Fi SSD18 has the best $/L displacement...

[jefflam79]

We should add the SSD series subs to the comparison chart. These seem to get overlooked by the Q18 and the Mach 5 drivers.

Driving myself crazy trying to find a driver to fit my situation I decided to just do some calculations and find out what driver has the best $$$/Displacement ratio. Naturally for many people it has been the Mach5 18". But for me the Mach 5 has a $43/L ratio when shipping is factored in (and that's if I buy 4 and get the discount).

The SSD18 has the best ratio at $38/L with a displacement of 6.229L.

The SSD15 has the second best at $43/L with a displacement of 4.8138L.

My question is... Why do these drivers get overshadowed by the Q series and the Mach 5 drivers?

Obviously the Q series is the top of the line and cream of the crop but besides a little added Xmax and displacement, is there any other reason to go with the Q series over the SSD if the SSD provides you enough displacement?

[ThomasW]

The SSD 18" has 5L of displacement

[ginmtb]

Interesting - I did the conversion of the displacement and got the same numbers Jeff did:

0.17 ft3 = 4.81L
0.22 ft3 = 6.23L

I updated the comparison chart to reflect these, but maybe you know something Thomas that we don't about these drivers.

[jefflam79]

Hmm... I thought I did it right...although i'm not quite as experienced as many of you here. Perhaps one of you can double check for us...

www.ficaraudio.com

[chrisbee]

What is involved in F1's configuration for IB use?

Thanks

[norpus]

According to my calc, 1210cm2 x 4.2cm = 5.08ltrs for SSD
The Q18 has same Sd and xmax as Avalanche 18 which is 6.53L

[mcwhorter]

The SSD18 series is still a good value at $47.05/L ($239/5.08L).
It fall right below the Q18 at $45.47.

I love my pair of Q18's. It's almost tooo much. The SSD line would have probably done me just fine. I didn't realize just how loud 105 db is. My walls start flexing, pictures rattle, glasses on the bar vibrate at a volume around ~102db. Much more than that and the WAF goes waaayyy down.

[mmoeller]

There was mention of adjustments in the construction of this driver to have a lower Q for IB. What is the Q for the Fi18 IB drivers? For that matter what are the rest of the TS params?

[mcwhorter]

This is what Scott did for my 2 Q18s.

Single 4 ohm voicecoil
Re 2.8 Ohms
Fs 22.0 Hz
Qms 5.44
Qes .56
Qts .51
Mms 345
Cms 1.52X10^-4 m/N
Vas 310.2 l
SD 1210 cm^2
Bl 15.41
SPL 89.6 1W/1m