I have an IB and my crossover was at 40hz. I found this to be too annoying. Although the low frequencies come through how I want them to, upper bass seems dominant. I have floorstanders to do bass duty, so how can I keep the bass outta my ceiling IB?
I use pre out off of my main amp, followed by a Linkwitz 24db low pass, yesterday I changed the values to give me 18.04hz, I figured this would smooth over the upper bass and allow some lo stuff still to get through, and a variable gain block to lift the output being as low frequencies are usually quiet in the recording. Now I don't hear nothing??
Whats up with that???
Cheers Mike
I use pre out off of my main amp, followed by a Linkwitz 24db low pass, yesterday I changed the values to give me 18.04hz, I figured this would smooth over the upper bass and allow some lo stuff still to get through, and a variable gain block to lift the output being as low frequencies are usually quiet in the recording. Now I don't hear nothing??
Whats up with that???
Cheers Mike
Hi RobWells
I had no EQ, just a input mixer, 24db Linkwitz low pass and some gain. I used Rod Elliott's circuits. I wish I could afford a Digital EQ, that ain't gonna happen for a while, hence the traditional analogue circuits.
I'm just using a single 12" car driver in the corner of my ceiling. In the opposite corner, on the floor I have my sofa, here the output is most potent, the bedroom upstairs gets vibrated and things begin buzzing. I play a fair bit of Drum n Bass of late and the IB plays all the bass lines as well as the low stuff. I don't mind, but her indoors doesn't give it much WAF. I thought I could just lower the crossover frequency, but its not working out that way. I've upped the gain and the cone flaps a bit, and I hear deep bass, but I gotta turn up the overall volume, guess I need EQ? Should I try Rod's http://sound.westhost.com/project28.htm ???
Cheers Mike
I had no EQ, just a input mixer, 24db Linkwitz low pass and some gain. I used Rod Elliott's circuits. I wish I could afford a Digital EQ, that ain't gonna happen for a while, hence the traditional analogue circuits.
I'm just using a single 12" car driver in the corner of my ceiling. In the opposite corner, on the floor I have my sofa, here the output is most potent, the bedroom upstairs gets vibrated and things begin buzzing. I play a fair bit of Drum n Bass of late and the IB plays all the bass lines as well as the low stuff. I don't mind, but her indoors doesn't give it much WAF. I thought I could just lower the crossover frequency, but its not working out that way. I've upped the gain and the cone flaps a bit, and I hear deep bass, but I gotta turn up the overall volume, guess I need EQ? Should I try Rod's http://sound.westhost.com/project28.htm ???
Cheers Mike
Hi RobWells
I didn't understand what you wrote. Would not adding boost at a low frequency help? In Wavelab, I can turn up the gain at any frequency, as my Avatar shows, in winamp, I have a plugin that lets me draw an EQ shape
Its an SPLX car sub, I have the T/S 's somewhere. I did have it in a Linkwitz Transform system, which richie00boy helped me design.
It sounds better without a box
Mike
I didn't understand what you wrote. Would not adding boost at a low frequency help? In Wavelab, I can turn up the gain at any frequency, as my Avatar shows, in winamp, I have a plugin that lets me draw an EQ shape
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Its an SPLX car sub, I have the T/S 's somewhere. I did have it in a Linkwitz Transform system, which richie00boy helped me design.
It sounds better without a box
Mike
What I meant was how do you know whether to boost at 20Hz or 35Hz(as examples) unless you measure what the sub is doing in room? and how much boost is needed?.
Rob.
Car drivers tend to start rolling off higher, hence the suggested LT circuit. Only prob is a single 12" won't do much at 30Hz.
You could try the LT on the IB but I'd suggest putting a steep high pass on it to protect the driver.
Another option would be to try a 6th order BP.
Rob.
Car drivers tend to start rolling off higher, hence the suggested LT circuit. Only prob is a single 12" won't do much at 30Hz.
You could try the LT on the IB but I'd suggest putting a steep high pass on it to protect the driver.
Another option would be to try a 6th order BP.
Hi RobWells
Thanks for replying. When it comes to it, do you have to have more drivers and watts to equal the spl of the mains? I know proper IB's have several drivers on a manifold with several hundred watts pushed into them, but surely you don't have to have all that? My mains probably only use a couple of watts, the amp I'm using for my IB is a car unit, bridged to maybe 70 watts. Maybe I'm missing the whole thing about Loudness, but I expect several hundred watts in my house, and I'm gonna need an Artexer/Plasterer to regularly patch up my walls and ceilings
Cheers Mike
Thanks for replying. When it comes to it, do you have to have more drivers and watts to equal the spl of the mains? I know proper IB's have several drivers on a manifold with several hundred watts pushed into them, but surely you don't have to have all that? My mains probably only use a couple of watts, the amp I'm using for my IB is a car unit, bridged to maybe 70 watts. Maybe I'm missing the whole thing about Loudness, but I expect several hundred watts in my house, and I'm gonna need an Artexer/Plasterer to regularly patch up my walls and ceilings
Cheers Mike
An infinite baffle system (or a dipole) does ovbiously not exhibit a flat frequency response without some compensation, but there is another problem with audible bass and (sub)woofers:
Frequencies in the 80HZ to 400Hz are so much more audible than the ones in the 20Hz to 80Hz range that no analog filter of reasonable order allows to attenuate them below perception. 12dB/oct leaves them barely at the same perception level. 24dB/oct provides some attenuation. Analog filters above 24dB/oct are not recommended due to the increasing group delay.
My advice is to ensure that there are no peaks or nasty out of band resonances in the low frequency system and to place the midbass system near.
Frequencies in the 80HZ to 400Hz are so much more audible than the ones in the 20Hz to 80Hz range that no analog filter of reasonable order allows to attenuate them below perception. 12dB/oct leaves them barely at the same perception level. 24dB/oct provides some attenuation. Analog filters above 24dB/oct are not recommended due to the increasing group delay.
My advice is to ensure that there are no peaks or nasty out of band resonances in the low frequency system and to place the midbass system near.
Re: Hello
Hi,
No. The low pass is tailored to include the baffle loss.
http://82.95.237.142/mhsoft/spk_calc.asp#newqts
how much extra power depends on the series resistor.
See MJK'S open baffle articles here : http://quarter-wave.com/
/sreten.
mikee55 said:
Sreten, are you saying put a highpass infront?
How much power, and how do I calculate the resistor.
Thankyou, Mike
Hi,
No. The low pass is tailored to include the baffle loss.
http://82.95.237.142/mhsoft/spk_calc.asp#newqts
how much extra power depends on the series resistor.
See MJK'S open baffle articles here : http://quarter-wave.com/
/sreten.
New Qts
Hi all, I had a go at the calculator. Does it look right.
Cheers Mike
Hi all, I had a go at the calculator. Does it look right.
An externally hosted image should be here but it was not working when we last tested it.
Cheers Mike
Hello
Just changed the Xover frequency to 23hz, and have a reasonable compromise. I want to understand more, about open baffles. I think, I could replace my Mordaunt Short MS40's with some OB units??
I'd be lucky if I can use the drivers from the M Shorts. Thought provoking.
Thank you all for your help.
Mike
Just changed the Xover frequency to 23hz, and have a reasonable compromise. I want to understand more, about open baffles. I think, I could replace my Mordaunt Short MS40's with some OB units??
I'd be lucky if I can use the drivers from the M Shorts. Thought provoking.
Thank you all for your help.
Mike
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