Greenhorn Curvy Chang Build

[chylld]

My little mock-up is/was usefull to decide on how to attack the build.

that's cute


looks like it's going well so far... quite a hectic glue-up! reminds me when i recently ran out of clamps for my needle glue-up... 35 degree heat and quickly drying PVA glue = not a lot of fun

 

[Dust]

Hi. Can someone tell me if I should double up on the damping for the back of cabinet. I have some really nice 12 mm 100% Swaledale wool felt for the job. I know Scottmoose recommends covering 3 sides but can't remember if he said more behind the driver.

Thanks.

 

[Scottmoose]

Not initially. You could always add some more later, but I doubt you'll need it.

 

[Dust]

Many thanks Scott.

 

[Dust]

For anyone who might be having problems finding real wool felt, I got mine from here. http://www.tradepriced.co.uk/enviro_felt_underlay.html

Scroll down to bottom of page.

 

[jrevillug]

Nice build there.

I want to build a pair of the mock-ups as PC speakers, just for laughs.

Thanks for that link, too.

 

[Dust]

Indeed! It's just those 1 inch full-rangers are so hard to solder!

 

[planet10]

Indeed! It's just those 1 inch full-rangers are so hard to solder!

The ones i have aren't hard to solder, just really hard to mount.

dave

 

[Dust]

HI. Well I've managed to get the brace and felt ready to glue in today. The brace was guite labour intensive as it took a lot of sanding to fit. The next one should be easier as I will cut it a bit smaller. Hope the holes are ok , I thought bigger would be good for air flow.

 

[Dust]

I was lucky enough to have two large pieces of ply left over so I put one in the outer cab and used the inner box as the template for the brace.

 

[Dust]

Starting to cut out.

 

[Dust]

Checking for size. It was tight, so out with the mouse.

 

[Dust]

Not bad now.

 

[Dust]

dry fit of brace with driver cut-out and felt. I have left a 30mm gap around the vents with the felt , is that ok? I didn't want to get to close. Next up are the binding posts. I will be using Cat5
but I'm unsure how many single runs I should use. Any suggestions?

Thanks.

 

[Ed LaFontaine]

Combining all the conductors (8) in one cat-5 results in a conductor equivalent to 14 ga. Use two cat-5 minimum.
Consider combining all the solids into one conductor and the stripes into the other.
For longer runs, I suggest a tri-braid of cat-5 and still segregate the solids from the stripes.

Only for purposes of braid illustration:

An externally hosted image should be here but it was not working when we last tested it.

 

[Dust]

Excellent. Thanks Ed.

 

[planet10]

Use two cat-5 minimum.

We use the minimum... one pair of strands (ie 24g, use the same colour for both speakers, the twist is not the same -- leaves you enuff from a single piece of CAT5 for 3 more pair of speakers)... any less and the electrons wouldn't find their way to the speaker. Solid is better than stranded.

dave

 

[Dust]

Thanks Dave, I was thinking of using one full cat5 (all 8 conductors) for each terminal. Why do you only use 2 strands?
It seems such a wimpy connection.

 

[Bob Brines]

The reason that a single pair of CAT5 wire works is that with a 90+dB/w/m full ranger, you are running at less than 1 watt average. The ohmic drop in the wire is probably less than the drop in the connectors. You are not trying to push 1000 watts through a sub.

Again I say you need to build a set of cables from 16ga zip cord to use as a standard. If you really are suffering from ohmic loss in the CAT5, you will hear a loss of bass. I bet you won't.

Bob

 

[Dust]

Thanks Bob. I have much to learn.