The frequency response is stated to be 50 - 7000hz, BUT I would not pay attention to the 50hz side of that. It won't do well above 7000hz, but it can definitely go lower than 50hz. I've designed multiple subwoofers under 5 inches that can hit below 40hz easily. All it takes is for the box to be tuned correctly. Don't underestimate the power of a tuned enclosure!

can this speaker be used as a subwoofer?

It has a great sound good frequency response and is a very good overall speaker but is not a true subwoofer.

I want to use them to replace the woofer in a set of jbl j520m surround sound (rear channel) speakers, is that a good idea?

As long as they fit and the impedance is correct, these would be a great replacement speaker. They have great sound and a wide frequency response. I was very pleased with them. I too used them as a replacement speaker. Good choice.

ASIN	B007K8M7HO
Audio Driver Size	5 Inches
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#197,589 in Electronics ( See Top 100 in Electronics ) #323 in Home Audio Subwoofers #1,154 in Car Component Subwoofers
Color	Black
Compatible Devices	Desktop, Television, Projector
Control Method	Touch
Customer Package Type	Standard Packaging
Customer Reviews	4.3 4.3 out of 5 stars (32)
Date First Available	March 14, 2012
Impedance	8 Ohms
Is Waterproof	FALSE
Item Weight	3 pounds
Item model number	DS175-8
Manufacturer	Dayton Audio
Material	Rubber
Model Name	DS135-8
Number Of Circuits	1
Number of Items	1
Power Source	Corded Electric
Product Dimensions	5 x 5 x 3 inches
Recommended Uses For Product	For Music Players, For Home Theaters, For Surround Sound Systems
Series Number	135
Shape	Rectangular Prism
Speaker Size	5 Inches
Speaker Type	Woofer
Special Feature	Optimized to produce a smooth drop point of 3dB and high output potential
Style	Modern
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	5 Inches
Surround Sound Channel Configuration	5.1, 7.1
Tweeter Diameter	1 Inches
UPC	844632095399
Unit Count	1.0 Count
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Communication Technology	No Wireless Communication Technology
Woofer Diameter	5 Inches

DAYTONAUDIO DS135-8 5" Designer Series Woofer Speaker

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