hello, guys. Need of your knowledge and advise.
I currently have 2 yamaha DXR15, and i wanted to add subwoofers. The system is mostly used weekends, outdoors, sometimes 150 people max. Weddings, 15 nieras, Pool parties or Birthdays.
I got a good deal on 2 reflex cabinets, about 8cu ft of volume each. And they had only one JBL 2241h 18" sub, , the other cabinet is empty, i powered it with an inuke6000dsp. I Set crossover, filters. And gain.
The sub is very musical, and shines above 50hz or so. but below that frecuency it lacks, or seems like it gets clipped quite easily on the lows of 35hz or so. it seems it doesnt like below 38hz??
I really dont want to spent that much on subs, and will like to have two sinche i have two cabinets.
Do you think adding a 2nd 2241H will be the best? Or should i sell it, and look for another pair of subs? I was looking at the Celestion FTR4080HDX or the FTR4080FD.
There is also a clone of the B&C TBX100 on ebay, it has good reviews.
Help apreciated, from Baja California. mexico. Sorry if my english is not good enough.
I currently have 2 yamaha DXR15, and i wanted to add subwoofers. The system is mostly used weekends, outdoors, sometimes 150 people max. Weddings, 15 nieras, Pool parties or Birthdays.
I got a good deal on 2 reflex cabinets, about 8cu ft of volume each. And they had only one JBL 2241h 18" sub, , the other cabinet is empty, i powered it with an inuke6000dsp. I Set crossover, filters. And gain.
The sub is very musical, and shines above 50hz or so. but below that frecuency it lacks, or seems like it gets clipped quite easily on the lows of 35hz or so. it seems it doesnt like below 38hz??
I really dont want to spent that much on subs, and will like to have two sinche i have two cabinets.
Do you think adding a 2nd 2241H will be the best? Or should i sell it, and look for another pair of subs? I was looking at the Celestion FTR4080HDX or the FTR4080FD.
There is also a clone of the B&C TBX100 on ebay, it has good reviews.
Help apreciated, from Baja California. mexico. Sorry if my english is not good enough.
2241H is really good driver, no doubt about that. Where did you tested them? Inside, outside? Room acoustics has really big effect for bass response. Trying different positions is a good start. Usually, two subs will help a lot compared to single one!
Have you measured the tuning frequency of the box (port size/length) ? 8-10cuft is ok for 2241H but if it is tuned somewhere around 50-60Hz, do not except big SPL levels lower than 45-50Hz.
Have you measured the tuning frequency of the box (port size/length) ? 8-10cuft is ok for 2241H but if it is tuned somewhere around 50-60Hz, do not except big SPL levels lower than 45-50Hz.
Tonskulus is right, the 2241 is not a bad driver, but to do well in the mid 30Hz range it really wants more than 8 cu ft, and to be tuned appropriately.
If you do put that driver in a bigger box tuned lower, you have to be careful not to apply too much power, as it will exceed Xmax at only 300W or so around 50Hz.
A more modern driver like B&C's 18RBX100 will be able to get louder over the same frequency range in a smaller box, but will need more power to do it. The port will also have to be bigger to support that extra SPL.
Note these sims assume that small signal behaviour scales up linearly with power - it doesn't, so the exact shape of the response and max SPL will be a bit different than predicted here. The relative difference between the 2 drivers should be broadly proportional all the same.
If you do put that driver in a bigger box tuned lower, you have to be careful not to apply too much power, as it will exceed Xmax at only 300W or so around 50Hz.
A more modern driver like B&C's 18RBX100 will be able to get louder over the same frequency range in a smaller box, but will need more power to do it. The port will also have to be bigger to support that extra SPL.
Note these sims assume that small signal behaviour scales up linearly with power - it doesn't, so the exact shape of the response and max SPL will be a bit different than predicted here. The relative difference between the 2 drivers should be broadly proportional all the same.
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Anyway, 8-10cuft tuned to 25-30Hz should be a good start for 2241H - as recommended by JBL. Assuming, you really want some useful SPL down to 30-35Hz.
I tested the subwoofer outside in the place where it will play.
External dimension of the box is 25"x25"x24", its made of 3/4 Birchwood.
and port is area is (22"x 3.5") porth depth 21".
And it has polyfill.
With the EQ flat, on low volume you can easilly tell the box is tuned to 38hz,
also, also the impedance is lowest on that frecuency.
So do you guys think adding a 2nd 2241 will be best?
What do you think of the Celestion FTR 4080HDX i like them because
they are around 220dls, and they are used on the QSC 181KW.
External dimension of the box is 25"x25"x24", its made of 3/4 Birchwood.
and port is area is (22"x 3.5") porth depth 21".
And it has polyfill.
With the EQ flat, on low volume you can easilly tell the box is tuned to 38hz,
also, also the impedance is lowest on that frecuency.
So do you guys think adding a 2nd 2241 will be best?
What do you think of the Celestion FTR 4080HDX i like them because
they are around 220dls, and they are used on the QSC 181KW.
Tune the port lower so that the driver doesn't unload at the freq you want to go down to and see if that solves your problem.
The Celestion FTR 4080HDX has about the same Xmax as the JBL, 8mm vs 7.62, a little more power handling, smaller VAS, so could be a slight improvement.
Doubling either driver & power will give you around 6dB more output, but going to a driver like David Morison suggested, the BC 18RBX100, could do near that in one box. More expensive, but "you get what you pay for".
That said, with JBL, much of what "you pay for" is the name...
Regardless of what driver you choose, it won't put out much below Fb (box tuning, excursion minima), so use a 24dB BW HP filter a few Hz below to keep the cones from flapping below 38 Hz.
Cheers,
Art
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