3 day shipping to Continental USunless additional handling About UsPolicies & SupportVisit our storeOffice Hours:Mon-Fri: 8:30AM-9:00PM CST | Sat-Sun: 10:00AM-7:00PM CST 3 day shipping to Continental US*unless additional handlingStore CategoriesAll CategoriesCar Audio+- Amplifiers- Amp & Sub Combos- Car Audio Packages- Amp & Speakers Combo- Empty Sub Boxes- Factory Radio- In-Dash Receivers- Motorcycle Speakers- Signal Processors- Snowmobile Speakers- Speakers- Subwoofers- UTV Side by Side Speakers- Kick Panels- Car Speaker PackagesCar Audio Accessories+- 12 Volt Power Supplies- Amp Kits- Antennas- Bass Blockers- Batteries- Battery isolator- Capacitors- Cooling Fans- Dash Kits- Distribution Blocks- Fuse Holders- Fuses- Installation Adapters- Installation Harness- Installation Interfaces- Interconnects- iPod Solutions- Neon Lighting- OEM Harness- Signal Path Devices- Sound Damping- Speaker Box Fabric- Subwoofer Grills- Terminals- Wire Harnesses- Wiring- Security Installation- Zune Solutions- Wall Mount Brackets- OtherHome Theater+- In Wall Speakers- In Ceiling Speakers- Outdoor Speakers- Receivers- OtherHome Theater Accessories+- Interconnects- Structured Wiring- Wall Plates- Cables- Power Supplies- Headphones- MP3 Player Accessories- Speakers- Subwoofers- OtherMarine Audio+- Accessories / Remotes- Jetski Speakers- Marine Amplifiers- Marine CD Players- Marine Speakers- Marine Subs- OtherMobile Video+- Custom Fit Headrest Monitors- DVD Players- In-Dash LCD Monitors- License Plate Cameras- Overhead Monitors- Rearview Mirror Monitors- Sun Visor Monitors- Video Installation Parts- Parts & AccessoriesMusical Instruments+- Instrument Cases- Electric Guitars- Acoustic Guitars- Bass Guitars- Percussion- Parts & Accessories- Other Instruments- Instrument AmplifiersPro Audio+- Amplifiers- Audio Signal Processing- Cases & Bags- DJ Equipment- Music Production- PA Speakers- Power Conditioning- Recording Equipment- Sound Systems- Wired Microphones- Wireless Microphones- DJ Packages- Parts & Accessories- MixersPro Lighting+- Area Effects- Cables- DMX Controllers- Lighting- Mounting Hardware Cases Bags- Parts & Accessories- Lighting PackagesOthersShow all subcategoriesCustom Gmc Sierra Ex Cab 88-98 Truck Dual 12 Subwoofer Enclosure Sub Speaker Box SpecificationsDescriptionQuestions & AnswersCustom Gmc Sierra Ex Cab 88-98 Truck Dual 12 Subwoofer Enclosure Sub Speaker Box SKU:2X12GMOLD_2Features:Dual 12" 88-98 Chevy Extended Cab Sub BoxAir Space: 0.95 Cubic FeetMounting Depth: 5"Sealed EnclosureDimensions: Width 56-3/4" x Front Height 10" x Rear Height 6-1/4" x Depth 13-1/4"Constructed with High Quality MDFHigh Quality Binding Terminal Cup (Accepts Banana Terminal Plugs OR Bare Wire 'up to 10GA')High Quality Black Carpet Enclosure installs under rear seat down firingThis box fits:1988 - 1998 Chevy C/K Extended Cab1988 - 1998 GMC Sierra Extended CabCustom Gmc Sierra Ex Cab 88-98 Truck Dual 12 Subwoofer Enclosure Sub Speaker Box Adding bass to a truck can be a very complicated problem to tackle, especially when building a box! We offer pre-built enclosures that are ready to be dropped into your 88-98 Chevy CK / GMC Sierra truck that offer unbeatable performance and sound quality that simply cannot be matched. This is a dual 12" down firing model, why down firing? This style enclosure actually increase the SPL output of your subwoofers forcing the sound waves to travel up in down inside the cab before reaching the listener. The woofers are spaced off the floor so it's not possible for them to hit the floor while playing. It also keeps the subs out of view for security concerns. Overall you cannot find a better fitting or sound box at this price! ?á Our boxes are made from precision cuts of MDF. They are then liquid nailed, nailed and completely sealed. We then wrap them with high quality carpet that matches most vehicle interiors. All Boxes feature high grade spring loaded terminal cup(s) for the absolute best connection possible. All the custom series enclosures are made to fit precisely into your GMC Sierra 88-98 Extended Cab to the get the max performance from every extra inch of wasted space. We guarantee you will not only see a difference in the quality of the boxes we build, but you will hear the difference and that is what is it is truly all about. Frequently Asked Questions for this Product:How fast do you ship out?Most orders placed before 3:00 PM CST will ship within 24 hours. If you need a product by a specific time please contact us before ordering.When will I receive my tracking number?Most tracking numbers are sent out around 5:30 PM CST of the following business day. Please allow 24-business-hours after ordering before requesting tracking information.How fast will I receive my product?Depending on your location it may take 3-4 business days for your order to arrive. Your tracking number will tell you the exact day your order will arrive. If you need an order by a specific date we recommend you to call us.SpecificationsCustom Gmc Sierra