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Old 4th June 2005, 11:46 AM   #1
dan _s is offline dan _s  Israel
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Default what amp for NHT1259 woofer?

i built a woofer with a single NHT 1259 driver.
it's in a closed box, about 90 liter volume, cross over point at 200Hz and driven currently with one channel of an audiolab 8000a amp, said to have 60watt.
the speaker sounds very "wooly". far from "precise and dry" which is the word about this driver.
i checked sealing, it's good. i suspect amplification is not enough. the recommended power for the NHT 3.3 speaker , which has the same driver, is 30 to 300 watt, but madisound use at least 200w for the same.
any suggestions for the power needed for this woofer?

thanks!
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Old 4th June 2005, 05:55 PM   #2
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I can't beleive that it's a lack of power problem unless you are running the amp into clipping. If it sounds wooly a low volume levels, I would look elsewhere for the cause.

As to suggestions for the power needed, it depends on how loud you want it to go.
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Old 4th June 2005, 06:31 PM   #3
kinser is offline kinser  Israel
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dan_s,
Kinda off topic.. but were did you buy NHT drivers in israel? or is it from madisound? and how much did you pay for everything?

Thanks,
Kinser
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Old 4th June 2005, 06:45 PM   #4
kinser is offline kinser  Israel
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dan_s,

its me again...
Why dont you try Rod Eliotts P3A or low power version of P68
here are the links:
http://sound.westhost.com/project3a.htm - P3A
http://sound.westhost.com/project68.htm - P68

I hope this helps you...
Kinser
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Old 5th June 2005, 01:51 PM   #5
dan _s is offline dan _s  Israel
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Bill, the system does not clip. not even at high volume. the woofer sounds bad from minimum level. i guess this tells it's not a power/current issue.

i'll check sealing again. hope it's not a bad driver.

Kinser, i bought it about a year ago from madisound. cost me about 1000NIS with the shipping and VAT.
thanks for the links

dan
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Old 5th June 2005, 04:43 PM   #6
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Crossover freq at 200Hz but which order? With too shallow of a slope, I can understand wooly.
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Old 5th June 2005, 05:22 PM   #7
dan _s is offline dan _s  Israel
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Bill, it's 24dB per octave (linkwitz riley)



mingus does rule, i guess
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Old 5th June 2005, 05:44 PM   #8
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Well then, tell us about the crossover - acitve or passive?

Also remark on the enclosure construction.
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Old 5th June 2005, 06:51 PM   #9
dan _s is offline dan _s  Israel
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here goes

the box is as in the drawing attached, meassures are in centimeters, stuffed loosely with synthetic fibers, something called acrylan over here. the wire inside is simple copper 2.5mm section multicore wire.
the back is currently just screwed not glued, for adjustments
the crossover is a low level passive XM46 marchand unit . the two low frequency signal channels in the XO are bridged with two 10K resistors for a mono output.
i just don't have room for two woofers. since bass is weaker the the high signal, i put a 50K potentiometer at the high output for tonal balance.

as for mid and highs, it's two BG RD50 ribbons, set as monopoles, driven by a WAD kat6550 amp.

the source is marantz cd5000 as transport and 'deltec enlightment' DAC connected straight to the XO
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File Type: jpg woofer box 1.jpg (79.7 KB, 254 views)
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Old 5th June 2005, 06:55 PM   #10
dan _s is offline dan _s  Israel
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here's another photo of construction
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File Type: jpg woofer back.jpg (39.6 KB, 274 views)
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