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Old 23rd March 2020, 05:26 PM   #2921
architect is offline architect  Netherlands
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with an 18 inch up to 300hz you can only put it in a flat baffle because of problems with resonances

I use a tube behind it for deeper lows but above 100Hz there are resonances
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Old 23rd March 2020, 06:24 PM   #2922
gadut is offline gadut  Indonesia
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Quote:
Originally Posted by Kjeldsen View Post
Yes, it's easy with small woofers, but many open baffles have 15 inch to horn mid/tweeter crossed at 700-1000 hz. When I try 300 or higher it just sounds awfull
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with an 18 inch up to 300hz you can only put it in a flat baffle because of problems with resonances

I use a tube behind it for deeper lows but above 100Hz there are resonances
thanks guys for your insights, i had been wondering why my 21" in flat baffle can only sounds good when i set hpf 80Hz at maximum. many suggestion says to lift it up to 300Hz but it never sound right to me. because i'm using 5" fullrange hence adding 12" woofer to fill 80-320Hz is very usefull
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Old 23rd March 2020, 06:28 PM   #2923
architect is offline architect  Netherlands
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my 22cm has to work hard to get to 100 Hz with only little baffle
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Old 24th March 2020, 05:51 PM   #2924
architect is offline architect  Netherlands
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OBSP open-baffle-speaker-project - forum.zelfbouwaudio.nl

B&C 18SW115-8
Seas Excel W22
Scanspeak 10F-4424G00
Mundorf 17D2.2

temporary Inuke 6000 dsp for lows
minidsp OpenDRC-DA8
UCD400/180HXR
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Old 1st April 2020, 07:07 PM   #2925
WBS is offline WBS  United States
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Quote:
Originally Posted by architect View Post
with an 18 inch up to 300hz you can only put it in a flat baffle because of problems with resonances

I use a tube behind it for deeper lows but above 100Hz there are resonances
Great article! Although I don't read Dutch, I enjoyed the images.

How did you calculate the length of the tube behind the woofer? I have a pair of 18 inch woofers I'd like to set up like that.
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Old 1st April 2020, 09:11 PM   #2926
architect is offline architect  Netherlands
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the tube was 42cm, but now it is 30cm
I had trouble with resonances

crossovers are now at
110Hz
1000Hz brickwall
4000hz brickwall

minidsp opendrc da8 is great, phasecorrection with rephase is great too
the last frequencies at the low end I correct in APO EQ on my computer

snappy sound, really nice
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Old Yesterday, 09:58 AM   #2927
Kjeldsen is offline Kjeldsen  Denmark
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Try dampening the tube, if you haven't done it already
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Old Yesterday, 12:14 PM   #2928
architect is offline architect  Netherlands
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the 42 cm tube was damped,
the 30 cm undamped is a good improvement
today I put some felt damping indside,
I still have to make a measurements to see the difference
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Old Yesterday, 12:24 PM   #2929
Kjeldsen is offline Kjeldsen  Denmark
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Ok. By dampening I mean stuff the tube entirely with filling. This will decrease sound from back and increase sound from front. The figure of eight will change. In my room this is a good thing. But our rooms are all different, so there is no right or wrong
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Old Yesterday, 03:01 PM   #2930
WBS is offline WBS  United States
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I wonder what the effect of a cone opening to the back wall would have vs. the cylinder (tube.) Do you think that might reduce your unwanted resonances?
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