Cornwall Networks

[consistent]

Hi All

There have been a few networks for Cornwalls over the years which all use autoformers and a cap of varying values. What does the cap do in these circuits and why vary it by a few uFs?

 

thanks

[pzannucci]

Look up capacitve reactance.

 

In short, in an A/C circuit, caps block low frequencies based on the impedance of the circuit and their value.   That blocking of the impedance is the crossover point.  As the capacitors resistance goes down as the frequency goes up, it lets more electricity through the circuit.  Autoformers will modify the impedance in the circuit and you either have different impedance or differing crossover points/curves in the circuit.

 

 

[DizRotus]

Put simply, capacitors block (filter) low frequencies, and chokes block (filter) high frequencies.  Auto transformers, or autoformers,  balance the relative outputs of the drivers. The fine tuning of that process is anything but simple.

[consistent]

thanks guys, so in part it is technical as well as subjective ( to the designers ears)

[pzannucci]

2 hours ago, consistent said:

thanks guys, so in part it is technical as well as subjective ( to the designers ears)

Correct.  Speaker design is a mix of art and science.

[consistent]

Gents I am trying to learn more about the use of caps and chokes on their own and in combination. I read a lot but it just confuses me more. For example I see caps used in line (series) to a woofer but then used across the + and - terminals (parallel). I have attached a simple example to gain an understanding of what these types a cap and choke do in these circuits to a signal put through to a wooferSimple Circuit.pdf and how the resistance is seen by the amp. Assume the woofer is 4 ohms with a sensitivity of 94db @ 2.83v and please forgive my artistic skill and 'numbness' to electronic circuitry!

 

thanks again

[consistent]

Thanks and yes I have been through this site numerous times, good value but still some things I just don't catch?