If you want a fantastic bang-for-your-buck speaker upgrade for your car or truck, check out the Rockford Fosgate T1650 Euro-Fit speaker set. Using many of the same technologies found in the popular Power Series T1 components, these speakers optimize every dimension to deliver impressive efficiency and great bass output while delivering crystal-clear sound.
What Size Are My 6.5-inch Speakers?
You’d think that cars and trucks that use “6.5-inch” speakers would all be the same, right? The reality is, some OE speakers in this class are closer to 6 inches in diameter, while others are closer to 7. Rockford’s Power Series coaxial speaker offerings include three size solutions to optimize the upgrade in your vehicle. The T16 models are 6-inch speakers and fit in cut-outs with a 5.04-inch diameter. At the other end of the scale are the T1675 speakers, which are a 6.75-inch set and require a 5.68-inch cut-out. In the middle, we have the T1650 speakers that we’ll focus on for this spotlight. These two-way drivers mount in a 5.51-inch cut-out, have an outer diameter of exactly 6.5-inches and require 2.5 inches of mounting depth.
Rockford T1650 Features
The T1650 speakers are based around a custom-tooled, stamp-cast aluminum frame. Rockford Fosgate optimizes the rigidity of the design by including curved elements in both the vertical and lateral axis. Of note, there are four cooling vents near the magnet to let hot air escape from the outside of the voice coil and prevent air from pressurizing under the spider as the cone travels forward and rearward from rest. Also worthy of mentioning is the die-cut foam gasket on the rear of the mounting flange that helps to seal the speakers against the mounting surface. Not many companies include these gaskets, especially at a price point under $150 USD.
In terms of moving parts, the speakers use a carbon fiber-filled polypropylene woofer cone that’s suspended by a Santoprene rubber surround at the top and a long-lasting poly-cotton spider at the base. Rockford’s Vertical Attach Surround Technique (VAST) optimizes cone area by minimizing the width of the surround. Of course, the design team used its Klippel test equipment during the development process to ensure that these speakers operate linearly to minimize distortion.
At the base of the cone is a 1.1-inch diameter, high-temperature aluminum voice coil former with a winding that presents a 4-ohm load for the amplifier. Spade terminals in 0.25- and 0.205-inch sizes are provided for electrical connections.
One of the features that separate this speaker’s design from most competing products is how the tweeter is mounted. In most 6.5-inch speakers, the tweeter is mounted on a post that extends forward from the T-yoke through the center of the woofer cone. While this works fine, it sacrifices some cone area and reduces the efficiency of the driver. Rockford chose to mount the tweeter on a bridge that extends from the lower edge of the basket. The tweeter is angled upward to allow the installer to optimize the delivery of the highest-frequency information to the listener.
The tweeter itself is a 1-inch aluminum-dome design that has been treated to prevent unwanted diaphragm resonance. Importantly, Rockford Fosgate has integrated a 12 dB/octave tweeter filter network into the speaker to ensure a smooth transition with the woofer.
Going back to the basket design, these speakers feature Rockford’s FlexFit 2 mounting solution. Rather than being riddled with holes, the driver mounting lip includes eight holes and eight slots that make them compatible with a variety of vehicles to save your installer time and hassle. Last and certainly not least, Rockford includes a set of perforated steel mesh grilles with the speakers for custom installations.
Let’s Look at the T1650’s Specifications
While design features are cool, how all those components come together is crucial to recreating your music with accuracy and exuberance. Rockford Fosgate rates the T1650 to handle 75 watts of power continuously and 150 watts maximum. The drivers have a Qts spec of 0.74, indicating that they are designed for installations in an infinite baffle application like the door or rear parcel shelf of a vehicle. This Q factor also indicates that the speakers will reproduce bass without the unwanted distortion that would be found from drivers with Qts values above 0.8. With that said, the compliance (Vas) specification is low enough that an enclosure with an internal volume of 0.5 cubic foot or larger won’t result in unwanted resonance in the midbass region (100-200 Hz).
Finally, the Xmax specification, which describes how far the woofer cone can move forward or rearward from rest, is an impressive 5 mm. This spec is more excursion than on some high-end component woofers in this size range. The transducer design team at Rockford Fosgate knows what they’re doing.
Upgrade the Speakers in Your Car or Truck Today
If you’re shopping for a 6.5-inch speaker set to upgrade your car audio system, drop by your local authorized Rockford Fosgate retailer and ask for a demonstration of the T1650 set. Their unique combination of features will undoubtedly prove to be impressive. You can find a Rockford Fosgate dealer near you by visiting the dealer locator on their website. You can keep up with the newest product releases from Rockford by liking their Facebook page and following their Instagram feed. They also offer informative and entertaining videos on their YouTube channel.
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