Ex Cab 88-98 Truck Dual 12 Subwoofer Enclosure Sub Speaker Box SKU:2X12GMOLD_2Features:Dual 12" 88-98 Chevy Extended Cab Sub BoxAir Space: 0.95 Cubic FeetMounting Depth: 5"Sealed EnclosureDimensions: Width 56-3/4" x Front Height 10" x Rear Height 6-1/4" x Depth 13-1/4"Constructed with High Quality MDFHigh Quality Binding Terminal Cup (Accepts Banana Terminal Plugs OR Bare Wire 'up to 10GA')High Quality Black Carpet Enclosure installs under rear seat down firingThis box fits:1988 - 1998 Chevy C/K Extended Cab1988 - 1998 GMC Sierra Extended CabDescriptionCustom Gmc Sierra Ex Cab 88-98 Truck Dual 12 Subwoofer Enclosure Sub Speaker Box Adding bass to a truck can be a very complicated problem to tackle, especially when building a box! We offer pre-built enclosures that are ready to be dropped into your 88-98 Chevy CK / GMC Sierra truck that offer unbeatable performance and sound quality that simply cannot be matched. This is a dual 12" down firing model, why down firing? This style enclosure actually increase the SPL output of your subwoofers forcing the sound waves to travel up in down inside the cab before reaching the listener. The woofers are spaced off the floor so it's not possible for them to hit the floor while playing. It also keeps the subs out of view for security concerns. Overall you cannot find a better fitting or sound box at this price! ?á Our boxes are made from precision cuts of MDF. They are then liquid nailed, nailed and completely sealed. We then wrap them with high quality carpet that matches most vehicle interiors. All Boxes feature high grade spring loaded terminal cup(s) for the absolute best connection possible. All the custom series enclosures are made to fit precisely into your GMC Sierra 88-98 Extended Cab to the get the max performance from every extra inch of wasted space. We guarantee you will not only see a difference in the quality of the boxes we build, but you will hear the difference and that is what is it is truly all about. Questions & AnswersFrequently Asked Questions for this Product:How fast do you ship out?Most orders placed before 3:00 PM CST will ship within 24 hours. If you need a product by a specific time please contact us at 1-877-275-4434 before ordering.When will I receive my tracking number?Most tracking numbers are sent out around 5:30 PM CST of the following business day. Please allow 24-business-hours after ordering before requesting tracking information.How fast will I receive my product?Depending on your location it may take 3-4 business days for your order to arrive. Your tracking number will tell you the exact day your order will arrive. If you need an order by a specific date we recommend you call us at 1-877-275-4434Shipping PolicyAlthough many orders are shipped the same day that we receive them, due to a variety of factors it can take up to 24 hours to process your credit card information and ship your order. FedEx picks up shipments daily, Monday through Friday around 4:00 PM (Eastern Time). They DO NOT operate on weekends or holidays. If you place an order for shipping on Friday night, the next available shipping day is Monday.Transit time depends on where you are located and which warehouse we ship your order from.Estimated Transit TimesIMPORTANT INFORMATION on expedited shipments such as Next Day Air, Second Day Air and 3- Day Select:1.) The pickup day is not counted as a transit day.2.) Weekend and holidays are not counted as transit days.Example: If you place an order Friday evening for 3-Day Select shipment and the following Tuesday happens to be a holiday, your order will be processed for Monday shipment. Since Tuesday is a holiday, the first transit day is Wednesday, the second transit day is Thursday and the final transit (and delivery) day is Friday. It is important to understand this scenario for all expedited shipment methods.To avoid delay in the processing of your order, please be sure to provide us with accurate credit card information (name as it appears on the card, billing phone number and address). If this information does not match exactly with what the credit card company has on file for you, you will need to be contacted for the correct information. Contact is normally to the email address that you have provided on your order form. If this information is not correct or you don't check your mail regularly, you may miss important correspondence from us regarding your order.HiFiSoundConnectionships via FedEx and USPS depending on the item. Larger items and heavier orders will ship via FedEx services. Smaller items such as harnesses, fuses etc will ship via USPS service. Although our shopping cart calculates shipping via FedEx, we sometimes will ship via FedEx, DHL or another similar carrier. Each carrier has it's areas where service is better than another and we try to select the best service to get your order delivered in the most timely manner. In instances we use FedEx or another carrier, the shipping charges will be exactly as calculated on our