Subwoofer Xover to high

[Emil]

Hey guys

The lowest xover setting for my subwoofer is 50 hz or at least thats what it says.

Looking for an inexpensive way to by pass the internal xover such as F-mods but they dont have a setting below 50hz.

Ideas?

[HAL]

What frequency are you trying to crossover at?  Do you need high pass and low pass for the mains and the subs if you bypass the sub crossover?  How many dB/Octave slopes for the filters do you need?  That info would help with the options.

[Emil]

What frequency are you trying to crossover at?  Do you need high pass and low pass for the mains and the subs if you bypass the sub crossover?  How many dB/Octave slopes for the filters do you need?  That info would help with the options.

Hi Hal
Planning on running the mains full range and having the sub bring up the bottom somewhere around 40hz.

How many dB/Octave slopes for the filters do you need? 
I dont know. Not even sure what that means

[Triode Pete]

Hey guys

The lowest xover setting for my subwoofer is 50 hz or at least thats what it says.

Looking for an inexpensive way to by pass the internal xover such as F-mods but they dont have a setting below 50hz.

Ideas?

Ideas? How about a solution?

Buy speakers that don't need a subwoofer! 

KISS Principle, Sir Emil! 

[Emil]

Hey guys

The lowest xover setting for my subwoofer is 50 hz or at least thats what it says.

Looking for an inexpensive way to by pass the internal xover such as F-mods but they dont have a setting below 50hz.

Ideas?

Ideas? How about a solution?

Buy speakers that don't need a subwoofer! 

KISS Principle, Sir Emil! 

K-Horns are out, Pete.

My Khornwalls have the 15 inch woofer but dont think the 8 watt   300B can't push them that low. 

[Triode Pete]

Hey guys

The lowest xover setting for my subwoofer is 50 hz or at least thats what it says.

Looking for an inexpensive way to by pass the internal xover such as F-mods but they dont have a setting below 50hz.

Ideas?

Ideas? How about a solution?

Buy speakers that don't need a subwoofer! 

KISS Principle, Sir Emil! 

K-Horns are out, Pete.

My Khornwalls have the 15 inch woofer but dont think the 8 watt   300B can't push them that low. 

Output transformers & the power supply are key. A well designed OPT should go down close to 20 Hz.

You're most likely hindered by the woofer / cabinet design. An original Cornwall can only go down to 38 Hz, due to cabinet (bass reflex) design...

[James Edward]

This sounds like a job for a REL Britannia B2 sub in mint condition. The rosewood finish enhances its ability to blend seamlessly with most quality loudspeakers.

[Emil]

This sounds like a job for a REL Britannia B2 sub in mint condition. The rosewood finish enhances its ability to blend seamlessly with most quality loudspeakers.

I wonder who may have one for sale? Hmmmm

[James Edward]

Did I not mention that? I'm sorry. 

[Emil]

I think I may have found it.

LP-1 Low pass for $39


http://www.hlabs.com/products/crossovers/index_files/Page384.htm

[tmazz]

I think I may have found it.

LP-1 Low pass for $39


http://www.hlabs.com/products/crossovers/index_files/Page384.htm

Emil is your plan yo use a LP filter to feed the sub and run the 300Bs to the Kornwalls full range? f so this might be usable. But there is no way I would ever use a low priced crossover like this for feed the main amp. Especially with the high sensitivity of your k-horns every little bit of distortion added by the xover will be hugely apparent through your speakers ans all of the great  300B sound will get trampled.

[Emil]

I think I may have found it.

LP-1 Low pass for $39


http://www.hlabs.com/products/crossovers/index_files/Page384.htm

Emil is your plan yo use a LP filter to feed the sub and run the 300Bs to the Kornwalls full range? f so this might be usable. But there is no way I would ever use a low priced crossover like this for feed the main amp. Especially with the high sensitivity of your k-horns every little bit of distortion added by the xover will be hugely apparent through your speakers ans all of the great  300B sound will get trampled.

I hear you, Tmazz. Speakers will run full range

[BobM]

Should be OK to try out, not a lot of $ if it doesn't work out. You are correct Emil, that the sub crossover point should be lower than the bottom end on your speakers.

[jimbones]

Should be OK to try out, not a lot of $ if it doesn't work out. You are correct Emil, that the sub crossover point should be lower than the bottom end on your speakers.

According to Sound Doctor your sub should come in around 80hz, not much lower. I forget his justification but I am sure it is published online somewhere.

[tmazz]

Should be OK to try out, not a lot of $ if it doesn't work out. You are correct Emil, that the sub crossover point should be lower than the bottom end on your speakers.

According to Sound Doctor your sub should come in around 80hz, not much lower. I forget his justification but I am sure it is published online somewhere.

That might be true if you were doing a true crossover and rolling off the bass to the main amp, as it would keep the woofers in the main speaker operating more in their linear range.  But I would think that if you are feeding a full range signal into a speaker that is good down to 38Hz using a LPF set to 80 Hz would result in too much bass in the 38-80 range. How much would depend on the slopes of the filter and the speaker rolloff, but I am pretty sure it would be too much.