2. speakers
  3. 172832-168368

Crossover help?

Hi to all I'm hoping someone might be able to help.

I've tried to upgrade components within my crossover and now have no HF signal.

The tweeter checks out.

I've searched for bad joints , shorts etc but can find nothing obvious.

Today I've pulled the upgraded components from the Hf circuit but still have nothing.

Using a continuity test its all good up to the main cap and after back to the terminal.

I do get a bleep from both terminals so assume thats the parallel resistor.

I'm at a loss as to why its gone completely dead.

Anyone got ideas how to check the network front to back with only a basic multimeter?

 

Thanks in advance if someone has some ideas

Regards Ian

 

notdeadyet
notdeadyet OP
23 posts
 

Thanks imhififan thats exactly what I was hoping someone could come up with.

Just checked the network as you suggested.

HF input terms OL

HF output terms starts at 0 climbs to 3.1

HF - to HF - 0.00

Surely its not possible the 3.3 cap stops that particular tweeter from functioning?

The new tweeters have just arrived but I can play with them until later this evening

 

 

notdeadyet OP
23 posts
 

Thank you to everyone who contributed to this thread.

The strangest thing happened.

After checking the network as per imhififan's suggestion I had to go out, came back and plugged in the network.

Working!! wft?

Replaced the 2R7 still works, installed 56R still works.

Bolted everything back together installed fitted new tweeter and we have music.

First impressions admittedly with only 1 side done, the overall sound seems more open, there is definitely more HF on the upgraded side but with less glare. I thought the + upgrade reduced treble by using the 56ohm (about 1db?) and lowering the crossover from 3 to 2.5k

I've had to postpone the other side as when I was checking R values the 2R7 (which was installed) gave some odd readings then the lead fell out!

I'm now going to have to wait for a replacement before tackling the other channel.

Shame as my job tomorrow's has just cancelled due to covid.

Thanks again for your help.

Ian

fiesta75
1,378 posts
 

imhififan knows his stuff, I would check for possible shorts and clean all the flux off the boards so you can examine it closely, 91% works better than 70%. Maybe something like a frayed strand of wire or solder splatter creating an intermittent short.

More to discover