It wonders me though, using grills and still miss the opportunity to use PA drivers which mainly are not designed for looks but for other interesting technical properties. Why did you choose to use 'hifi' drivers if you are going to cover them up unvisible ? As in 'hifi' drivers considerable design effort has been put to outlook.
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Is it possible for a 2 way OB to have extension to 80hz with 7 or 8" midbass drivers?
Maybe 2- 7" with one of the two sealed and crossed passively with a single inductor so it can be run with two amp channels actively?
Or option two, with a wide/tall baffle to extend the range of a 7" or 8" driver?
Maybe 2- 7" with one of the two sealed and crossed passively with a single inductor so it can be run with two amp channels actively?
Or option two, with a wide/tall baffle to extend the range of a 7" or 8" driver?
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Yes, but it depends how loud you want it to go! If baffle width isn't an option a larger drive unit could be used to advantage of course- there are lots of decent cheap ones.
I guess its really a tech question and not to find an alternative way around it.
What does it take to get a 7 or 8 incher to get to 80hz? IE what baffle size? How much EQ?
Nice work Sebastian, StigErik has a lot to answer for 😀
My speakers don't look anything I imagined they would thanks to his influence. His are definitely a benchmark for OB.
Did you try crossing them over lower say somewhere around 150Hz?
95db.
I'm trying to understand the science behind baffle size and low frequency.
In othr words can you plaese tell how the baffle relates to low frequency.
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The lastest project, 10x8" midbass line arrays in L-baffle:
An externally hosted image should be here but it was not working when we last tested it.
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Here, the front baffle is 36cm wide and the side 15cm deep.
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.
First that stain color is amazing.
What frequency do you reach down to with those 8's without eq?
Here are the sensitivity and linearity measurements done at 2,83V from the listening spot, ~2,5m away from the speakers. Both are done completely without eq, including no 6dB/oct dipole compensation, there is just LR4 low pass at 800Hz.
Right
Left
Im impressed with the output and efficiency. A row of 8's or 10's with an RD 50 may be the way I go.
What 8" driver is that? What are the specs (Fs, Qts, Vas)?
Thanks for sharing the results.
Yep they are very voltage efficient, I have wired arrays to 3.2 ohm nominal impedance. The driver is Gradient Axis AXT-08, basically paper/kevlar cone version of the Dayton Audio RS-series with a slightly smaller xmax(I think it's smaller). Driver has been tested in 2011/3 Klang & Ton. Basically an accurate and punchy woofer with high sensitivity, low moving mass, strong motor and high Qms. Efficiency is about 92dB/w, qts 0.3, Mms 21 grams, Vas 50l, Le 0,4mH, voice coil diameter 39mm, xmax around +/- 4mm (+/- 5,5mm mathematical/realistic).
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