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Massive Audio 8" 800 Watt Subwoofer Dual 4 Ohm Shallow Mount SUMMO84S

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Massive Audio 8" 800 Watt Subwoofer Dual 4 Ohm Shallow Mount SUMMO84S

Maximize Bass Reproduction and save on airspace via this innovative new design! This new cast basket and sealed bottom plate design will replace traditional bottom venting by redirecting the cooling from the pole piece vent to the bottom of the customized basket. this allows the subwoofer to be installed where the depth is limited. By bolting this machine screw through the back of the enclosure to the backplate of the subwoofer you will minimize 'box flexing' and reduce the airspace needed in the box itself! Minimizing box flexing will increase efficiency by converting the wasted electrical power from the amplifier directly to the mechanical linear subwoofer cone's movement which will minimize distortion and add more efficient bass reproduction.

This Listing Includes:
(1) 8" Subwoofer SUMMO84S

- Shallow Mount Design via Sealed Backplate & Customized Vented Cast Basket
- Bolt-To-Box Machined Hex Screw-on Magnet Backplate for Maximized Bass via Reduced Box Flexing
- Optimized Spider & High Rolled Edge for Superior Bass Reproduction
- Kevlar Fiber Enhanced Non-Pressed Paper Cone
- 4-Layer Hi-Temp Voice Coil
- Fiberglass Woven Dust Cap
- Double Stacked 66oz High Energy Strontium Ferrite Magnets
- Enhanced Cooling T-yoke Design with Black Anodized Finish
- Customized Rubber Gasket and Magnet Boot
- 100% Pure Copper Cables with Direct Lead Connection
- Triple Black Poly Cotton Spiders with Mirror Image Layout

Size: 8"
Peak Watts: 800
RMS Watts: 400
Cone: Non-Pressed Paper
Voice Coil: Dual 4 Ohm
Surround: Red Stitching
Magnet: 66oz Double Stacked
Terminals: Heavy Duty Direct Input Wires Connection
Basket: Rugged Industrial Textured Cast
Tinsel Leads: Heavy Duty Triple
X-Max: 9mm
SPL: 86dB

Ported Box: 1.097 ft3
Sealed Box: 16.5" x 9.6" x 10.6"
Mounting Depth: 4.45"
Mounting Width: 7.32"
Overall Diameter: 8.66"


Coming Soon


Free shipping for customers with a valid residential or commercial address within the Contiguous 48 United States (PO Boxes address may require additional charges).

P.O. Boxes, APO/FPO addresses, Alaska, Hawaii, Puerto Rico, Guam, U.S. Virgin Islands, Northern Mariana Islands, American Samoa, Canada, and other countries may require additional shipping fees.
Please contact a member of our team for detailed shipping charges.

Shipping is available only to PayPal verified addresses. When making payment please confirm your address has been verified with PayPal. Once payment is made shipping address can not be changed/altered. Payments made using an unverified PayPal address will be refunded and order will be canceled.

We will not accept request to change shipping address once payment has been made. Please confirm your shipping address is up-to-date and valid.

Typical handling time for orders is 1-business day. We do our best to ship every package with-in 1 business day of receiving a cleared payment. In some circumstances additional time may be need, in which case we will contact buyer.

Shipped orders that are returned by the shipping company due to an insufficient address or an undeliverable address will be refunded less a 20% restocking fee.

Orders refused at time of delivery and returned back to Big Jeff Online will be refunded less a 20% restocking fee.

PR, VI, HI, AK and other Us territories may need additional shipping due to size and weight of package.


1. Please make sure to box up product in original boxes and all paperwork and parts

2. Please makes sure to put short note with reason for return and if you would like placement or refund Also include your contact information for us to look up your account.

3. Make sure items are shipped properly so they make it to us in good condition.

Once we receive return, we will process refund or replacement in 24 to 48 business hours.

Speakers with Burnt Coils or frozen up or physical damage will not be accepted

Amplifiers that have been smoked from improper use will not be accepted.

Big Jeff Online Inc
2640 NW 10th Street Unit A
Ocala, FL 34475


We accept returns within 30 days of purchase.

A 20% restocking fee applies on all items returned for a refund and or store credit.

If you receive a manufacture defective item and want to return or exchange it there is no restocking fee.

No refunds will be given on items that have been opened or used and will be exchange only.

Anything being returned must include all original parts and packaging sent.

(Boxes, Packing, Instructions, ETC) Everything we sent needs to come back

Serial numbers must match from order being returned on product and box.

Buyer is responsible for return shipping unless the item is defective.

No physical damage will be accepted!!!!


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