AudioNervosa
Systemic Development => Speakers => Topic started by: Emil on January 08, 2017, 06:32:03 AM
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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?
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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.
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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 :lol:
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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! :rofl:
KISS Principle, Sir Emil! :lol:
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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! :rofl:
KISS Principle, Sir Emil! :lol:
K-Horns are out, Pete. :lol:
My Khornwalls have the 15 inch woofer but dont think the 8 watt 300B can't push them that low.
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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! :rofl:
KISS Principle, Sir Emil! :lol:
K-Horns are out, Pete. :lol:
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...
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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.
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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 :lol:
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Did I not mention that? I'm sorry. :duh
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I think I may have found it.
LP-1 Low pass for $39
http://www.hlabs.com/products/crossovers/index_files/Page384.htm
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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.
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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
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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.
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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.
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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.
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A high efficiency driver in a relatively small horn (for the wavelength) means flat 38Hz FR is a stretch. It is probably an optimistic F10 spec. The F6 (the -6dB rolloff freq) that you would use for the sub crossover freq is probably more like 45Hz. Crossovers sum flat if they cross (same amplitude) at F6, aka the -6dB frequency.
A horn's natural rolloff is -24dB per octave. That is the slope, it means it gets 24 decibels quieter when the frequency drops by one octave (cut in half.) It is important for the slope of the sub's low pass filter and the main speakers natural high pass rolloff to match in slope, so that you end up with a flat amplitude summation of both speakers thru the crossover band. This means set the sub slope filter to 24dB. I would try the sub turned down to lowest freq, see if the FR is flat from your listening position. Room modes, mfg extension exaggeration, and tolerance of the sub filter circuit could make it work without additional filters. Don't worry about a little boost around 40-60Hz, you'll like it.
If it has flattish FR but still doesn't sound "clear" or if it sounds muddy or blurred bass, then you need to adjust phase so the sub and mains play perfectly in sync and the sound arrives to ears at the exact same time. The easiest way to ensure that is to put the sub at same distance from ears as the mains, and set sub phase to zero. If you need to hide it, then try putting it behind your listening chair and adjusting the phase delay above zero until it sounds clear again. When it's close to you then you can turn it down and reduce room mode problems and lengthen reflection times. It's a great wtg. Below 80Hz you can't tell which direction the sound comes from so behind you works fine.
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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.
True, I didn't realize he was letting the mains roll off naturally. Def too much energy.