ibd2328

iTrader: (2)

I would def. go with the 8" if those two are your choices.

JoeBoost

ibd2328

iTrader: (2)

I just cant see how that 6.5" would hit the 50-80hz range appropriately. 6.5" is a are more approriate size for mid-drivers as they hit the frequencies where your subs slop off. (if set up correctly)

JoeBoost

Yeah my initial thoughts too - looked at the specs and its got decent numbers. Xmax .35, FS 41.8hz so in a properly tuned enclosure it should play pretty low. Not something I would choose as my primary sub given all the other options out there unless I was really hurting for space. 6 of these under the back seat firing forward might sound nice though

screw04

Back to the first op something else that will really help is XM radio. 10x as clear as the fm radio. When I put in my speakers I was happy but wanted XM so I got a new HU with the aux. plug in, bought a Sirius/XM unit and now she really thumps and is crystal clear just about to max power with the Sirius hooked up

ibd2328

iTrader: (2)

Not really sure if anyone will read this, but here goes.

I kind of got bored in my office earlier, so I did some simple calculations to help people see the difference in bass response and air movement of different subs and sizes. Please take into consideration these are general specs just to give everyone an idea of the differences: since bass is all about moving volumes of air.

Also note: Different boxes, ported, sealed, and size all plays into the scenario, but here are just a few general specs without taking the enclosure into account.

I used maplesoft to help me

#JL 6.5" woofer
#Cone Area For a 6.5 woofer with cutout diamater=5.875 and Xmaxx=.35inches
#Note: I used the cutout dia. for the diameter of the woofer
#Note: I approximated the cone depth by the Xmax(not a great approxmation but will work for us, unless otherwise specified). This will also keep consistancy for the computations.
#For later discussion we will use the V.C. length for the movement of the cone. (in reality should be about 3/4 of this)
r:=(5+(5/8))/2:
h:=.35:
V:=(1/3)*3.141592*(r^2)*h;
2.899223086

restart;
#Alpine R 8" woofer
#Cone Area For a 8" woofer with cutout diamater= 6 15/16 and Xmax(distance VC travels) approx 14mm=.55inches
#Note: I used the cutout dia. for the diameter of the woofer
#Note: I approximated the cone depth and movement by the Xmax = .55inches
r:=(6+(15/16))/2:
h:=.55:
V:=(1/3)*3.141592*(r^2)*h;
6.930063561

restart;
#Alpine R 10" woofer
#Cone Area For a 10" woofer with cutout diamater= 9 1/8 and Xmax(distance VC travels) approx 20mm=.787inches
#Note: I used the cutout dia. for the diameter of the woofer
#Note: I approximated the cone depth and movement by the Xmax = .787inches
r:=(9+(1/8))/2:
h:=.787:
V:=(1/3)*3.141592*(r^2)*h;
17.15572258

restart;
#Alpine R 10" woofer
#Cone Area For a 12" woofer with cutout diamater= 10 13/16 and Xmax(distance VC travels) approx 20mm=.787inches
#Note: I used the cutout dia. for the diameter of the woofer
#Note: I approximated the cone depth and movement by the Xmax = .787inches
r:=(10+(13/16))/2:
h:=.787:
V:=(1/3)*3.141592*(r^2)*h;
24.08770975
Hope everyone sees the huge difference in Surface area from the 6.5 compared to large subs.


#We could also use some partial differential equations to approximate the movement of air produced by each:

ClaySlayer

Just because the specs say the speaker can hit the low notes doesn't mean it can cleanly...especially when the volume is turned up. I'd vote for at least an 8"...and would highly recommend a 10" in a sealed enclosure for good quality (tight) bass. 10s are so much more common the price difference will be negligible.

ibd2328

iTrader: (2)

Generally, the"high end" named brands such as Focal, Morel, Hybrid, Audison, Rainbow, etc. rate their specs very conservatively. Most distortion comes from playing out of a speakers frequency range or too little or too less power. Almost all speakers can play their rated bandwidth and freq. settings if powered and crossed properly.

The frequencies a sub hits(~30-100) isn't hard to replicate for designed drivers. It's mainly setting the Filters and crossovers(24db/octave preferably) properly on the amp.

I def. agree Clay Slayer about the sealed enclosure, you will find that it produces must tighter quick response bass.

My experiment was to explain how drivers differ, and the large discrepancy in air displacement with incremental woofer sizes.

JoeBoost

^^^ Very true. Large woofers in a properly sized enclosure and with appropriate power can deliver tight responsive bass all day long.

The HAT L6V1's Im running are rated at 50hz w/24db slope @ 175w pmax. I am putting 300w into each speaker (crossed @ 60hz w/24db slope) and they just love the power. The increase in power added allot of control across the bands and improved ability to handle the dynamics when called upon (often given my playing habits & musical tastes). Sort of proves the point about conservatism that ibd mentions. I probably wouldn't overpower a lesser quality driver by that factor - YMMV.

There really is no replacement for cone area and IMO the more the better I like to fit the largest driver(s) possible in the available space.

ibd2328

iTrader: (2)

I would love to hear those 6L Hybrids, I had a set of the L4SE's in my BMW and WOWWW. I prefer their tweeters over Focals too(unless you have the Be. Utopias), those L4se's blew away my old Focal Polyglass comps in all areas of freq. response. They sounded truly amazing. The legatia tweeters are no joke.

I have always wanted to try a set of the Rainbow Germanium's but never went through with the purchase.