going active with troels jenzen illu

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O

oorva

Member
Joined 2007
hello all.

my name is Ronny.

i am interested in troels box design (well most of it), but i want different drivers.

the design Jenzen-Illuminator

drivers:

T - VIFA XT25TG30-04
M - SS 18W/8531G00
B - SS 26W/8861T00

so i want to go active.

i have my tube amp (jolida jd1000rc currently driving a pair of proac 2.5 clones), probably to drive the mid.

i also can get a 4 channel amp (from a friend).

i read somewhere that the SS 18W/8531 will do fine in a 7 liter sealed box.
so i might do that (or a bigger sealed box).
if i will make the mid cab smaller i might add height to the bass cab hence
a bit longer TL (i think the line now is 1/4 wave 40 HZ). will it result a slightly deeper bass?

now to some active crossovers options:

my budget is up to 500$.
mainly, was thinking about the miniDSP 4x10 Hd | miniDSP
will it do all that a passive xo does (L pad, notch filter, baffle step etc)?
will i be able to avoid a pre amp (my sources are a pc and a cary cd player)
i like the up to 8 order LR option.

maybe ashly 4001?

maybe a pc based xover?

your opinions will be valued.

THX
 
picowallspeaker

picowallspeaker

Member
Joined 2007
Nice project and nice drivers , the Illuminator design .
The cost of the coil also surpasses some nice drivers ,as also
the caps needed for Hp'ing the mid .
I guess you should do some research ( on the Net ) to see
which paths are often taken and how acoustic energy is distributed
in the audio spectrum .
The passive crossover does this easily , in accordance to driver's
construction and taking into account all the different issues occurring when more than a speaker is a sound source .

I guess that a 10/20 W amp would suit for the tweeter
:scratch: probably needing an extra cap between the amp and the tw

Since that the construction of the project seems modular , you can start
from the mid chamber and test it with your amplifier .

Or you can start with the big box ....
 
O

oorva

Member
Joined 2007
follow up question

lets say i stay passive and just replace the illu mid with 18W/8531G00
will the xover for the mid work with some value changes (if yes what do i need to tweak)?
 

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picowallspeaker

picowallspeaker

Member
Joined 2007
Ah ah , Oorva wanted to change the components ,
I didn't read that :eek:
Well
Going active is the best way to overcome the studies needed
to make a multi way speaker sound good .
Just make the driver work in its preferred band and you're done .

Then position the drivers in the room .

But going active has some issues too . It needs an electronic crossover
and more than a stereo amplifier , so some skills are needed too
to set the whole system perfectly .

A published project ( I hope ) has it all done : driver choice , cabinet
design and the CPU , the crossover .

I would love to see a SS 18W/8531G00 in my room , I don't even think it would need a woofer below it .

Ronny , if you're interested in TL designs , I think you are in the right place .
Low bass extension and SPL might be a plus if the cabinet is well done .

Looking at Troel's design , I really don't like the way the drivers are 'suffocated' in the first part of the line , but they might work :confused:

But , remember that the crossover circuit is the heart of any loudspeaker
system , designed specifically for it and nothing else .
 
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O

oorva

Member
Joined 2007
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