0:00 - 0:14
No.
0:15 - 0:20
Yap, now they are.
Just kidding (almost). Never, ever let voice coil to hit the plate (crackling clicks from 0:15 - 0:20)!
You have some problem with the amplifier. Flapping woofer cones without actual sound indicate inaudible very low frequency garbage coming from the amplifier.
No.
0:15 - 0:20
Yap, now they are.
Just kidding (almost). Never, ever let voice coil to hit the plate (crackling clicks from 0:15 - 0:20)!
You have some problem with the amplifier. Flapping woofer cones without actual sound indicate inaudible very low frequency garbage coming from the amplifier.
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After "Frapping" them in free air like that, yep, they probably are.
NEVER run a woofer up to full power outside it's enclosure.
NEVER run a woofer up to full power outside it's enclosure.
Ummm ... no ... in free air a woofer generates as much sound off the back as it does from the front but they are out of phase and the two cancel each other. It's working hard, but you hear nothing. That's why we mount them in baffles... to keep the two outputs separate so we can hear one of them.
No. In free air there will be at least some midrange sound from woofers, in spite of eventual out-of-phase connection.
They did exactly what I expected them to do. Don't keep doing that or it can smash the coil former and it won't run smoothly in the gap.
The baffle keeps the front and back waves from mixing and thus cancelling.
Even just cut some holes in cardboard boxes for testing...
Rattle
When I first bought it, the bass was sooo deep. Now, it rattles at anything over medium volumes. I took it apart thinking I would see something obvious, but the appear fine... still sound very rattley... should I replace the drivers? Similar model?
When I first bought it, the bass was sooo deep. Now, it rattles at anything over medium volumes. I took it apart thinking I would see something obvious, but the appear fine... still sound very rattley... should I replace the drivers? Similar model?
Were you generating the tones yourself or was the amp doing it on its own? What makes you think there's something wrong?
Is there something loose in the box, a brace has come unglued maybe, something in the room in sympathetic vibration, the box not sitting on a good surface?
Yes, I was using a drum machine.
Maybe nothing is. Maybe I am misremembering. It plays all sounds fine, except really low tones, when they are loud
Maybe nothing is. Maybe I am misremembering. It plays all sounds fine, except really low tones, when they are loud
Those driver looks great, i thought marshall used only junk drivers. I bought one of the earlier modells but returned it because of the very poor sound quality, yours may be better? I think the voice coil is damaged, maybe near the cone, so you need large strokes to detect it
Drum machine?! Well, that was a really mean misguiding. 😡
I thought you were playing ordinary music through it, with all music spectra.
So, yes, with such low frequencies from drum machine, woofers in free air will produce no sound.
Bottom line:
- amplifier is OK,
- woofers are OK, except with possible voice coil damage from hitting the backplate,
- you are a loudspeaker molester. 😀