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Polk Audio Signature Reference SR5250

5-1/4" component speaker system

Item # 107SR5250

Polk Audio has taken elements from their highly-acclaimed LSi Series home speakers and brought them to your car.

Find what Fits your vehicle

Polk Audio has taken elements from their highly-acclaimed LSi Series home speakers and brought them to your car.

Discontinued item

Item # 107SR5250

Since 1974

Years of experience making people happy.

Free lifetime tech support

Whenever you need a hand.

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We double check the details on each item.

About the Polk Audio Signature Reference SR5250

Ken Nail
Polk Audio has taken elements from their highly-acclaimed LSi Series home speakers and brought them to your car. The award-winning Signature Reference Series component speakers will impress you with sound that's detailed, dynamic, and realistic.

Polk Audio has taken elements from their highly-acclaimed LSi Series home speakers and brought them to your car. The award-winning Signature Reference Series component speakers will impress you with sound that's detailed, dynamic, and realistic.

The SR5250 5-1/4" component speaker system features special-design tweeters that broadcast accurate, natural high frequencies, with no annoying frequency spikes to color the sound. If installation space is limited, these versatile tweeters can even be mounted directly on the woofer cones to make outstanding 2-way speakers.

The air-injected polypropylene woofers kick out gutsy lows with superior control, and their extended frequency response allows them to blend smoothly with the tweeters. Butyl rubber surrounds form a rugged suspension for the cones, while the cast aluminum baskets eliminate resonances that can degrade sound quality. The powerful, compact neodymium magnets exert superb control over cone movement, while freeing up installation space.

High-performance crossover networks stabilize impedance as they distribute signals to the woofers and tweeters. The result — extremely accurate sound. Each crossover features four tweeter output levels — plenty of adjustment options to ensure well-balanced highs.

Priced per system


Product highlights:

  • component speaker system includes woofers, tweeters, and crossovers
  • 5-1/4" aerated polypropylene woofer with UV- and temperature-resistant butyl rubber surround
  • 7/8" ring radiator tweeter with multiple mounting options
  • die cast aluminum woofer basket
  • 2-way external Zobel crossover network (3100 Hz, 18 dB/octave high-pass and 12 dB/octave low-pass) with four tweeter level settings
  • power range: 50-100 watts RMS (200 watts peak power)
  • frequency response: 60-30,000 Hz
  • sensitivity: 90 dB
  • top-mount depth: 2-1/4"
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # AA5253-A

What's in the box:

  • Two 5-1/4" woofers (with installed phase plugs)
  • Two 22mm ring radiator tweeters (with attached 10" length of speaker wire)
  • 2 Tweeter flush mount cups (installed)
  • 2 Tweeter angle mount cups
  • 2 Crossover networks
  • 2 Coaxial tweeter posts
  • 2 Woofer grilles
  • 2 Woofer grille mounting rings
  • 2 Tweeter grilles
  • Two 5x7/6x8 Woofer adapter plates
  • 2 Adapter plate plugs
  • 2 Tweeter flush mount clamps
  • 2 Tweeter angle mount clamps
  • 2 Woofer mounting gaskets
  • 2 Rubber grommets
  • 2 Woofer spacer rings
  • 4 Speaker terminals
  • 4 Clear plastic speaker terminal insulators
  • Strip of grille adhesive
  • 8 Speed clips
  • Tweeter install tool
  • 2 Pan-head machine screws (#6 x 1/4")
  • 2 Split-ring lock washers (#6)
  • 4 Flat-head sheet metal screws (#8 x 1")
  • 8 Pan-head sheet metal screws (#8 x 1/2")
  • 8 Pan-head sheet metal screws (#8 x 3/4")
  • 8 Pan-head sheet metal screws (#8 x 1-1/2")
  • Owner's Manual (English/ Portuguese/ Italian/ German/ Spanish/ French)
  • Woofer mounting template
  • Tweeter mounting template
  • On-line product registration information
  • Letter of congratulations from Matthew Polk
  • Polk Audio vinyl decal

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More details on the Polk Audio Signature Reference SR5250

Pat M.

Features & specs

Speaker Size
Design 2-way
Tweeter Design 22mm Ring Radiator
Impedance (Ohms) 4
Tweeter Composition Fabric
Woofer Composition Aerated Polypropylene
Woofer Surround Butyl Rubber
Parts Warranty 3 Years
Labor Warranty 3 Years
Sensitivity (1W at 1 meter) 90
Sensitivity at 2.83 volts N/A
Frequency Response 60 - 30k Hz
Minimum RMS Wattage 50
Maximum RMS Wattage 100
Peak Power Handling (Watts) 200
Top-mount Depth (Inches) 2 1/4
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) 4 3/4
Mounting Height (Inches) 0.346

Product Research

Woofer Features
Tweeter Features
Crossover Features

Woofer Features

Aerated Polypropylene (APP) Cone: The Polk Audio SR5250's woofers are constructed of Aerated Polypropylene, a mineral-filled polypropylene that has been "puffed up" with injected air to form a honeycomb-like structure. The result is a stiff, lightweight material with excellent damping qualities.

