Yes, I agree with the video. Multiple woofers in one box can cause phase shift and cancellation if not designed optimality.
What's the secret behind "slim" open baffles from JAMO and SPATIAL AUDIO??
- Thread starter Naveenbnc
- Start date
Yes, I agree with the video. Multiple woofers in one box can cause phase shift and cancellation if not designed optimality.
as diyaudio said.... high SPL can be achieved with multiple small drivers.
But the bass that comes from a well designed subwoofer with a bigger driver, sounds different (deep) from the bass that comes from a well designed subwoofer using multiple small drivers.
(I am assuming the above statement...subject to correction)
taking the example shown in the video..... one huge drum Vs multiple small drums
But the bass that comes from a well designed subwoofer with a bigger driver, sounds different (deep) from the bass that comes from a well designed subwoofer using multiple small drivers.
(I am assuming the above statement...subject to correction)
taking the example shown in the video..... one huge drum Vs multiple small drums
The video gives an analogy, thats all. It is not backed by credible data.
There are very fine examples of multi speakers and bass is no different. I think I already shared some of the below links earlier.
https://www.diyaudio.com/forums/full-range/242171-towers-25-driver-range-line-array.html
https://www.mcintoshlabs.com/
https://www.trueaudio.com/array/
http://gr-research.com/ob-7.aspx
http://www.cordellaudio.com/loudspeakers/athena.ppt. See slide 9, the regular T/S parameters are no more an issue. Its equalized. Do note this one uses typical 5.25" quad woofers to get down to 35hz, -3dB. Very smart.
It really depends on how the system is put together. Its the system that matters, not individual components, within reason.
And regarding a single big driver sounding different than multiple small drivers, it may happen, its very hard to figure out what causes it. Its often the harmonics (distortion) that provides a signature to the system. If one exceeds the Sd of the bigger driver by a sufficient margin with the smaller driver array then they must sound alike. Also the bigger driver has different directivity higher up so its distortion signature is be highly different.
Also multiple smaller driver system's has a larger total coil area and will have better thermal compression performance than the single driver system, reasonably speaking.
There are very fine examples of multi speakers and bass is no different. I think I already shared some of the below links earlier.
https://www.diyaudio.com/forums/full-range/242171-towers-25-driver-range-line-array.html
https://www.mcintoshlabs.com/
https://www.trueaudio.com/array/
http://gr-research.com/ob-7.aspx
http://www.cordellaudio.com/loudspeakers/athena.ppt. See slide 9, the regular T/S parameters are no more an issue. Its equalized. Do note this one uses typical 5.25" quad woofers to get down to 35hz, -3dB. Very smart.
It really depends on how the system is put together. Its the system that matters, not individual components, within reason.
And regarding a single big driver sounding different than multiple small drivers, it may happen, its very hard to figure out what causes it. Its often the harmonics (distortion) that provides a signature to the system. If one exceeds the Sd of the bigger driver by a sufficient margin with the smaller driver array then they must sound alike. Also the bigger driver has different directivity higher up so its distortion signature is be highly different.
Also multiple smaller driver system's has a larger total coil area and will have better thermal compression performance than the single driver system, reasonably speaking.
When we are talking about bass in OB -
I prefer a bigger driver having the same SPL what smaller drivers collectively can reach to.
Because, smaller drivers use higher Xmax to achieve the SPL, which brings chances of distortion.
I prefer big bass drivers with high Qts, low Xmax (3mm to 5mm max) and high SPL. I can not hear a kick drum as a kick drum when a tiny 6inch drivers produce that. The tone of a kick drum will there be from the sound of a 6inch driver, the timbre will not (much) be there. You may mistake it for a Congo sound (the bass one).
For me, 10 inch is the minimum size for mid range (250 to 4K Hz IMO), 15 inch is the right size one for below 250 Hz LFs.
Difference of SPL (6 to 10 dB) between mid and low frequency drivers is crucial for OB, specially for slim ones. LF drivers need to be of higher SPL. To achieve this difference in SPL, two LF drivers per baffle are sometimes used.
Please read Sixmoons review of Jamo R909, the use of back cover to increase bass presence is nicely hinted there.
Jamo is not so slim. Please remember, baffle width is inclusive of driver.
I prefer a bigger driver having the same SPL what smaller drivers collectively can reach to.
Because, smaller drivers use higher Xmax to achieve the SPL, which brings chances of distortion.
I prefer big bass drivers with high Qts, low Xmax (3mm to 5mm max) and high SPL. I can not hear a kick drum as a kick drum when a tiny 6inch drivers produce that. The tone of a kick drum will there be from the sound of a 6inch driver, the timbre will not (much) be there. You may mistake it for a Congo sound (the bass one).
For me, 10 inch is the minimum size for mid range (250 to 4K Hz IMO), 15 inch is the right size one for below 250 Hz LFs.
Difference of SPL (6 to 10 dB) between mid and low frequency drivers is crucial for OB, specially for slim ones. LF drivers need to be of higher SPL. To achieve this difference in SPL, two LF drivers per baffle are sometimes used.
Please read Sixmoons review of Jamo R909, the use of back cover to increase bass presence is nicely hinted there.
Jamo is not so slim. Please remember, baffle width is inclusive of driver.
Weltersys over diyaudio has explained very nicely, he has provided much more data in response to a similar question, only the scale is different.
https://www.diyaudio.com/forums/sub...drivers-vs-single-driver-sub-post3100986.html
https://www.diyaudio.com/forums/sub...drivers-vs-single-driver-sub-post3100986.html
many people in the comments section also said the same ... some people disagreed as well !!
he didn't provide any credible data.
looked up Q acoustics 2070Si subwoofer. The page says:
Twin cones for added punch
"Rather than using one large cone, the 2070Si uses two, smaller cones. This has the advantage of offering the same surface area as a larger cone, so giving you depth and rumble, but also improved speed of bass. Smaller twin cones can move faster and therefore offer a punchier sound with more accurate timing. Thanks to the built-in 150W digital amplifier, power and control are never an issue, either."
Freq response down to 35Hz.
Twin cones for added punch
"Rather than using one large cone, the 2070Si uses two, smaller cones. This has the advantage of offering the same surface area as a larger cone, so giving you depth and rumble, but also improved speed of bass. Smaller twin cones can move faster and therefore offer a punchier sound with more accurate timing. Thanks to the built-in 150W digital amplifier, power and control are never an issue, either."
Freq response down to 35Hz.
I have not seen a large FR driver 12+" doing frequency above 6KHz correct. In case you happen to use 12"+ drivers multi drivers looks the only option. That's why I settled for an 8" driver which has a low resonance frequency that handles both the bottom and top end seamlessly and I did not have to worry about crossovers.
A beautiful, well-constructed speaker with class-leading soundstage, imaging and bass that is fast, deep, and precise.
