And Now For Something REALLY BIG

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JRKO

JRKO

Member
Joined 2003
ok Im still pot bound!!

As I understand:

terminal 1 = input
terminal 2 = output
terminal 3 = gnd

at the moment I have input & output wired but gnd goes strainght from the phono to the gnd on the board = full volume no control.

Would the gnd wired from phono to terminal 3 then to gnd on the board sort this?

here is the spec of my pot

im confused.......please halp (because even with only one ear working this is annoying :D) There are so many different wiring 'options' espoused on the net...........

according to http://sound.westhost.com/pots.htm 3 is input, 2 is output and 1 is gnd AAARRRRGGGGHHHHHHH
 

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JRKO

JRKO

Member
Joined 2003
tnx buzz

I have 10k across 1 & 3 and I have 0~10k across 1 & 2 as well as 2 & 3 meaning.....

aww I dont know what it means. Its 3am, I'm half deaf, cant wire a damn pot and my cat just crapped under my desk.......damn cat

'Kicks cat out of bedroom, goes back sleep until at least 4am'
 
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JRKO

JRKO

Member
Joined 2003
okay, throwing cat out woke wife :mad: so I got banished too!!

All I can discern fro the above is that terminal 2 is output. I think........
O crap I dont know. How can build a NP KT and fail at sorting a pot of all things?

'sneaks back to bed as wife snoring' - no dear you don't snore (much) must be the cat.......
 
JRKO

JRKO

Member
Joined 2003
I'll be running 600/650 absolute lowest down a room 11' wide and prefer a wide sound spread as possible as possible. Sound stage is usually an illusion these days, mastered into a recording rather than carefully coaxed from the actual performance of years gone buy

chalk up 2 for multicells!!


Pano is a 'cell type guy (no I dont mean top bunk, keeps a pet cricket and steals your meds)

So thats 3 to the multicells!!!

And me makes

well 4 and I'm the dealer so house wins!!!
 
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JRKO

JRKO

Member
Joined 2003
Getting back to how Keith builds his multicells, earlier posts on the subject:

JRKO said:
"Because of the widening of the of the entrance it keeps all the 15 appertures the same area never thought about it before. they could be tapered if you prefer that would give the outside 6 cell slightly more area"

I guess he means widening at the external cells. I think its because his cells start from a flat plane rather than radiating out, as if from a central point.

What thinks you?
Click to expand...

JRKO said:
Just thinking on the above, doesn't that mean the outside are a different length to the rest?
Click to expand...

Pano said:
Good questions. I certainly don't know. :scratch:
Click to expand...

JRKO said:
Ok he's come back with a bit more info - "yes the cells are slightly shorter on the outside banks but the throats make up the differance by being longer on the outside edges"

Does anyone out there speak 'multicellular' fluently? Pano, how are the start of the throats arranged in your horns? Cal maybe you can shed some light?

I doesn't seem 'right' to me :confused:
Click to expand...

Pano said:
I believe the cells on my horns are all the same length, but could not swear to it. I'll measure them and show you a photo of how they join together as soon as I can.
Click to expand...

Cal Weldon said:
Pictures are best. You can see the arrangement at the throat. All horns are the same length and form a radial curve at both the throat and the mouth. The waveguide takes the round exit from the driver and makes it rectangle to enter the horn.
Click to expand...

Pano said:
We are hoping that you will buy a set and tell us! :D
Click to expand...

So his horns are different because he builds the small end to a flat surface not all horns the same length leading to a rounded sent of entrances - his way makes sense now. I dont know whether to ask for a change or not thou
 

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JRKO

JRKO

Member
Joined 2003
ok miniDSP has arrived. Sat useless in its box until I have something to use it for. Horns are on order and should be a week or 2 now.......

cant wait........

just need to sort preamp

Emkens will happily do 750hz and below until new 15's are ordered. 15FH500 http://www.faitalpro.com/products/LF_Loudspeakers/product_details/index.php?id=151060100 are looking good - esp as they are £50 cheaper, EACHthan the 510 ferrite version!! slightly higher Qes & Qts and lower BL but should be good in a 4cuft box tuned to 45hz gives a -3db fig of 47hz. Plenty low for me in my smaller room.

A bigger box is possible so any ideas welcome
 
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JRKO

JRKO

Member
Joined 2003
At the moment I cant get myself to concentrate and lose my temper for less than 10 min which is not conducive to paper making.

I will however be coming back as soon as I'm stable to this Idea. Person, made to measure paper horns turn me on.........;)

for noe £180 8 cells will have to do :rolleyes:

Maybe my paper set will be 15 or 18's!!!!!!
 
IG81

IG81

Member
Joined 2008
JRKO said:
Emkens will happily do 750hz and below until new 15's are ordered. 15FH500 FaitalPRO | LF Loudspeakers | 15FH500 are looking good - esp as they are £50 cheaper, EACHthan the 510 ferrite version!! slightly higher Qes & Qts and lower BL but should be good in a 4cuft box tuned to 45hz gives a -3db fig of 47hz. Plenty low for me in my smaller room.

A bigger box is possible so any ideas welcome
Click to expand...

With this driver (15FH500) in a small room, I'd go with a 4cuft to 5cuft (net Vb) box tuned to Fs. It will play lower than your 45Hz tuning and the sloped response will possibly be better adapted to your room response. At least that's how I tuned my TD15M's in my small room and I like it. This also keeps a certain ammount of room for high impedance drive such as SET amps, which should also benefit from the tuning at Fs for maximum power transfer.

IG
 
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