Surround: The cone is bonded to the basket with a soft butyl rubber surround. The injection-molded butyl rubber is tuned to absorb unwanted cone resonance. In addition, the surround is resistant to ultraviolet rays, temperature extremes, and humidity to add to the speaker's reliability and longevity.

Phase Plug: The bullet-shaped phase plug in the center of the driver ensures a smooth, flat, off-axis frequency response by preventing the high frequency sound waves emanating from one side of the cone from interfering with sound waves from the other side of the cone. The phase plug can be removed to convert the SR5250 into a coaxial speaker.

Basket: The woofer features a high-mass cast aluminum basket. The basket and magnet cover are one piece with heat sink fins that draw heat away from the voice coil, increasing power handling and reliability.

Voice Coil: The voice coil is wound around a 1-1/2" diameter low-mass, high temperature polyimide former. The large diameter coil contributes to the high bass output and high power handling of the driver.

Neodymium Magnets: The speaker uses a Neodymium magnet, which has a similar magnetic flux density to a ceramic magnet 10 times its size.

Mounting Rings: Mounting rings are included which reduce the mounting depth and increase the mounting height, both by 0.36 inches. The effective frame diameter of the woofer when using the mounting ring is 6.298", meaning it covers a 6-1/2" or 6-3/4" speaker opening, but the screw holes don't match either standard application.

5x7/6x8 Adapters: The woofers can be mounted in many 5x7/6x8 applications when used with the supplied adapters.

Terminals: The woofers have typical quick-slide terminals, and also have screw terminals which will accept bare wire or spade terminals.

Tweeter Features

Ring Radiator Tweeter: The SR5250 has a 22mm (7/8") Ring Radiator tweeter, the same type as used in high-end audiophile home speakers. The Ring Radiator's ultra-light woven diaphragm is supported at two pivot points, with the voice coil attached approximately midway between the two pivots. Since there is a very small diaphragm area that is unsupported, there is less opportunity for the development of performance-robbing resonance. The phase plug, similar to the one found on the woofer, prevents phase cancellations, so you get a flat, smooth frequency response, both on- and off-axis.

Extended High Frequency Response: The tweeter's frequency response goes well beyond 20kHz; to 40kHz overall and to 30kHz at -3dB. This drives resonant peaks beyond audibility, and gives the speaker more overall detail and lower distortion levels.

Dual Neodymium Magnets: The tweeter has two Neodymium magnets to provide a powerful magnetic field for the voice coil, while still maintaining the tweeter's compact dimensions.

Faraday Cap: The motor structure includes a copper Faraday Cap on the pole piece to flatten the impedance curve, lower distortion, and extend and improve high frequency response.

Mounting Options: The tweeter can be mounted a variety of ways. When the speakers are mounted as separate components, the tweeter can be mounted in a straight flush-mount cup or in an angled flush mount cup. In addition, you can remove the woofer's phase plug and mount the tweeter on the woofer as a coaxial speaker. When configured as coaxials, the tweeter speaker wire is threaded through the magnet and adds approximately 1/16" to the mounting depth. The tweeter adds a little over 3/4" to the mounting height, for a total of 1.141 inches. The tweeter can also be mounted in the 5" x 7" adapter.

Crossover Features

High Quality Components: The SR5250 crossover uses 1% tolerance resistors and capacitors to ensure the woofers and tweeters are perfectly matched to provide a solid, stable, and consistent stereo image. Air Core Inductors with Oxygen-free copper wire are used for wider dynamic range, contrast, and punch.

Zobel Network: The crossover includes a Zobel network, which flattens the system's impedance curve for a more efficient power transfer and flatter response.

Bi-Amping: The crossover's circuit board includes two jumpers which can be configured for single amplification or bi-amping. You can independently drive the woofer and tweeter with separate amplifier channels when the jumpers are removed. If driving the woofer and tweeter from the same channel, the jumpers should remain installed.

4-Position Tweeter Levels: You can adjust the output level of the tweeter at the crossover by positioning a jumper to one of four positions: -3dB, -1.5dB, 0dB, or +2dB.

Crossover Slopes: The crossover includes a 2nd order, 12dB per octave low pass filter for the woofer, and a 3rd order, 18dB per octave high pass filter for the tweeter. The crossover frequency for both high- and low-pass filters is 4600 Hz.

Tweeter Protection: The crossover's Tweeter Protection device limits the current flowing into the tweeter, preventing damage to the tweeter when it is operated beyond safe operating levels.

Heat Sink: The crossover is housed in a heavy-duty solid cast aluminum chassis which acts as a heat sink for cooler operation and longer reliability.


Tweeters (mounted separately):

  Straight Flush Mount 15° Angled Flush Mount
Mounting Height 0.388" (incl. grille) 0.826" (incl. grille)
Depth 0.897" 0.603"
Frame Diameter 2.242" 2.333 Width, 2.375 Depth
Cutout Diameter 1.949" 1.502"

Crossover: The crossover dimensions are:

  • Width: 6.767"
  • Height: 1.585" (chassis) / 1.890" (overall, including knobs)
  • Depth: 4.518"

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