@yakbob You're right; I had a spell of the ditzies. Drivers are only 12" after all. Just knew they were bigger than my mains, which I mistakenly remembered as 12" rather than their actual 10".
So at least they're not ill-regarded, just rare. Seems the right design for my constrained setup, once I've done the fine-tuning. Knowing now where the peaks are, thanks to @erik_squires, I can see the path forward.
No love for Tannoy Definition subs
I bought the big (& beautiful) Tannoy Definition dual-firing sub when they discontinued and went on closeout pricing. Because it has two active drivers firing in opposite directions, I figured this was this was designed as equivalent to two subs -- very useful for me as sub placement is a major limitation in my listening room.
Okay, I'm not dissatisfied, but this product is never discussed or even mentioned so far as I can tell. Does everyone just "know" it's junk and unworthy of mention? And is there any validity to my supposition that this should equal two subs (albeit both drivers are powered by the same 1k class D amp)? Really doesn't seem so, although comparison with two RELs is not really a feasible experiment for me. (Also, black boxes look ugly in my room).
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I'm not doubting you @hickamore but I thought the Definition subs were equipped with dual 12" drivers not 15" as mentioned. If the dual 12" model retailed for over $7k, I'd assume the dual 15" model would cost even more. ($9k?) At that price you'd have to drive past a lot of proven designs from the likes of REL, JL Audio, and Rythmik. That's probably the main reason you don't see a lot of discussion on the Tannoy sub, not that it's not worthy of discussion. |
Legacy tech guru advised me to let the towers run full-range with no high pass. They have a peak at 35Hz and fall off steeply below 32Hz. So I set the sub cross at 31Hz with -24db/oct descent above that point. Basically sub is just picking up octave 0. |
Thanks for the good news. EQ and room treatment just happened to be my two highest priorities, so will accelerate the timetable on those and meanwhile learn more about measurement & download the room simulator tool right away. Actually I have a little more driver surface -- dual 15" in this model, so that can't hurt. |
Hey, so lets get into the physics a little. The surface area of 1 12" driver = 116" squared The surface area of two 12" subs = 232" squared A single 18" sub = 255" squared So you have a box with a surface area between a single 15" and single 18" driver. That’s good. Because the drivers are co-located you don’t get the frequency response smoothing capabilities of multiple subwoofers. Ideally you could locate them so they smooth each other's peaks and valleys. So that’s not quite as good, but a single sub, with EQ and room treatment can be magical if properly done. To integrate this well, start by using the room simulator here. https://amcoustics.com/tools/amroc Try to put the sub and listening location OUTSIDE the first few room modes. Measurements are really going to be your friend. The next two tools are EQ and room treatments. |