Hi all,
Measuring TAD TL-1601, I found its frequency response missing 100Hz to 300Hz range. it has a very deep "abyss" in that range (~15dB).
Pls check this pic.
I need advice on how to cross this bass driver, i have tried to cross it with third-order, fourth order crossover (500Hz) but that "abyss" is still there.
Thanks all.
Measuring TAD TL-1601, I found its frequency response missing 100Hz to 300Hz range. it has a very deep "abyss" in that range (~15dB).
Pls check this pic.
I need advice on how to cross this bass driver, i have tried to cross it with third-order, fourth order crossover (500Hz) but that "abyss" is still there.
Thanks all.
Can you please tell us a little bit on how you measurement is made like mic distance, boundary conditions etc.
Its 1 meter from the speaker and 1 meter from the ground, 1.8v
I have measured many TAD bass drivers, 1601A and 1601C. They all have the same problem in this frequency range.
So what do you suggest? Its the same issue no matter how. I have tested so many TAD bass drivers.
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Cut your gate in earlier, you won't be able to measure your bass in the room like that. You'll have to instead add subwoofers to diversify the source location, or rearrange your current sources to work with the walls,
Hi, if i cut earlier, say 100Hz, ill need to add a mid bass driver for 100hz to 500Hz that my mid horn cannot cover. I cannot change the room, you know. I have to measure as it is, the speakers have to adapt to the room. What i need a solution for crossover.
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No, I mean cut at 3ms.
If you fix your acoustics by using subwoofers or changing your sources... then you can cross where you like. Is this something you would do?
So except for adding subs, there's no solution for this issue? All i need is a crossover technique that can solve this issue, even +10dB or 5dB is good enough.
You can rearrange your sources to work with the walls.. or you can cross away the problems and add another range that works with your room.
I don't understand what you mean +10dB or 5dB. Is this the error you will accept? You can force it if you want. It will vary around your room.
I don’t believe that is the response of the woofers. The 15dB saddle is likely the baffle coupled with the floor in addition to nearest wall surface. Together, these may be introducing destructive interference, ie: a broadband standing wave.
If you near mic the woofer at 3cm and measure it again at 3m, does the dip change? It should. This situation should be correctable with acoustic treatment and maybe lifting the woofer enclosures.
P.S Those are some serious looking speakers.
If you near mic the woofer at 3cm and measure it again at 3m, does the dip change? It should. This situation should be correctable with acoustic treatment and maybe lifting the woofer enclosures.
P.S Those are some serious looking speakers.
It is a floor reflection destructively interfering with your woofers output. Technical term is SBIR, Speaker Boundary Interference Response. Has nothing to do with drivers themselves. Years ago I had a similar issue with 12" woofer 55 cm above the floor:
"As is" there is no way to fix it - no reasonable acoustic absorbtion is going to be effective at 200 Hz - but at listening position the dip is not going to be so severe. However, you can turn a vice into a virtue by turning your woofer box sideways - this way floor reflection will reinforce your woofers output, creating a short line array. Kimmo Saunisto had a 2x18" system empoying this trick (and cardioid enclosure to boot). He crossed at 400 Hz with a coaxial horn.
https://web.archive.org/web/20200512164727/http://kimmosaunisto.net/KS-1804/KS-1804.html
Look how smooth and even the in-room bass response is:
(well, I understand you probably aren't going to do this; still worth it to show the elegance of such solution IMO)
I guess you have tested them all the same in terms of height above foor and distance ? Right ?
You can do a quick and dirty try to change the floor reflection behaviour by turning it sideways so that the driveras get vertically aligned.
Regards
Charles