Product highlights

5-1/4" 2-way speakers (pair) 

Plus One+ polypropylene woofer cone with hi-roll rubber surround 

1/2" textile balanced-dome tweeter 

True Four Ohm Impedance technology 

speaker's 3-ohm impedance combines with speaker wire impedance for a 4-ohm load 

compatible with virtually all factory or aftermarket car stereos 

handles up to 45 watts RMS (135 watts peak power) 

frequency response: 67-21,000 Hz 

sensitivity: 92 dB at 2.83V volts 

top-mount depth: 1.915" 

grilles not included 

warranty: 1 year 

What's in the box

• Two 2-way speakers 
• 2 Adhesive backed foam gasket strips 
• Instruction manual 
• Template on box 

About this item

Written by Crutchfield's Dave Delamere

A modern classic

Just as they were throughout my 16 years as a Crutchfield Advisor, Infinity's Reference Series speakers remain a popular choice for upgrading from factory speakers. The REF507F 5-1/4" 2-way car speakers follow that Infinity heritage by offering the killer combo of high efficiency and superb sound.

Infinity's famous ingredients

Reference Series speakers deliver powerful sound every mile you drive, thanks to oversized polypropylene woofer cones with durable hi-roll rubber surrounds. The cones move more air than other speakers of similar size, adding plenty of punch to the speaker's impressive performance. The 1/2" textile balanced-dome tweeters deliver clear and smooth highs, for a sound that's definitively Infinity.

Excellent power-handling

These speakers will blossom when powered by an external amplifier, but they're also sensitive enough to be a good match for a factory or aftermarket stereo. Plus, Infinity has come up with a safe way to get a little more power out of your system — these 3-ohm speakers work in combination with the speaker wire in your car so your car stereo sees a true 4-ohm impedance.

Grilles are not included; the factory grilles should be suitable for most applications.