JBL GTO629 Detail Review - Car Music Lab
JBL GTO629 Detail Review

JBL GTO629 Detail Review

The JBL GTO629 speakers are the ideal upgrade to your present speakers. They are made with a carbon-injected cone material to reproduce music the way the artist initially intended accurately.

The three-ohm voice coils let the speaker function at an efficient 4 ohms on powering, this enables them to utilize every watt of power your head-unit or 4-ohm stable amplifier can generate. These speakers have a vented magnet with a high thermal-capable voice coil which effectively disperses heat, ensuring your product lasts long.

The edge-driven speaker cones allow higher sound levels with the same amount of power. The high-frequency responses that the JBL GTO629 speaker offer will leave your ears very satisfied when you are listening to your favorite kinds of music. If you are looking for quality, the GTO series speakers by JBL have the technologies to meet your need.



The JBL GTO629 is a traditional two-way mid-tweet type coaxial speaker that uses a six-inch mid-range and one-inch textile dome tweeter. The system is rated for 180 watts peak or 60 watts of continuous power. Thanks to smartly-designed steel mounting adaptor rings, the JBL GTO629 coaxials can be mounted in various hole sizes from 6 to 6.75 inches.

The minimum mounting depth is approximately two inches, so these speakers will fit likely fit in any door. If you would like to surface mount the speakers on the top of your door, you will be happy to know a lovely set of grilles is included along with all the required mounting hardware. Speaker wire sold separately.

25–180 Watts Suggested Amplifier Power Range

 JBL engineers designed the JBL GTO629 coaxial speaker to produce sharp, clear sound from a head unit or amplifier capable of delivering up to 180 watts of power. This makes the JBL GTO629 an ideal match to systems powered with head-unit or factory amplifier power levels.

Even better, the speaker fits many of the GTO Series amplifier combinations. Hence, it can keep up with systems that feature one or more subwoofers. And its excellent power-handling specifications increase reliability over the lifetime of the speaker.

Patented Plus One woofer – Cone Technology


The JBL GTO629’s Plus One carbon-injectedcone provides more overall speaker cone area than other similar cones. Thespeaker radiates more air with an effective increase in cone area. Its carbon-injected cone material results in a stiffer and lighter cone. This results in abetter low-frequency response and seamless production of important musicalnotes that people often associate with larger speaker sizes.

Carbon – Composite Non-Magnetic Frame


On the off chance that you are looking fora durable speaker, the JBL GTO629 is what you need. Our Carbon-Composite,non-magnetic frames maintain their precision and integrity even under the mostdemanding conditions.

True 4 Ohm Technology

Three-ohm voice coils in the JBL GTO629speakers allow compensation for any added resistance by thin factory-installedspeaker wiring. They also offer more output than similar factory-installedspeakers.

Vented Magnet Assemblies

 Thepresence of vented magnet assemblies in the JBL GTO629 cools the voice coil.Thereby increasing reliability from a higher power handling and eliminatingpower compression that can distort the speakers’ sound.

Frequency Response to 21 kHz

A wide frequency response that extendsbeyond 20 kHz helps to compensate for speaker placement variations in yourvehicle and for human hearing deficiencies in the high-frequency spectrum above15 kHz. The result is that the JBL GTO629 speakers provide more of thefull-range frequency response associated with quality sound.

High Sensitivity (93dB@2.83V/1m)

High sensitivity lets a wide range of power to deliver quality sound without the audio system getting overdriven. With a 93 decibels sensitivity at 2.83 volts/1 meters, the JBL GTO629 6- 1/2” speakers achieve great musicality and volume with as little as 5 watts RMS. Hence delivering an overall better performance with moderate power driving the speaker. Better performance makes the speakers a perfect replacement for factory speakers and for any aftermarket speaker installation.

UniPivot and Adjustable Tweeter Level

The JBL GTO629 feature UniPivot; aninnovative feature that enables the tweeter to be aimed at the listeninglocation for high-frequency response at the listener’s ear and better stereoimaging. You can as well easily adjust the tweeter output from 0 to +3 decibelsto make up for off-axis and low mounting positions or road noise.

Edge – Driven, Soft- Dome Tweeter Diaphragms

The edge-driven, soft-dome tweeter designin the JBL GTO629 boosts power handling while decreasing high-frequencydistortion. Edge-driven tweeters also have better distribution features andallow a lower crossover frequency, which improves imaging. Thereby deliveringclarity and better vocals in your music. There is no sense having it loud if itdoes not sound clean, too.

Speaker Grilles and Adapter Mounting Rings Included

 TheJBL GTO629 speakers are equipped with an extra set of mounting adapter rings toenable the speakers to fit nicely in a broad range of factory speaker openingsthat match this size. Also, attractive black metal mesh grilles are included toprotect the speaker whenever it’s mounted in a location requiring a grille.

Size Classification Note

 TheJBL GTO629 speakers are marketed as 6-1/2″; they’ll fit standard 6-1/2speaker openings, but do not make use of the industry-standard bolt pattern.Without using an adapter bracket or drilling new screw holes, the speakers fitseveral standard 6-3/4 applications. The included metal brackets adapt thespeakers to standard 6-1/2 three-hole and Ford non-symmetric four-holepatterns. With new holes drilled in the mounting surface of the car, nobrackets would be needed. Brackets are also included that fit select oversized6-3/4 installations in a variety of vehicles.

What’s in the box?

  • Two 2-way speakers
  • 2 Grilles
  • 2 Plastic 6-3/4 adapterbrackets
  • 2 Metal adapter rings
  • 2 JBL logo badges
  • 2 Adhesive-backed foam gasketstrips
  • Eight 1-3/8″ Self-tappingAllen head screws
  • 3mm Allen head bit
  • Eight 1/2″ Self-tappingscrews
  • Eight M3x10mm Machine screws
  • 8 Speed clips
  • Instruction manual


JBL has been producing high-qualitygood-sounding speakers for a very long time, and the JBL GTO629’s follow inthat pattern. These are well-made, good-sounding speakers with some of the bestmid-range performance at an affordable price. You can check them out at a JBLretailer near you and let a trial convince you!

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