[hum4god]

Hi

i have a xover for a three way speaker and would like to use it partially active which means i would like to keep the crossover between the mid and tweet , and get rid of the xover between the bass and the mid.
i will tri am using a deqx and adding a sub.

i can rebuild the xover between the mid and tweet , perhaps use better parts , or , would it be possible to use the existing crossover and just disconnect the bass speaker cables from , connecting the active ?

so , what i am asking for is the schematics between the mid and tweet , if someone could help me with this ????
i will high pass the mid/tweet with the deqx also .


 
i am adding photos of the crossover below.

[peranders]

Couldn't you simply follow the copper tracks?

[hum4god]

believe me , if it would be easy for me to "read" the board i wouldn't ask .
i did some minor point to point xover work , but am not very experienced , so if its so easy , please help .
thanx

[andyr]

You need to help us to help you, h4g.

You have shown us pics of the PCB's component side & also the track side.

Tell us (with reference to the relevant pic) what the text at the top of the PCB says.  It appears to be defining tweeter/mid/bass connections but it's not 100% clear to me what each solder point is.

Start at the left and specify what each one is - ie. from the component side:
* Black is ...
* White is ...

* Black is ...
* Blue is ...

* Black is ...
* Green is ...

Regards,

Andy

[hum4god]

thanks Andy

sorry that that is not clear

from left to right on the component side :

black white is tweeter
black blue is mid
black green is bass (two drivers in parallel)

black red is input.

from the other side of the board  its the opposite :
from left to right :
input , bass , mid, tweet


thanks
malcolm

[BPoletti]

Wouldn't it be easier to run the full range signal into the crossover for the mids and tweeters, then run a second signal from the preamp into an active low pass filter for the woofer? 

[hum4god]

i actually use a deqx , so i would like to high pass w/ the deqx into the passive xover for the mid / high section and low pass into the bass from the deqx .

i still need a xover between the mid and high driver passive though and was wondering if that could be read off the circuit board that i provided photos of?

otherwise , your suggestion might work , as i understand,
 just disconnect the bass drivers from the passive xover, and run them active from the deqx, and leave the connection w/ the mid/high as it is connected now with the stock passive crossover?????

[turkey]

just disconnect the bass drivers from the passive xover, and run them active from the deqx, and leave the connection w/ the mid/high as it is connected now with the stock passive crossover?????

Most crossovers use parallel networks, so you could just drive the woofers right from another power amp.

So you'd have your active crossover with two outputs going to two amps. One amp would run directly into the woofers, and the other amp would run into the existing passive crossover and be divided by that for the mid and tweeter.

If I get time tonight, I'll see if I can figure out how your crossover is wired from the pictures, or maybe somebody else will have time to do that and see if it's parallel.

[turkey]

I just noticed that the crossover says Danley Sound Labs. Why don't you just contact Tom and ask him? He can give you the definitive answer, and I've exchanged e-mail with him in the past and he seems like a really nice guy.

[hum4god]

do you have tom's email address ?
if you could pm it to me , i will try to contact him directly.
i did not have any luck when i asked for the xover points through his webpage contact , but perhaps he is more open when contacted directly.

[Russtafarian]

www.erseaudio.com has a crossover calculator tool you can play with.  You can look at parts layout and values on your crossover, plug them into the calulator and try to back into the crossover frequency and slope.

Russ

[turkey]

do you have tom's email address ?
if you could pm it to me , i will try to contact him directly.
i did not have any luck when i asked for the xover points through his webpage contact , but perhaps he is more open when contacted directly.

I just used the address off the website. It was several years ago too, so I guess things could have changed over there.

So, they didn't tell you anything, even though you have a pair of their speakers? That's weird, I've always heard they had really good customer service. (I know someone who uses their products for sound reinforcement.)

[andyr]

thanks Andy

sorry that that is not clear

from left to right on the component side :

black white is tweeter
black blue is mid
black green is bass (two drivers in parallel)

black red is input.

from the other side of the board  its the opposite :
from left to right :
input , bass , mid, tweet


thanks
malcolm

Hi Malcolm,

Sorry, with the information you provided, I tried to sketch out the circuit but could not figure out the actually tracks on the PCB well enough to be able to do this.  (There's nothing like holding the actual PCBs in your hand!  )

So unless you can make an attempt, it would seem you will need to contacvt the supplier, as others have suggested.

BTW what you want to do should be perfectly feasible - remove the bass LP and mid HP filters from the PCB and use your DEQX for these filters instead.

Regards,

Andy

[hum4god]

i will try to contact Danley again to get the crossover information.

still , if someone can read it off the board , that would be much appreciated as i have no idea if i will get an answer from danley .

thanks for trying Andy .

[kyrill]

With a Deqx, which I own, I would never follow your approach
a filter between mid and tweet will compromise transparency and musicality  much more than the link between sub and tri-amped speaker
So I would use the Deqx for the filters between bass, mid and high but would give the bass driver a finite "end at the low side. Deqx can do,next to the filter, so determine a slope starting at a certain freq. for instance the bass driver starts to roll down at 24 db/oct at 80 Hz,so -24 dB at 40 Hz, -48 dB at 20 Hz ( maybe, i am half sure this is possible with triamping)

Then connect the sub. Most subs have a top end variable freq and slope. Use Room correction to flatten it out under 500Hz
I belief there is at Deqx.com  a pdf for a tri-amping plus sub

[face]

www.erseaudio.com has a crossover calculator tool you can play with.  You can look at parts layout and values on your crossover, plug them into the calulator and try to back into the crossover frequency and slope.

Russ

That is far from accurate.