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They've never built a subwoofer I would have any interest in owning, personally. I didn't say their designs are terrible. They aren't that special either. And they aren't going to be the best option in any or every particular scenario. In this case, you have the Alpine Type X which uses Scanspeak sourced drivers, who is one of the most respected speaker companies in the world. The Alpine Type R uses some interesting technologies such as a split gap motor with shorting ring designed to reduce distortion. And then the Sundown, which I don't see anything "special" about and they use an excessively high crossover point (probably because of cheaper tweeter that can't cross low) but you like them because of the name that's stamped on the box.......

Go with the biggest you can fit, no need to start off small just in case you want to upgrade later.

Happy Birthday man, have a good one!

It's a hell of a long process to do it by hand but you can use the below equations to figure by hand. SI (mks) units. ^ denotes exponentiation. LOG() is base 10. 5.1 Constants pi = 3.14159265359 c = speed of sound in air (345 m/s) Ro = density of air (1.18 kg/m^3) 5.2 Closed-Box Systems Vb = Vas/Vr Fb = Qr*Fs F3dB = Qr*Fs*((1/Qb^2-2+((1/Qb^2-2)^2+4)^0.5)/2)^0.5 Fmax = c/(pi*0.83*Dia) dBpeak = 20*LOG(Amax) Par = K1/Amax^2 Per = Par/(Gno) Gno = 10^((SPL-112)/10) PeakSPL = SPL+10*LOG(PEmax) Sd = pi*(Dia*0.83)^2/4 Vd = Sd*xmax Amax = Qb^2/(Qb^2-0.25)^0.5 for Qb >(1/2)^0.5, 1 otherwise K1 = (4*pi^3*Ro/c)*Fb^4*Vd^2 K2 = 112+10*LOG(K1) Vr = Qr^2-1 Qr = (1/Qts)/(1/Qb-0.1) Frequency-dependent equations: Fr = (F/Fb)^2 dBmag = 10*LOG(Fr^2/((Fr-1)^2+Fr/Qb^2)) Pmax = K1*((Fr-1)^2+(Fr/Qb^2))/(Gno) SPLmax = K2+40*LOG(F/Fb) Thermally-limited RMS SPL = PeakSPL+dBmag 5.3 Ported Box Systems Vb = 20*Qts^3.3*Vas Fb = (Vas/Vb)^0.31*Fs F3dB = (Vas/Vb)^0.44*Fs Fmax = c/(pi*0.83*Dia) dBpeak = 20*LOG(Qts*(Vas/Vb)^0.3/0.4) Par = 3*F3dB^4*Vd^2 Per = Par/(Gno) Gno = 10^((SPL-112)/10) PeakSPL = SPL+10*LOG(PEmax) Dmin = (Fb*Vd)^0.5 Lv = 2362*Dv^2/(Fb^2*Vb)-0.73*Dv Sd = pi*(Dia*0.83)^2/4 Vd = Sd*xmax K1 = (4*pi^3*Ro/c)*Fs^4*Vd^2 K2 = 112+10*LOG(K1) Frequency-dependent equations: Fn2 = (F/Fs)^2 Fn4 = Fn2^2 A = (Fb/Fs)^2 B = A/Qts+Fb/(7*Fs) C = 1+A+(Vas/Vb)+Fb/(7*Fs*Qts) D = 1/Qts+Fb/(7*Fs) E = (97/49)*A dBmag = 10*LOG(Fn4^2/((Fn4-C*Fn2+A)^2+Fn2*(D*Fn2-B)^2)) Pmax = (K1/Gno)*((Fn4-C*Fn2+A)^2+Fn2*(D*Fn2-B)^2)/(Fn4-E*Fn2+A^2) SPLmax = K2+10*LOG(Fn4^2/(Fn4-E*Fn2+A^2)) Thermally-limited RMS SPL = PeakSPL+dBmag

Have good one! Maybe a cold one...

Happy Birthday

Definitely not worth spending the money for that particular upgrade, especially for the minimal audible difference in a daily driver.

Happy Birthday!

Then buy something random as used. If you aren't willing to try and search then it's a crap shoot anyways. I like how you ignored my other comment which of course would easily resolve your 123.

Box volume no. Driver xmax and tuning frequency.

In my opinion it's definitely not worth it. You could sell the zcon. Order a pair of 15" zcons, build a new enclosure, and actually end up with a lot more output. The kicker is: you'd end up spending less than $1200

It CAN (not "likes") handle more power. I would put my money on the SSD being better in every way than the Sundown.

IF you were a student, you'd be in detention researching this, lol. i'm gonna try to cut 5 more baffles today for 2 speakers, assuming they are all cut right, etc. If all goes well, then i may have time to make template for next baffle for other set of 8s and cut them. Hell, i'm not doin anything else today.

It's peanut butter jelly time! Say what!

Taken on Friday the 31st of August. Finally have internet again!