4343 crossover modifications

[B&KMan]

For now that is.

Hi, Giskard,

For a moment, I haved high level stress because I buy many bock of caps based on this remark and a couple other of great members...


You are lucky man...

I hope to go in good way me too...

p.s. I found a 3.3 Mohms 1/4 and 1/2 watts resistor for circuit battery...

what is best ???

thanks again.


Jean.

[4313B]

1/4 is fine

You are lucky man...

Why? Did I narrowly miss another beating or something?

[Ian Mackenzie]

Jean,

How is your crossover going.

I tested the original equivalent 3145 built auricap crossovers today and they perform to JBL attentuations specs. I was busy today but played them on a movie "Hunt for Red October" in DTS tonight. The Russian choir work comes across very well.

Ian

[B&KMan]

Jean, How is your crossover going.

Hey, I try to send info this week-end but this www is not aivailable

Well first is big jobs and I hope this build is fast but it too much time for quick build-up so I install and try to works as off time... but I have a familly with 2 young kids, and camping time and party kids, and, no time for follow project...

So I have one section (LF) completed (90%) and rest of one speakers is good implementation...

--------

Well many parameters is important as you know...

The network is put in 3 plates granit 12" X 12" so where you place this monster ???

what is a best build box for maximum inertia and less transfert vibration and try to better overall vibration speaker...


Well after many time reflexion I send pict of my box project...

This idea is simple but little difficult to realize...

1--- create mass inertia with less damping factor modal response.
2--- fixation network with improvement back speaker inertia.
3--- no adding box with adding resonnance speaker or other coloration....
4--- TRy not create a box radiator generator vibration....

so My idea is put back box with curve top panel... (see pict) This box contains network fixing epoxy elements...

1--- mass inertia...
2--- fix vibration caps and create fast leaking path...
3--- create mass inertia and fast path for speaker vibration.
4--- create diffusor back speaker for dissipation of back standing wave cerated on corner...
5--- protection box

What your feeling of this idea greats members ?

Jean...

[B&KMan]

Why? Did I narrowly miss another beating or something?

hey !! the nirvana is futile ???

I'm personally perfectly satisfied with ....

Jean...

[B&KMan]

I tested the original equivalent 3145 built auricap crossovers today and they perform to JBL attentuations specs. I was busy today but played them on a movie "Hunt for Red October" in DTS tonight. The Russian choir work comes across very well.

Ian

Do you have a pict ???

More taste report ???

mmmmmm I want more meat...

[Ian Mackenzie]

I do but would prefer to keep under wraps until its fully complete and then start a project thread.

Ian

[Ian Mackenzie]

More meat, a taste test..some vino . Yes.

Oky docy,

I play again tonight.

Lesson number 1. 4 way speaker easy to make phasing error.

Nothing more annoying easily fixed...but we have a surprise to eliminate such things in the project..

Actually I can't tell you what it sounds like because I can't hear it......yes the power was plugged in...Muhhahahahaha....a joke.

No really incredible....as a well known friend says like peanut butter and chocolate.......

There was no inkling to tweak, its was so relaxing but at the same time engaging where you really start to listen to the music and forget about the speakers and everything else....Call it being there.

Sez below is the crossover board and my assistant Otis. The board is yet to be installed in the external enclosure. At the moment its just hooked up for some tests. For those interested I would describe this as a difficult thing to make and requires patience and a lot of TLC. Details to be discussed in a future thread.

The interesting thing and reason for posting the 3rd image is all the faders are set at zero (0) db. I can't recall one instance on the forums where anyone plays their 43XX monitors with the faders set flat, particularly 4 way systems.

I have measured the response and its absolutely flat and sounds perfectly balanced. I attribute this to the crossover parts quality, careful setup and calibration of the L pads and of course a brilliant amplifier.

This will be discussed in the project thread to be published soon.


Ian

ref system;

JBL 4345
BOSOZ sys X Preamp
Passlabs Aleph 60 Power Amp

[rek50]

Ian, Nice component mounting method. If Otis is anything like our three "Meeeezers" (Siamese), He has trained you plenty. LOL.

[Ian Mackenzie]

Well lets just say he's very smart and rungs rings around some people.

Ian

[B&KMan]

Well lets just say he's very smart and rungs rings around some people.

Ian

Hey hey Cool picts and info... and I feeling this is jimmy smith the cat album inspiration ????




of course it is better classical presentation board... look better...

I'm surprise you put foam computer part under caps ???

nice finish on mdf....

I hope you not evaluate sound with horibily cheap crocodile clip cable ??

muaaaaaa

next soon...

I plug the LF section on I try to perform a couple test mesure in next days...

[Ian Mackenzie]

Looks are not everthing visible.

The panel is aluminium. The pads are medium density cell rubber with the primary purpose of providing a moulding for the capacitor to seat on without bruising.

The crock clips are only temporary..I find them particulary useful for inital testing before final assembly

It was not an acid test and only as narrow insight for a mad scientist to get his rocks off.

We will disclose the wider perspective on upgrading a 4343 to a 4344 soon enough. .

Ian

[B&KMan]

Lesson number 1. 4 way speaker easy to make phasing error.

Nothing more annoying easily fixed...but we have a surprise to eliminate such things in the project..

You talk really right !!! maestro

Hey I just finish a simple test work on LF section...

Test impulse reveal invert phase response in regard of the traditionnal 3141 Network !!!!!

with the 3141 network the cable black and green is for LF and black put to black and green (+) put to red
In this: the driver is go back if positif impulse s run....

Big surprise !!!
if I put same set-up with my new network the result is 180 invertion of phase.

after check multiple time the connections all is OK !!!

Anybody have a hypothesis of this phenomenon???


Thanks Jean.

[B&KMan]

Looks are not everthing visible.

The panel is aluminium.

Ian

AHHHHH... honor is save....

well, the rubber is interesting approach in particulary if you put alu. plate...

double aspect: (1) absord and dampind vibration and (2) save deformation caps by tensile stress due to tarap...



Ian, you expose your set-up audio but you not expose your instrumental set-up...

My curiousy is infame but I'm not resist of this question...

so please....

Jean


p.s. do you have not stressed to lead caps is internal short-circuit by unfortunatly contact with alu plate ???

[Ian Mackenzie]

Please post picture and diagram