• Performance Level


    Dustcap Type

    Logo Type

    Logo Color

10% discount on 4-9
15% discount on 10+
Discount shown in shopping cart.

subwoofers are available directly on our website with ratings of 400 or 600 watts rms power handling.They are built with high quality 2″ dual voice coils(flatwound in the high performance version), stitched 3 mm interwoven leadwires, 10gauge direct connect leads, 8″ pulp cone with wide roll rubber surround, and rubber mounting gasket.

The versions offered on our website are designed to be used in daily systems where good sound quality and high outputis required. The PSI-8 offers excellent sound quality and can provide exceptional levels of output considering its small size.

PSI-8 subwoofers are also available to be custom built with power ratings from 250-750 watts rms in varying applications from sealed, to ported, infinite baffle, or bandpass in daily systems or for competition systems.

The PSI-8 is designed to use a choice parts selection that offers an incredibly strong, long throw design with exceptional power handling. Other 8″ subwoofers do not offer the same combination of stroke and power handling that the PSI-8 does.

In terms of output, reliability, and quality, these small subwoofers can be compared to subwoofers in a much higher price range. They offer top quality components, adhesives, and assembly. This series sells at roughly the same cost as many imported, low quality subwoofers with weaker, smaller internal parts. Do not be misled by the price; the PSI-8 series subwoofers offer outstanding performance at an extreme value. These are hand assembled at our shop in the USA.

Standard features include:
Dual stacked 6″ x 1″ Y35 ceramic slugs
Chrome top and bottom plates
FEA optimized motor assembly
6 spoke aluminum cast frame – Black
10ga CCA direct connect
Standard 4 layer aluminum roundwire voice coil
Dual 2 and Dual 4 ohm standard impedances
Dual 6.5″  linear roll poly-cotton spiders
Sewn 3mm heavy duty leadwire
Kevlar impregnated pulp cone body
1.1″ wide roll rubber surround
6″ polypropylene dome dustcap
PSI logo


Our subwoofers are available in two different performance configurations, Standard and High Performance. The High Performance option will modify the parts used to build the subwoofer to increase the overall power handling and output capability.

The following upgrades would be applied to the subwoofer if the High Performance option is selected:
Power handling increase from 400 watts to 600 watts RMS.
High Power aluminum flatwound voice coil
Stiffer, dual spider suspension

 T/S Parameters for PSI-8:
Revc = 3.00 ohms
Fs = 35.00 Hz
Zmax =
Qes = 1.10
Qms = 8.50
Qts = 1.00
Le = mH
Sd = 200 cm^2
Vas = .37 ft^3 / 10.50 L
BL = 10.5
Mms = g
Cms =
Sensitivity = 76.50 dB @1W/1m
Sensitivity = 79.10 dB @2.83Vrms/1m
Xmax = 48mm total
Usable excursion = 2″ total


Enclosure Recommendations:
Sealed – 0.25-1.0 ft^3 (0.5 ft^3 optimal)
Ported – 0.4-1.0 ft^3 (0.75 ft^3 optimal)

This product may also be used in Infinite Baffle and Bandpass applications. Please contact us before purchasing this product for these installations to make sure that the standard parts will be compatible with your enclosure.

If you would like to customize this series of subwoofer with performance or cosmetic options that are not available in our online store, please submit a
Custom Subwoofer Request.

Physical Specifications for PSI-8:
Rated Diameter  8″ / 200 mm
Overall Diameter 8.5″ / 216 mm
Bolt Hole Circle 8.267″ / 210 mm
Cutout Diameter 7.25″ / 184 mm
Mounting Depth 5.5″ / 140 mm
Magnet Diameter 6.3″ / 160 mm
Driver Displacement .06 ft.³ / 1.69 L
Shipping Weight 17 lbs. / 7.71 kg


PSI-8 dome PSI-8 dish PSI-8 cfdomePSI-8 cfdish 


Products manufactured by PSI are covered by a 1 year warranty.

• Our warranty covers all workmanship and materials on any defective items.
• Defective items will be repaired or replaced at the discretion of PSI Car Audio.
• Return freight costs shall be paid by the customer.
• The warranty does not cover burnt voice coils, customer abuse, improper installations, accidental damage, or any custom modifications.
• Any warranty repairs must the authorized via the Warranty Request Form.

custom subwoofers

If our standard or high-performance options don’t suit your installation needs, feel free to send us a custom subwoofer request. This form will allow you to submit all of your install specifics to us. You can also include any special requests for colors, custom logos, or other options.

Your email address? Please double check it for accuracy.

Your full name?

What is your phone number?

How many subwoofers do you need?

What size do they need to be?

How much power does EACH subwoofer need to handle? (RMS power)

What impedance will you need (Per voice coil)?

The brand AND model of amplifier you'll use with it?

The type of enclosure that it needs to work in? (Sealed, ported? Tuning Frequency?)

The type of music that you'll listen to with it?

Will you be competing with it, or is it a daily usage subwoofer?

Is it for competitions only?

Would you like any special colors? If so, where?

Upgrades of any sort? Direct leads, carbon fiber dustcap, etc?

What is your budget for these products?

Where are you located? ZIP CODE PLEASE

Do not use this form for recones for other brands of subwoofers.

If you have any photo examples to include with your submission, please upload them here.

Any other special instructions or requests?

Type those letters into this box. 🙂

Please double check your email address before sending the request. We get many requests from people who supply a misspelled email address from we cannot contact. If you do not supply the correct email address, we can't get in touch with you.

Please make sure that you add to your safe senders list.


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