Active Crossovers

[DasguteOhr]

I have the horn and the 10 inch on the stock crossover. That crossover seems to have a capacitor and resistor to the 10 inch. Isn't that cutting the low frequency off?

Ist that your stock crossover, are my assumptions correct?
Are the drivers connected correctly?


A phase plug for 10" is difficult and has a greater influence than you think. I would search the internet for wooden buttons that close the central hole (dust cap)

P.S
Analyzing a crossover without having it in hand and drawing a circuit diagram is very difficult. It can be notchflter, zobel network and different edge steepness in this xover.

 

[DasguteOhr]

I don't understand???
Isn't there a difference between how low a frequency a driver can reach based upon its size and how its mounted, and the space it in. VS How much energy a amplifier is spending to send power to the driver at all frequency levels.. In other words, even though the driver can not produce sound below 120 hertz in a baffle, the amp might still be giving it as much power as it can to produce a 30 hertz tone. Essentially that ends up being heat and distortion.

Of course the amplifier also reproduces 30hz, but if the speaker has a sound pressure of -20db than at 120hz, that's no longer a load. If you want to free it from bass there are two options: active xover or reducing the size of the coupling capacitor in the tube amp

 

[Kingrex]

Its been a lot of work tryiing to adjust the crossover for it all.

 

[Kingrex]

Of course the amplifier also reproduces 30hz, but if the speaker has a sound pressure of -20db than at 120hz, that's no longer a load. If you want to free it from bass there are two options: active xover or reducing the size of the coupling capacitor in the tube amp

Or passive crossover after the amp.

 

[Holmz]

Or passive crossover after the amp.

^That^ may limit current, but it will not limit voltage.

 

[Kingrex]

A phase plug for 10" is difficult and has a greater influence than you think. I would search the internet for wooden buttons that close the central hole (dust cap)View attachment 163215

That is what he actually offered. A plug to keep the wave from rolling into the center hole. He said a bullet nose is more for high frequency.
I can hear a change with the horn out. Its hard to pin down how to describe the change. Lets just say its staying out.

 

[Kingrex]

I tried using the active crossover to level match the amp for the woofers to the mid and high amplifier. I defeated the active crossover. The active only adjusted the gain. I used the stock passive crossover to adjust the low pass filtration. The sound is definitely more grainy. There is now a notable hash. As active only, and the woofers in series for 16 ohms, the sound is more clear, less hash. Through the passive in parallel mode for 4 ohms, the sound is grainy, but, it has more body and a sense of umph. Not necessarily more dynamic. Just more weight and body that is moving.
I am not sure if this is the 16 ohm vs 4 ohms. Or cabling. The cables change when in series.

 

[morricab]

I tried using the active crossover to level match the amp for the woofers to the mid and high amplifier. I defeated the active crossover. The active only adjusted the gain. I used the stock passive crossover to adjust the low pass filtration. The sound is definitely more grainy. There is now a notable hash. As active only, and the woofers in series for 16 ohms, the sound is more clear, less hash. Through the passive in parallel mode for 4 ohms, the sound is grainy, but, it has more body and a sense of umph. Not necessarily more dynamic. Just more weight and body that is moving.
I am not sure if this is the 16 ohm vs 4 ohms. Or cabling. The cables change when in series.

Sorry, you need a diagram or something because it is practically impossible to understand what it is exactly you are doing.

 

[Ron Resnick]

I tried using the active crossover to level match the amp for the woofers to the mid and high amplifier.

Why level match?

As long as you have the flexibility to drive each amplifier separately, why not woofer cook (or tweeter cook) to achieve a custom frequency response perfectly suited to your personal preference?

PS: I am puzzled why a passive filter solution would be grainier than an active filter solution, unless, perhaps, it's due to a significant difference in parts quality?