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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Strengths / Weaknesses of a TL subwoofer? posted by WithTarragon on December 20, 2009 at 08:58:39:
Mixing different types of bass cabinets can only lead to grief.
The phase shift on the low end is different, due to the differing slope of the bass roll-off. Thus, the bass energy from the different types of bass cabinets will not sum, and often will cancel out at certain frequencies.
Trying to mix horn loaded bass cabinets with T-line loaded bass cabinets is just about the worst combination, due to the completely different roll-off characteristics. Most horn-loaded bass designs try to extend the horn action down as low in frequency as possible, resulting in one of the steepest roll-off slopes around (approx. 36 dB/oct), while the T-line approximates a 6 dB/oct roll-off for the first portion of it's roll-off, gradually converting to a 12 dB, then 24 dB. The net phase shift throughout the bass roll-off region is completely different, and will not sum except at a few certain frequencies.
Mixing horns with different cut-off frequencies will also be a problem, as will mixing bass reflex cabinets with different tuning frequencies, etc. Same thing: phase responses that do not track with each other.
If you like the sound of your existing horns, then the best way to increase the quantity of the bass is to add identical models on each channel. This will also extend the low frequency horn cut-off a little lower, due to mutual coupling.
There really isn't a good way to extend it significantly lower without adding a crossed-over sub-woofer, and even then, you still have to try and match the sub to the horns(not a trivial task) or the results will be less than satisfying.
Jon Risch
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Follow Ups
- It's a No Go from the start - Jon Risch 21:02:00 12/27/09 (0)
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