Need help comparing two subs, specs included

[ds0110 10+ year member]

Ive wanted a soundsplintert rlp since soundsplinter went out of business. I never thought id see a dual 2ohm in good condition for sale and now there are two for sale in the classifieds. However, I have a never used flatlyne sitting next to me that is supposed to be the best sq sub available if the hype is true... The box im going to use for this install holds one sub. Im trying to compare them to see if its worth the trouble of trading out/ selling what I have to get the best outcome.

I will be using 1.16cuft sealed box. 750watts. The goal being "daily sq".

Soundsplinter rl-p - sql

recommended sealed box size: .9-2cuft, , 1.35 recc

Qts: 0.207

Qes: 0.226

Qms: 2.470

Fs: 23.43 Hz

Re: 3.7 Ohm

Ls: 4.060 mH

Rp: 7.478

Vas: 87.73 L

Mms: 177.9 g

Cms: 259.2 u

Bl: 20.70 T*m

SPL: 88.81 dB

Sd: 0.0471 m^2

Xmax: 24.2 mm

IA Flatlyne - underhung sq

recommended box size .8 to 1.4 sealed

FS 28 Hz

Qms 3.88

Qes .55

Qts .43

Mms 224 g

Cms 0.14 mm/N

Sd 480 cm^2

Vas 36.9 L

Spl 83.7 db

BL 14.6

X-max 18 mm

Sub Diameter 12 3/8 inches

Mounting 11 1/8 inches

Mounting Depth 6 3/4 inches

Driver Displacement .13 cubic ft.

Im trying to understand the differences in these two subs. Going into the comparison, I expected the flatlyne to be hands down a better sub in all areas, but they seem almost like apples/oranges..do I have the following correct??

FS: The rl-p plays better at lower frequencies but the flatlyne plays better at more common frequencies?

Xmax: the rl-p moves a lot more to achieve its goal or does this mean it utilizes its frequency range better? Or do I throw this spec out the window since its harder for an underhung to get the same xmax?

BL: The flatlyne doesnt require as much motor strength to achieve its goal?

SPL: The rlp is a more sensitive sub???

Conclusion: Given the same power/enclosure, the rlp gets louder at lower frequencies, yet at the same time the flatlyne is more efficient due to flat bl?? That seems like an oxymoron.

What am I missing, can anyone add any input as to the performance difference of these two subs?

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[mlstrass 5,000+ posts]

Ran RL-P's in the car for about a year and use them in the HT now. Ran them sealed and in a few diff ported enclosures. I'm not a real SQ guy, so I found the bass to be kind of dry and wanted more output. Sub was very articulate sounding and played well down low and upper bass freqs also.

No experience with the flatlyne but if SPL was measured the same for both then it will be a LOT quieter. That might not be a concern in your install, but I like some impact from my sub(s)

 

[Why So Cereal? 5,000+ posts]

Who said the Flatlyne was the best SQ sub available?

 

[ds0110 10+ year member]

Ran RL-P's in the car for about a year and use them in the HT now. Ran them sealed and in a few diff ported enclosures. I'm not a real SQ guy, so I found the bass to be kind of dry and wanted more output. Sub was very articulate sounding and played well down low and upper bass freqs also.
No experience with the flatlyne but if SPL was measured the same for both then it will be a LOT quieter. That might not be a concern in your install, but I like some impact from my sub(s)

I think the flatlyne would be even more what youre talking about than the rlp. I dont see quiet being an issue though, as ill be pushing 750+ watts to it. Did the rlps perform much better in the sealed enclosure?

Who said the Flatlyne was the best SQ sub available?

-http://www.caraudio.com/forums/subwoofers/409339-ia-flatlyne-reviews.html#post6219732

Thats probably the best endorsement ive seen on this forum. They do very well in sq competition, albeit IB, when im going to be running sealed, but still...

-Most of the people that have these flatlynes switched from one of the other top SQ subs. Ive seen quite a few switch from idq, idmax, fi q, jl w7, dayton ho, etc, and they all seemed very happy. The only complaints I see are from people not liking the company itself or the people that run it.

-Nothing but rave reviews from people that see them at CES, some of whom work at other respected companies.

That is one drawback on the FL though, as it takes a certain amount of faith. There isnt nearly as much info as you would find on any of the other top sq subs, which is one big reason I had contemplating trading/selling this and trying to get the rl-p, which has tens if not hundreds of positive reviews on all forums.

 

[denim 5,000+ posts]

Both are great sub choices. The RL-p really is more at home in larger ported enclosures, tuned on the lower side. The FL is more at home sealed in medium sized enclosures and does not need much power. If your rough assessment, you have it pretty close. It is a thing of you choosing which driver really best suits your goals. The RL-p might be worth just grabbing to have one before they are a memory. If output is a strong goal, lean towards the RL-p, if not the FL is worth a go.