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You need more port area per foot. At least 12-16. I'd say more port area too. I know zv4 12 requires just over 40in^2 of port. Not sure with the x12, but I'm sure it's more than 29. Also 3.2cu may be a little too big for an x. I'm running my zv4 at 3cu.

2000 Chevrolet Tahoe Limited (Mine)HEAD UNIT: Pioneer AVH-X5500BHSBASS DRIVER: Sundown Audio [email protected] dailySUBWOOFER: (4) Sundown Audio Zv4 18d1BOX: under constructionMID/HI DRIVER(s): JBL PX300.4, Powerbass ASA600.4, Audiopipe 6002, American Bass SQ50FRONT DECK: Pioneer TS Pro 6.5, Power Acoustic nb-1, (4) American Bass SQ4.0 KICK PANEL: Kicker KS65 components REAR DECK: Powerbass XL Pro 6.5, Pioneer TS Pro 8's, Power Acoustic nb-2, Powerbass s412 4x10, (2) Crescendo pwx 10"ELECTRICAL: Big 3, all KNU & AP OFC 0awg on 240amp Mechman Alt, Audiopipe batt meter, (2) Scorpin batt metersBATTERIES: (3) XS Power 3400's, KInetic HC1800, Kinetic HC2000MISC: Fat Mat on all doors, Old setup: (4) SA15d4's on an NS1 151.0 on TL sealed 2010 Honda Civic LX (Wife's) 142.1 TL sealed trunkHEAD UNIT: Pioneer AVH-X7500BHS with Massive Audio EQ7BASS DRIVER: (2) Powerbass ASA1500.1d's(strapped) 3240w clamped @ 10.8v lol(stock alt)SUBWOOFERS: (1) Sundown Audio Zv4 12d2BOX: Custom built by me 3ft^3 @ 35hzMID/HI DRIVER: Powerbass ASA600.4FRONT DOORS: Alpine Sps610cREAR DOORS: Alpine Sps610cELECTRICAL: All Audiopipe 0awg, Big 3, Stinger batt meter, stock 90amp alt<p>BATTERIES: (2) Kinetic HC1400's, XS Power XP950

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Oh and the displacement is not .3 lol. It's more like .10-.12ish.

2000 Chevrolet Tahoe Limited (Mine)HEAD UNIT: Pioneer AVH-X5500BHSBASS DRIVER: Sundown Audio [email protected] dailySUBWOOFER: (4) Sundown Audio Zv4 18d1BOX: under constructionMID/HI DRIVER(s): JBL PX300.4, Powerbass ASA600.4, Audiopipe 6002, American Bass SQ50FRONT DECK: Pioneer TS Pro 6.5, Power Acoustic nb-1, (4) American Bass SQ4.0 KICK PANEL: Kicker KS65 components REAR DECK: Powerbass XL Pro 6.5, Pioneer TS Pro 8's, Power Acoustic nb-2, Powerbass s412 4x10, (2) Crescendo pwx 10"ELECTRICAL: Big 3, all KNU & AP OFC 0awg on 240amp Mechman Alt, Audiopipe batt meter, (2) Scorpin batt metersBATTERIES: (3) XS Power 3400's, KInetic HC1800, Kinetic HC2000MISC: Fat Mat on all doors, Old setup: (4) SA15d4's on an NS1 151.0 on TL sealed 2010 Honda Civic LX (Wife's) 142.1 TL sealed trunkHEAD UNIT: Pioneer AVH-X7500BHS with Massive Audio EQ7BASS DRIVER: (2) Powerbass ASA1500.1d's(strapped) 3240w clamped @ 10.8v lol(stock alt)SUBWOOFERS: (1) Sundown Audio Zv4 12d2BOX: Custom built by me 3ft^3 @ 35hzMID/HI DRIVER: Powerbass ASA600.4FRONT DOORS: Alpine Sps610cREAR DOORS: Alpine Sps610cELECTRICAL: All Audiopipe 0awg, Big 3, Stinger batt meter, stock 90amp alt<p>BATTERIES: (2) Kinetic HC1400's, XS Power XP950

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You need more port area per foot. At least 12-16. I'd say more port area too. I know zv4 12 requires just over 40in^2 of port. Not sure with the x12, but I'm sure it's more than 29. Also 3.2cu may be a little too big for an x. I'm running my zv4 at 3cu.

this is exactly what i was concerned with, i couldn't find a figure for the x series yet.

Oh and the displacement is not .3 lol. It's more like .10-.12ish.

giggle, gotta love being told numbers from people that "sell" the product then

round two......

10247125944_93109698e7_b.jpg

Edited by jimmydamoose
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I'd do a 3" wide port, get that port area up into the 40s. Extend the port to around 28-32" long(depending on where you want tuning) and for God's sake, double baffle the thing.

Side note. I doubt the displacement is only .10-.12 cubes. My RE SRx was a cheap, stamped basket and displaced .14. That sub only had a mounting depth of 6.5". The Sundown X12 is easily 2"(probably more)deeper, plus the basket is bulky and cast and the motor is deep and wide as well. I'd guess at least .24 cubed for one X12. But .30 is definitely not out of the question, it could easily displace that much volume.

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Im not the one you want to try to troll. Just a fyi for you.

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My Zv4 18 displacement is .15....that's a spec sheet straight from Brian at Sundown. I know, I thought the same thing, very small. The dis on a zv3 18 is .16, so might want to check up on that.

