Item# GTO638



180-watt, three-way, 6-1/2" speakers
$66.95 per pair $129.95


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Does It Fit My Car?


Pop the JBL® GTO638 into any factory location with no special tools or modifications. You’ll suddenly have the big, booming bass and the rich, crisp, detailed sound that make JBL® products famous – in your car. (Yes, your car.) You’ll hear the power of JBL-patented Plus One® woofer cones and a My-Ti™ tweeter. A very large voice coil, like the ones the best home audio speakers have, delivers crystal-clear, extended high frequencies for audiophile-quality performance. And a UniPivot™ (patent number 6,002, 780) tweeter pod gives you control of imaging even if the speaker has to be mounted low. In the GTO638, you’ll find attention to detail that’s rarely given to car audio. And it’s a game-changer.

What's in the box?

  • (2) GTO638 speakers
  • (2) Mounting brackets
  • (2) Grilles
  • (2) Buffer for mounting bracket/grille
  • (4) Sets of speaker wire
  • (16) Screws
  • (1) Owner's Manual

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Our proprietary Plus One® woofer cone (patent number 7,548,631) is exceptionally stiff and lightweight and has up to 25 percent more active surface area than you’ll ever find on competing models of the same size. It delivers an audible increase in bass output and efficiency.

The GTO683 has a high-bandwidth, edge-driven textile-dome tweeter with a large voice coil, just as high-end home audio loudspeakers do. The tweeter’s My-Ti™ (a proprietary Mylar®-titanium blend) alloy delivers great power handling, extended high frequencies and seamless integration with the woofer.

By using a built-in crossover network with advanced high-pass and low-pass filters, the GTO638 creates a smooth transition between the woofer and tweeter. The result? Midrange vocals that sound so natural and lifelike, you’d think the vocalist was sitting in the passenger seat.

The Intermount III (patent number 6,505,705) system makes installation easy. Using its JBL® installation rings (included), you can fit the GTO638 into factory-built installation locations varying from 6 to 6-3/4 inches. It even simplifies the replacing of aftermarket speakers.

The GTO638 is compatible with aftermarket head units and factory-installed systems. Designed to replace factory-installed OEM (original-equipment manufacturer) speakers, the GTO638 is easily installed into nearly any factory-built 6-1/2-inch location – and doing it won’t require special tools or modifications.

For the most powerful performance, the GTO638 makes the best use of any amplifier by providing an optimum 2-ohm load. It uses a lower-impedance voice coil than a typical speaker to extract the most power and performance possible from all amplifiers engineered to drive loads of 4 ohms or less.

This muscular speaker offers 180 watts of peak power. Hit the gas and have fun.

The GTO 638 allows the tweeter level to be adjusted 0 to +3 decibels to compensate for low and off-axis mounting positions or road noise.

Grand Touring
Nominal Impedance
2 ohms
(2.83V@1m) 92dB
Power Handling (RMS)
Frequency Response
50Hz – 21kHz
Power Handling (Peak)

1 Year Warranty

Products purchased online or from an authorized local retailer and under warranty may qualify for an exchange with a valid receipt.

Purchases made from an unauthorized dealer will not be elibible for exchange.

Request an Exchange

Call us: 1.800.336.4525

  • Sales and pre-sale assistance
  • Technical help
  • Parts and accessories


GTO638 is rated 5.0 out of 5 by 3.
Rated 5 out of 5 by from Amazing for the low price! I purchased a pair of 638s and 938s for my 2009 Toyota Venza and they sounded amazing with the stock non-JBL sound system, which is the lowliest on the Venza. They sounded loud enough for not being amplified. But I wanted to test them good, so I added an old-school Rockford 500a2. WOW! They got obscenely loud. How can these cheap speakers sound this good? They're made by JBL. Based on my good experience with these GTO speakers, I purchased a pair of amplified JBL LSR308 studio monitors for my music production. They don't sound loud like these GTO models but have some of their warmth and clarity. JBL are masters at their craft! You pay the price for entry-level speakers but the sound and quality is outstanding. These GTO speakers not only sound excellent, but can get LOUD without distortion. Seriously, they get impressively loud without losing clarity. I'm buying another set for my sister's car AND also for my car, since I don't have the Venza anymore. JBL has return customers for a reason. They make good products even on their entry-level lines. I'm tempted to upgrade to the Power series but these GTO series are flawless. I can't imagine a reason to get anything louder than these! BELIEVE ME!
Date published: 2015-10-09
Rated 5 out of 5 by from Super clear, good bass, overall amazing I put these and the GTO928 three way 6x9 in my 1992 Chevy Cavalier let me tell you these aren't your 90s stock speakers. I could not believe how great these sounded even compared to just everyones cars that are newer. I have the best sounding and loudest bass speakers out of everyone i know thanks JBL!
Date published: 2015-09-22
Rated 5 out of 5 by from crystal clear i wanted to upgrade my sound in my 2011 corolla s. so i read all types of reviews and watched youtube videos and everybody said nothing by great things about these speakers. and they were so right. the 638's in my front doors sound amazing. when they say concert sound they mean it. crystal clear highs and mids. i also put the 938's in the rear and they bang with no distortion. forgot to add, that im using the factory head unit and no amps. jbl is the best hands down
Date published: 2014-06-07
  • 2015-11-30T08:00CST
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  • clientName_JBL

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