Remaking Mission 760 (crossover Q)

[FE3T]

I have a pair of Mission 760 (old singlewiring version)
They have seen their best days, but the drivers are still good as new. (5 1/4" midwoofer, probably made by Peerless India. Vifa D19-TD 3/4" poly tweeter)

So i want too make new cabinets and eventually improve what can be improved.

The cabinet are easy too improve. a laminate of 16mm MDF and 14mm Birch takes care of making a solid box. wich also should improve looks. a sligthly deeper box with the same volume would also allow a longer,wider and less noisy port

But what about the x over in the 760`s
Have anyone figured out the way the components are hooked up and wich value the different inductors, caps and resistors have?

My x overs are so littered with melt glue that its close too impossible too get any info out of them.

I guess i could succed with just designing a regular 12db/oct Butterworth filter with 5 khz as a x over point and attenuate the tweeter 3 db with an Lpad.

What do you suggest? should i try too duplicate the stock filters with higher quality components (IF i can find out the needed info) or should i design new filter from the bottom

[David Gatti]

I would measure the response of the filters and then duplicate them (with better quality parts), but that's assuming you have the req'd crossover design software and skills.

[q1]

Oke. I intend to the same: to improve my 760i filter.

I have replace the cap in serie to the tweeter by a audyn cap 4,7mf and the audyn 15mf cap (in the woofer correction).

Had these part here doing nothing. So why not use them?
I sounds a lot better!!clown:

I would prefer mundorf for the tweeter, maybe i will but these later.

The Resistor in serie to the tweeter is 3.9 ohm 7 watt
The Resistor in the correction of the woofer is 1,8 ohm 7 watt

I like to know the value of coil in serie to the woofer. It is a ferriet type. An air coil might improve sound. Anyone?

Regards,

Rene

[Oil]

Just for reference, here is a photo of the crossover in my 760i's before modification as I am making a 'boombox' from them here: http://www.diyaudio.com/forums/full-...rt-design.html

[FE3T]

Seems like the 760i has a different woofer than the 760, my woofers have smaller magnets and i have also a different x-over/terminal

[Oil]

Here's a photo of the modified cross overs. The information about the boom box this went into is here.

small boombox speaker selection and port design

I've attached the gerbers for anybody who wants to produce this PCB.