2000 Chevrolet Tahoe Limited (Mine)HEAD UNIT: Pioneer AVH-X5500BHSBASS DRIVER: Sundown Audio [email protected] dailySUBWOOFER: (4) Sundown Audio Zv4 18d1BOX: under constructionMID/HI DRIVER(s): JBL PX300.4, Powerbass ASA600.4, Audiopipe 6002, American Bass SQ50FRONT DECK: Pioneer TS Pro 6.5, Power Acoustic nb-1, (4) American Bass SQ4.0 KICK PANEL: Kicker KS65 components REAR DECK: Powerbass XL Pro 6.5, Pioneer TS Pro 8's, Power Acoustic nb-2, Powerbass s412 4x10, (2) Crescendo pwx 10"ELECTRICAL: Big 3, all KNU & AP OFC 0awg on 240amp Mechman Alt, Audiopipe batt meter, (2) Scorpin batt metersBATTERIES: (3) XS Power 3400's, KInetic HC1800, Kinetic HC2000MISC: Fat Mat on all doors, Old setup: (4) SA15d4's on an NS1 151.0 on TL sealed 2010 Honda Civic LX (Wife's) 142.1 TL sealed trunkHEAD UNIT: Pioneer AVH-X7500BHS with Massive Audio EQ7BASS DRIVER: (2) Powerbass ASA1500.1d's(strapped) 3240w clamped @ 10.8v lol(stock alt)SUBWOOFERS: (1) Sundown Audio Zv4 12d2BOX: Custom built by me 3ft^3 @ 35hzMID/HI DRIVER: Powerbass ASA600.4FRONT DOORS: Alpine Sps610cREAR DOORS: Alpine Sps610cELECTRICAL: All Audiopipe 0awg, Big 3, Stinger batt meter, stock 90amp alt<p>BATTERIES: (2) Kinetic HC1400's, XS Power XP950

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PER WOOFER 6cuft after displacement. port area 84sqin tuned to 30hz for max performance. woofer displacement is 0.15cuft attached is a measurement diagram.

*Thank You*

Bryan Chamberlain

Sundown Audio

Public Liason/Tech support

This is for the zv4 18

2000 Chevrolet Tahoe Limited (Mine)HEAD UNIT: Pioneer AVH-X5500BHSBASS DRIVER: Sundown Audio [email protected] dailySUBWOOFER: (4) Sundown Audio Zv4 18d1BOX: under constructionMID/HI DRIVER(s): JBL PX300.4, Powerbass ASA600.4, Audiopipe 6002, American Bass SQ50FRONT DECK: Pioneer TS Pro 6.5, Power Acoustic nb-1, (4) American Bass SQ4.0 KICK PANEL: Kicker KS65 components REAR DECK: Powerbass XL Pro 6.5, Pioneer TS Pro 8's, Power Acoustic nb-2, Powerbass s412 4x10, (2) Crescendo pwx 10"ELECTRICAL: Big 3, all KNU & AP OFC 0awg on 240amp Mechman Alt, Audiopipe batt meter, (2) Scorpin batt metersBATTERIES: (3) XS Power 3400's, KInetic HC1800, Kinetic HC2000MISC: Fat Mat on all doors, Old setup: (4) SA15d4's on an NS1 151.0 on TL sealed 2010 Honda Civic LX (Wife's) 142.1 TL sealed trunkHEAD UNIT: Pioneer AVH-X7500BHS with Massive Audio EQ7BASS DRIVER: (2) Powerbass ASA1500.1d's(strapped) 3240w clamped @ 10.8v lol(stock alt)SUBWOOFERS: (1) Sundown Audio Zv4 12d2BOX: Custom built by me 3ft^3 @ 35hzMID/HI DRIVER: Powerbass ASA600.4FRONT DOORS: Alpine Sps610cREAR DOORS: Alpine Sps610cELECTRICAL: All Audiopipe 0awg, Big 3, Stinger batt meter, stock 90amp alt<p>BATTERIES: (2) Kinetic HC1400's, XS Power XP950

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Zv4 and X series are the same basket..

2000 Chevrolet Tahoe Limited (Mine)HEAD UNIT: Pioneer AVH-X5500BHSBASS DRIVER: Sundown Audio [email protected] dailySUBWOOFER: (4) Sundown Audio Zv4 18d1BOX: under constructionMID/HI DRIVER(s): JBL PX300.4, Powerbass ASA600.4, Audiopipe 6002, American Bass SQ50FRONT DECK: Pioneer TS Pro 6.5, Power Acoustic nb-1, (4) American Bass SQ4.0 KICK PANEL: Kicker KS65 components REAR DECK: Powerbass XL Pro 6.5, Pioneer TS Pro 8's, Power Acoustic nb-2, Powerbass s412 4x10, (2) Crescendo pwx 10"ELECTRICAL: Big 3, all KNU & AP OFC 0awg on 240amp Mechman Alt, Audiopipe batt meter, (2) Scorpin batt metersBATTERIES: (3) XS Power 3400's, KInetic HC1800, Kinetic HC2000MISC: Fat Mat on all doors, Old setup: (4) SA15d4's on an NS1 151.0 on TL sealed 2010 Honda Civic LX (Wife's) 142.1 TL sealed trunkHEAD UNIT: Pioneer AVH-X7500BHS with Massive Audio EQ7BASS DRIVER: (2) Powerbass ASA1500.1d's(strapped) 3240w clamped @ 10.8v lol(stock alt)SUBWOOFERS: (1) Sundown Audio Zv4 12d2BOX: Custom built by me 3ft^3 @ 35hzMID/HI DRIVER: Powerbass ASA600.4FRONT DOORS: Alpine Sps610cREAR DOORS: Alpine Sps610cELECTRICAL: All Audiopipe 0awg, Big 3, Stinger batt meter, stock 90amp alt<p>BATTERIES: (2) Kinetic HC1400's, XS Power XP950

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