Experiment- RE SR10s in small ported box, polyfill, and precision ports.

[madmaxz 10+ year member]

Im getting ready to put together my subs and enclosure. i have 2 sr10d2's i currently have them in .5 each sealed and want to try ported (they actually sound really good sealed and get pretty **** loud way louder then my previous pioneer shallow mounts.) But i cant help myself.. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif i have a f250 crewcab so space behind the seat is tight. but enclosure im gonna try ported is .70 per side(freebie). im going to be adding 1lb of polyfill to the box glued to the corners and sides. i figure if i tune the enclosure without the polyfill to .70 @ 40-42hz after the poly fill i should have a projected tune of .95-1.05 @ 30-35hz. i have 3" precision ports with an overall length of 18" and Effective length of 17" using precision ports port length calculator on there website ive come up with a few numbers

>> Projection w 1lb of polyfill

.70 @ 42hz - 14.23" total length > 1.0+/-ft^3 @ 33-35hz - 14" Total Length precision port

.70 @ 40hz - 15.81" TL > 1.0+/-ft^3 @ 30-33hz - 16" TL PP

.70 @ 38hz - 17.65" TL > 1.0+/-ft^3 @ 28-30hz - 18" TL PP

ive used this article to come to these conclusions. ( Ultimate Polyfill Subwoofer Enclosure Resource [audiojunkies] )

and this port calculator Welcome to Precision Sound Products!

could it work?//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif Basicly im asking, what length port should i go with? 14/16/18?

SR SERIES

Enclosure Recommendations

10"

Sealed: Compact - .35 Optimal-.5

Ported: Compact - .65@35hz Optimal- 1.0@35hz (i modeled this in winisd and at 35hz it has a high peak at 35hz the model flattened way out tuned at 28hz)

Mounting Depth - 5.25"

Mounting Hole Diameter - 9.25"

Overall Diameter - 10.25"

Bolt Hole Circle - 9.625"

Motor Width - 6.25"

Motor Depth - 2.5"

Basket Depth - 2.75"

Displacement - 0.12 cu. ft.

Weight - 14.5 lbs.

Electrical Q Value -Qes: 0.39

Mechanical Q Value -Qms: 5.5

Total Speaker Q Value -Qts: 0.36

Free Air Resonance -Fs: 25.3 Hz

Equivalent Compliance -Vas: 31 liters

One-Way, Linear Excursion -Xmax: 18 mm

Efficiency -SPL 1W/1m: 85.3 dB SPL

Effective Piston Area -Sd: 310 cm^2

DC Resistance -Re: 1.8 ohm

Nominal Impedance -Znom: Dual 2/4 ohm

Thermal Power Handling -Pe: 300 W

Force Factor -Bl: 14.35

also Image dynamics 10" IDQ v3 and v2 call for 1.0ft^3 ported with 3"x12"L @34hz for the v3 and 3"x15"30hz for the v2. i say the sr10 and idq's are comparable. for enclosure setup anyway.

Click to read more...

 

[madmaxz 10+ year member]

looks like my initial math might have been a litttle optimistic

some new number i threw together

.56 with port and driver

+.1 = .66

+.2 = .76

+.3 = .86

+.4 = .96

+.5 = 1.06

+.6 = 1.16

+25% = .70

+30% = .728 @ 36.9hz = 18.02" PP

+35% = .756 @ 36.4hz = 18.03" PP

+40% = .784 @ 35.6hz = 17.98" PP

+45% = .812 @ 35hz = 17.96" PP

.70 @ 37.6hz = 18" PP

.75 @ 36.3hz = 18" PP

.80 @ 35.2hz = 18" PP

.85 @ 34.1hz = 18" PP

.90 @ 33.2hz = 18" PP

.95 @ 32.3hz = 18" PP

1.0 @ 31.5hz = 18" PP

1.05 @ 30.7hz = 18" PP

1.1 @ 30.0hz = 18" PP

.70 gross at 40% increase = .98ft^3

.64 net with port at 40% increase = .894ft^3

.56 net with port and driver at 40% increase = .784ft^3

so i should fall somewhere between .75 @ 36.3hz = 18" PP and .90 @ 33.2hz = 18" PP with 1lb of polyfill

 

[madmaxz 10+ year member]

welp got the precision ports today and there too big to fit in the box.. but i did however throw the sr10s in sealed and let me tell you what they sound better all the way around. louder.. better..i did have to bump the gain up on my amp (rockford t5002 bridged at 1000watts) but i thought they soinded good in .5.. building larger a custom box now anouy 1 cube each to try ported.

now the question is 2 10's ported or 2 12" sealed. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[madmaxz 10+ year member]

well i went out and found some 3" pvc drain pipe the thin stuff its about 1/16" thick unlike the thicker regular pvc. had to buy 10' but oh well it was only $9 for 10ft. cut 2 holes at the top of the sides of a universal truck style 49"w 13"t 4.25" top depth and 7" bottom depth with a round cut out where the magnet would hit patched over with 1/4" plywood coverd with carpet on the outside. and covered with diy rino liner stuff on the inside. The ports are 18" long 1 on each side. i stuffed .5lb of acusta stuf (polyfill) per side. glued it to the inside of the box with 3m spray adhesive. and the results are.. WOW i cant believe i even thought about keeping them sealed... the difference is crazy! loud low sounds better, hits harder, clearer.. cant hear any port noise (in the front seat anyways) im happy now. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

2 sr10d2's w/ 1000watts (had amp - rockford t5002) total - $150

1 truck box .70ea side. - $50

.5lb acusta stuff(polyfill from parts express) - $10

3"x18" ports (should be tuned to low 30hz range) - $9

still might buy some IDQ10v3s and build my own custom box and do it right with the precision ports. this was just a test and tune session.. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

given everything is setup right (box size and port) the idqv3's should get louder with even better SQ correct?

 

[Ellsworthz 10+ year member]

lots of comments on this lol.

posts look good, glad you like it.

 

[madmaxz 10+ year member]

yeah its deffinetly good enough for now.. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif its hard to get the output and SQ i want with the space available..

think im gonna try some 12's next if i can build a box with 1ft^3 each side and stuff the hell outa that..i think i can build one big enough and get the clearance i need to fit a 2 12's with 5.75" mounting depth like the sr12 or idq12