Scan-Speek 4" for 49 cents?

[jbruner]

Re: Scan-Speek 4" for 49 cents?

Cut off the dust cap. Who needs a dust cap?

OK


Once again, sensitivity is unchanged because the dustcap weighs next to nothing. The good effects are above 15k, the cavity resonance is very bad.
It doesn't affect the cone break-up at all.

Blue is original, green modified.

So we need to fill the gap. I will replace the dust cap with a dusty cap.



Still only helps the last 1/2 octave.

[PWR RYD]

Re: Scan-Speek 4" for 49 cents?

Cool experiment. I have some $5 buyouts I've thought of experimenting with coating the paper cones.

[fatmarley]

Re: Scan-Speek 4" for 49 cents?

I'd be interested in this as well but I think wood glue or epoxy would be easier to work with to get it thicker.

But don't you need something flexible to help damp the cone? I think something like contact adhesive, puncture repair glue or a thin bead of silicone would be best.

[Tin_Ears]

Re: Scan-Speek 4" for 49 cents?

What would happen if you just did beads of thick super glue and not cut the paper?

I'd be interested in this as well but I think wood glue or epoxy would be easier to work with to get it thicker. It would also be interesting to see what a uniform coating of wood glue over the entire surface (sans the surround) would do.

[jbruner]

Re: Scan-Speek 4" for 49 cents?

Very interesting.
How did you manage to keep cone mass the same after the surgery, maintaining the same sensitivity?

The glue adds an almost insignificant amount of mass. On sample 2 the Fs went from 114 to 112.

Is it possible to make an audio recording demo like here:
http://www.harbeth.co.uk/usergroup/s...ther-materials

I am on slow dial-up. It's difficult just to load a picture.

[Adam_G]

Re: Scan-Speek 4" for 49 cents?

I agree on the 'try the glue without cutting it' crowd. Maybe it's just the glue damping that has the largest effect, rather than the cutting and damping. It would be cool to try it out!

[fatmarley]

Re: Scan-Speek 4" for 49 cents?

You are in luck. The NS6 is next on the execution list.

Cool! Would be great if you could get rid of that peak centered around 4k.


I honestly think you should try removing the dust cap on the cheaper driver to see what it does. I'd be very interested to see if it makes any further improvements - From what I've read there's a good chance it will.

[Sidi]

Re: Scan-Speek 4" for 49 cents?

You are in luck. The NS6 is next on the execution list.

blasphemy

[jbruner]

Re: Scan-Speek 4" for 49 cents?

Seconded. Curious also if your experiment resulted in overlapping of the cut seams as well, or if the seam is just but t together.

There is no overlap. It is a simple knife cut widened to a discernable gap by dragging the knife backwards. The glue is DAP Alex Plus clear caulk.

[jbruner]

Re: Scan-Speek 4" for 49 cents?

Very interesting.

I'd love to see the same done on a Aurasound NS6-255-8a. I only have four, so wouldn't want to risk it myself.

You are in luck. The NS6 is next on the execution list.

[jbruner]

Re: Scan-Speek 4" for 49 cents?

What would happen if you just did beads of thick super glue and not cut the paper?

I can do that if you want, but the glue I used is flexible, not superglue. I don't think superglue would have much damping effect. Do you want me to try just beads of flexible glue?

[knowledgebass]

Re: Scan-Speek 4" for 49 cents?

What would happen if you just did beads of thick super glue and not cut the paper?

Seconded. Curious also if your experiment resulted in overlapping of the cut seams as well, or if the seam is just but t together.

[Melby Audio]

Re: Scan-Speek 4" for 49 cents?

Very cool experiment. You may need to devise some sort guide jig before cutting up nicer drivers.

[fatmarley]

Re: Scan-Speek 4" for 49 cents?

Cut off the dust cap. Who needs a dust cap?

Joe Akroyd used to do that with his designs (Link)

[J Fallows]

Re: Scan-Speek 4" for 49 cents?

Cut off the dust cap. Who needs a dust cap?