shopping cart. We ship to both the US and Canada and we can ship internationally but PLEASE be sure to contact us first before placing an international order. Note: For any orders shipping internationally you are responsible for any and all custom duty fees and taxes. Most items shipped via FedEx ground will arrive within 2 to 7 days depending on your location in the US and 7 to 14 days within Canada.Free shippingon items only applies to orders shipping to the Continental United States. If you live outside the Continental United States you will have to pay for the normal shipping charges to your location.Customer Service We are here to help! Our customer service staff will be glad to assist you with any questions or concerns you may have. We have a service member available 5 days a week to answer your questions.You can call us from Monday through Friday from 8:30AM - 9:00PM Central Standard Time or Saturday through Sunday from 10:00AM to 7:00PM Central Standard Time. You can also email us and one of our friendly staff will get back to you usually within one to two hours. All emails are answered in the order they are received and we do answer them all. Include your invoice # and email address with all emails. Please make sure to check your junk mail filter for replies. Sometimes email programs will accidentally place our emails in your junk mail folder.Return PolicyWithin 14 days of receiving your product you may return certain items in their original condition and packaging for a refund.We are not responsible for any shipping and/or handling charges to return an item to HiFiSoundConnection. We will pay the shipping of replacements back to your location.Your refund will be subject to a 20% restocking fee with a $10.00 minimum fee.If exchanging you will NOT be subject to the 20% restocking fee. You WILL have to pay the return shipping costs.We doNOTrefund the amount you paid for shipping, duties, taxes, or any other charge incurred getting the item to your location.We reserve the right to charge a 35.00 flat fee on warranty / exchanges if the original product packaging is not included.Other fees associated with items not included with the returned merchandise such as bass knobs, fuse holders, manuals, etc that were not included with the package are also subject to additional fees depending on the item not returned.All returns require an RMA (return merchandise authorization) number. Any packages sent back without an RMA number will be delayed and possibly rejected. Please contact us to obtain an RMA number.All returns will be tested before any refund is given.All International Sales are final, the return/exchange policy does not apply to International ordersThe return policy does not cover damage due to improper installation, if an item was physically altered by you, or services performed by anyone other than HiFiSoundConnection.Within 30 days of receiving your product, if it becomes defective you can claim our in-house HiFiSoundConnection warranty, unless otherwise stated on the product page.We are not responsible for any shipping and / or handling charges to return a defective item to HiFiSoundConnection.We will pay for the shipping on the replacement product going back to your location.We reserve the right to refer you to the manufacturer for any warranty exchanges.We reserve the right to switch you to a comparable product if the original product is out of stock or discontinued.We will not send your replacement item until we have received and checked in the defective product, this may take up to5 business days. All returns will be tested before any refund is given.Any item that is returned MUST first have RMA (return merchandise authorization) number before sending the package, if the package does not have an RMA number clearly on the outside of the return packaging it will be automatically refused. Please contact us to obtain an RMA number.Subwoofer Exception: Our warranty does not cover blown voice coils, or subwoofers that have been punctured. This is considered abuse by the manufacturer and is not covered under warranty.Defective items cannot be returned for a refund.All International Sales are final, the return/exchange policy does not apply to International ordersThe return policy does not cover damage due to improper installation, if an item was physically altered by you, or services performed by anyone other than HiFiSoundConnection.Warning: This product can expose you to the chemical Formaldehyde (gas), which is known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.Car Audio Packages - GMCCar Speaker Packages - GMCEmpty Sub Boxes - GMCCar Audio - AmplifiersCar Audio - SubwoofersCar Audio - SpeakersCar Audio - In-Dash ReceiversCar Audio - Signal ProcessorsCar Audio Accessories - Amp KitsCar Audio Accessories - CapacitorsCar Audio Accessories - BatteriesCar Audio Accessories - Car Audio AccessoriesCar Audio Accessories - Car Audio© 2001-2017 HiFi Sound Connection. All Rights Reserved.Home|About Us|Policies & Support