having trouble with my cabs and am kind of new at this.

 

 

No, it's more of a "flutter", hence the term "port flutter".

 

 

 

Why does this discource remind me of some sort of Monty Python sketch?

[Guttermouth]

 

Why does this discource remind me of some sort of Monty Python sketch?

 

 

http://acapella.harmony-central.com/forums/showthread.php?t=2101450&highlight=official+argument+thread

[bnyswonger]

No, it's more of a "flutter", hence the term "port flutter".

 

Gee Craig, your powerful descriptive ability has got my port all a-flutter.

[yyz1963]

When I play an a-flat, b, or b-sharp on my 4th string (low e) I get a terrible crackle/buzz out of my speakers. It is not fret buzz. I can play any note higher and lower on the bass, even the same note on the 3rd string and not have any problem. Has anyone ever been through this before? I checked the speaker wiring = ok, I played the amp head through another cab = ok. The only thing I haven't tried yet (I will tonight) is playing a different bass through this setup.

 

Current gear = MIM Fender Jazz, original pickups

Peavey Mark VIII XP 350w @ 4ohms

Ampeg SVT410HE Cab with Peavey 10" Pro Drivers (400w)

8 ohms

 

 

Any Ideas?

[bnyswonger]

That part about the same note on a different string caught my attention. I'm gonna bet the heavier gauge string does it, right?

[yyz1963]

that's right

[bnyswonger]

 

that's right

 

 

Then it's an amplitude thing. If it's got a tube in it, tap it with a pencil while the amp is on to see if it's microphonic.

 

Also check your speaker connections - I thought I had blown 12" last year because it was doing something like that and it turned out to be only a bad solder joint on a speaker - some notes would exacerbate it.

[yyz1963]

THANKS

[yyz1963]

Thanks all for your help on this, after further investigation it was the AMP's equalizer:mad:, specifically the 90k range. I took the amp back for full refund, thanks Trade-up Music in Portland.

 

Later