Three way crossover question

[AllenB]

Sorry, I misread this and thought the 5u6 was in series. I must be trying to keep on top of more crossovers than I can handle

 

[giralfino]

I used a 0.68ohm resistor for R1 in the tweeter filter and it blocked almost everything going to the tweeter. With my ear next to the tweeter I could barely hear the cymbals on jazz CDs.

Check the connections in the crossover. There is a bad contact, a connection with a high resistance (several ohms).

Ralf

 

[henrylrjr]

Check the connections in the crossover. There is a bad contact, a connection with a high resistance (several ohms).

Ralf

Thanks Ralf. I screwed up by trying to make connections as short as possible and a few wires were touching bare spots of other wires. The 0.68ohm R1, connected correctly, in fact improved the sound of the tweeters.

 

[henrylrjr]

And the 5.6uF cap is back in the XO and the speakers sound better than ever.

 

[henrylrjr]

My tweaks include replacing tweeter caps with Obbligato Premiun+ caps, adding a Jantzen 5.6uF Superior Z-cap to the mid range filter and replacing the two iron core inductors with air core inductors. And I will consider adding an R2 to the mid range filter. And R1 is 0.56ohms.
View attachment 1013084

 

[henrylrjr]

My tweaks include replacing tweeter caps with Obbligato Premiun+ caps, adding a Jantzen 5.6uF Superior Z-cap to the mid range filter and replacing the two iron core inductors with air core inductors. And I will consider adding an R2 to the mid range filter. And R1 is 0.56ohms.
View attachment 1013084

This diagram has been corrected to match the original P6 XO by showing L2 and L3 in series to the woofer.

My tweaks include replacing tweeter caps with Obbligato Premiun+ caps, adding a Jantzen 5.6uF Superior Z-cap to the mid range filter and replacing the two iron core inductors with air core inductors. And I will consider adding an R2 to the mid range filter. And R1 is 0.56ohms.
View attachment 1013084

The following diagram has been corrected to match the original P6 XO by showing L2 and L3 in series going to the woofer.

 

[henrylrjr]

This diagram has been corrected to match the original P6 XO by showing L2 and L3 in series to the woofer.

The following diagram has been corrected to match the original P6 XO by showing L2 and L3 in series going to the woofer. View attachment 1015947

Typo correction. Should have been L1 and L2.

 

[johnmath]

Well done, it seems like you have achieved your objective.

 

[henrylrjr]

So I'm a classicaly trained flute player and have been playing in jazz clubs for about fifty years and am considered to have good ears. While I like the sound improvements from my XO, the tweeter needs a bit more volume to get it to better match the mid range output. Would it make sense to replace the 0.68ohm tweeter resistor with a 0.5 ohm resistor? And here are pics of the finished XOs.

 

[AllenB]

You should get yourself some crocodile leads.

 

[johnmath]

The resistor takes drops the tweeter level less than 1dB, possibly only ~0.5dB, a quite small amount. Try the balance with the 0.56Ω removed (i.e. short-circuited out).

 

[henrylrjr]

R1 is presently 0.68ohm

The resistor takes drops the tweeter level less than 1dB, possibly only ~0.5dB, a quite small amount. Try the balance with the 0.56Ω removed (i.e. short-circuited out).

Not sure I understand what you are suggesting but I tried the tweeter filter without R1 and I liked the sound better with 0.68ohm R1. Now I'm looking to make very subtle changes in the tweeter responce so I thought trying a 0.25 or some other lower ohm value resistor might an make an audible. Does that make sense?

 

[AllenB]

It makes perfect sense. Either it will work or it wont. If not then you need to find the other thing which is causing the problem.

 

[henrylrjr]

I'm very pleased with the balance between the woofer and midrange so don't want to mess with thoses filters. This experimentation is fun and a great diversion from other troubling issues.

 

[henrylrjr]

It makes perfect sense. Either it will work or it wont. If not then you need to find the other thing which is causing the problem.

It is not really a problem. Just my critical sense of something that can be improved. Over thirty years I have bought seven custom hand made flutes. In 2007 I finally found my soul mate flute which was made in 1885. Perfection is in the details.

 

[AllenB]

Just my critical sense of something that can be improved.

That is where this all begins

 

[henrylrjr]

So the sound is pretty good but the upper end of the mid rage is a little bright/accenutated. Can I fix that with a resistor in the mid rande filter?

 

[AllenB]

The first guess would be to increase the midrange inductor.. but keep in mind that if you manage to create a discontinuity at the crossover then it may stand out. Therefore this kind of problem could instead be due to the lower treble being too high.

 

[henrylrjr]

So is there no easy way to attenuate a bit of the brightness of the upper mid range? Maybe replace the 5.6uF cap with with a diferent value cap?

 

[AllenB]

Using an equaliser may seem even easier, however you still want to match the problem bands to get the right results. Also, if the crossover isn't OK to begin with then the equaliser may only partly help.