Certainly, there is some space to save, and with double bin, few liters could be shaved off. But then it is 65kg, good luck with careful loading, navigating in small spaces and stairs and such(add wheels and something to grab on and you are at least back with weight and size as before with singles), if one speaker breaks, you have two pieces out of order basically, and such.
I was thinking that way to replace one 21" with two 15"s before. But while 18"s cost about $30-50 more usually, I said heck why would I not want that performance bump going with these larger ones for this price.
I could say if 21XL3000 had at least 42mm long coil, I might think about getting back to two 21"s. It was mostly quiet for five six years now, regarding my needs, and right at the moment I start making decisions and build, something comes up.
I was thinking that way to replace one 21" with two 15"s before. But while 18"s cost about $30-50 more usually, I said heck why would I not want that performance bump going with these larger ones for this price.
I could say if 21XL3000 had at least 42mm long coil, I might think about getting back to two 21"s. It was mostly quiet for five six years now, regarding my needs, and right at the moment I start making decisions and build, something comes up.
Fighting with cone excursion, loading, impedance profile and such, how about mass loaded ported design? Bad idea? Should increase excursion at tuning and decrease little bit above tuning.
Other than around Fb, cone excursion is what makes bass.
An increase of excursion at Fb is a reduction in potential output.
Limit the voltage with dynamic limiter that's safe when the DJ decides to drone the "hot" frequency for over 30 seconds or so.
An increase of excursion at Fb is a reduction in potential output.
Limit the voltage with dynamic limiter that's safe when the DJ decides to drone the "hot" frequency for over 30 seconds or so.
While I believe the total exchange could be slightly negative, I also have good reason to believe that because the cone is taking back some work from somewhat attenuated mass loaded resonator, the loss might be miniscule? It seems second test enclosure will be needed.
Interesting thread and lots of ideas.
I believe the best option in the single man / small crew live sound / professional market is to compromise on cost and then benefit from years of easy installation and superb sound quality plus peace of mind from rock solid reliability and very happy customers and no back injuries!
I suggest spending more on drivers on day one (partially off set by savings on cabinets) and use multiple small sealed box subs to achieve the best of all worlds.
116dB at 40Hz with just half rated power and only 8.5mm cone travel (16mm Xmax).
The attached sim shows what a single Precision Devices 21 inch driver does in a 100 litre 18mm birch ply box weighing approx 32.5Kg for a 50cm by 50cm by 40cm internal volume at half power and full power.
Low weight / small cabinet is ideal for single person live sound setups and dual / multiple subs with 4 Ohm loads broadens amplifier options. Sealed design simplifies DSP crossover and Eq set up and delivers ultra low distortion / critically damped and time domain accurate studio grade bass at live sound SPL’s.
Expensive, but the best in every other way.
I was thinking that too. 21" LaVoce's are great too. Well, we do not know about PD.2160's excursion behavior. The suspension is already stiff and noone from PD bothered to provide response with more data.
It is hard to grab on, but I basically chose two 18"s or possibly 19"s over one 21". Or rather four versus two. It might not be fair comparison, giving more love to double the amount of 18"s, but two 1700/3400Watt motors with 3dB more of excursion capabilities will outdo anything that the 21" was thinking it was doing. And the 21" is more expensive too, and in sealed box for low crest factor content it would be poorly cooled.
Physically, the 21" actually has to eat more power to displace the same air volume in a box, because of larger piston. So while it offsets itself off, more power compression for the 21" when it is put in a small box.
Once you compare it to the current ways, it will show as unfavourable.
But thank you for the proposal. Even if I am not likelyto materialise that, I will get back to that mathematically and in the sims.
It is hard to grab on, but I basically chose two 18"s or possibly 19"s over one 21". Or rather four versus two. It might not be fair comparison, giving more love to double the amount of 18"s, but two 1700/3400Watt motors with 3dB more of excursion capabilities will outdo anything that the 21" was thinking it was doing. And the 21" is more expensive too, and in sealed box for low crest factor content it would be poorly cooled.
Physically, the 21" actually has to eat more power to displace the same air volume in a box, because of larger piston. So while it offsets itself off, more power compression for the 21" when it is put in a small box.
Once you compare it to the current ways, it will show as unfavourable.
But thank you for the proposal. Even if I am not likelyto materialise that, I will get back to that mathematically and in the sims.
