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JBL 621 Concert Series 6-1/2" 2-way car speakers with grilles

Item # 109CT621G

Bring on the big fun of being there live, but leave off the big price tag — that's the idea behind JBL's...

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Bring on the big fun of being there live, but leave off the big price tag — that's the idea behind JBL's...

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7 questions - 12 answers

Item # 109CT621G

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About the JBL 621

Alexander H.

Cool speakers with grilles

Bring on the big fun of being there live, but leave off the big price tag — that's the idea behind JBL's Concert Series car speakers. Their Concert 621 6-1/2" coaxial speakers deliver a strong sound with a striking design, accented by JBL's "exclamation point" logo on the tweeter. And the speaker's patented Plus One™ structure extends the surface area of the polypropylene woofer cone to give you a better low-frequency experience. Grilles are included.

Cool speakers with grilles

Bring on the big fun of being there live, but leave off the big price tag — that's the idea behind JBL's Concert Series car speakers. Their Concert 621 6-1/2" coaxial speakers deliver a strong sound with a striking design, accented by JBL's "exclamation point" logo on the tweeter. And the speaker's patented Plus One™ structure extends the surface area of the polypropylene woofer cone to give you a better low-frequency experience. Grilles are included.

A match for any system

These 3-ohm speakers are sensitive enough that you can power them with an aftermarket stereo, but you'll get even better results feeding them power from an outboard amp.

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Product highlights:

  • 6-1/2" 2-way speakers (pair)
  • polypropylene Plus One™ woofer cone with rubber surround
  • PEI dome tweeter
  • handles up to 45 watts RMS (135 watts peak power)
  • frequency response: 55-20,000 Hz
  • impedance: 3 ohms
  • sensitivity: 92 dB at 2.83V
  • top-mount depth: 1-15/16"
  • grilles included
  • warranty: 1 year
  • MFR # SPKCON621AM

What's in the box:

  • Two 2-Way speakers
  • 2 Grilles
  • 2 Grille frames
  • Eight 1" Screws
  • 8 Speed clips
  • Installation instructions
  • Template on box

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Customer reviews for JBL 621

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Average review:

4.5 out of 5 stars
90 reviews

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More details on the JBL 621

Pat M.

Features & specs

General
Speaker Size 6 1/2
Design 2-way
Tweeter Design Dome
Impedance (Ohms) 3
Tweeter Composition PEI
Woofer Composition Polypropylene
Woofer Surround Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Specifications
Sensitivity (1W at 1 meter) N/A
Sensitivity at 2.83 volts 92
Frequency Response 55 - 20k Hz
Minimum RMS Wattage ---
Maximum RMS Wattage 45
Peak Power Handling (Watts) 135
Top-mount Depth (Inches) 1 15/16
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) 5
Mounting Height (Inches) 0.582
The JBL 621 replaces these items:

Product Research

Features

Plus One+ Woofer Cones: Each speaker uses a cone larger than other speakers of the same size. This is accomplished by using a unique basket design and hi-roll surround. The Plus One+ design offers greater bass output and an increase in efficiency.

High-Output Design: The 3Ω voice coil design compensates for the high in-line resistance of small gauge factory wiring, extracting more power from factory (or aftermarket) receivers. This results in clearer, richer sound for the listener.

Mounting: Without an adapter, these speakers fit standard 6¾" applications. Given their required cutout, they will also fit many 6½" applications without an adapter, but new screw holes must be drilled. Please enter your vehicle information to confirm fit.

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Customer Q&A

7 questions already asked

Q
Curious on what amp would work well for this in a 06 hummer if I put these on all four of my doors?
anthony g  Jun 22, 2023
1 answer
A
These crisp JBL 621 Concert series 6 1/2" speakers can handle 45-watts RMS, Anthony. For the Hummer I would suggest using the JBL Apex PA454 compact 4-channel amp in the link below. The PA454 matches the rated power and is marine rated for extra moisture and shock protection if you are taking your Hummer offroad. It also has speaker-level or line-level inputs so it can work with OEM or aftermarket radios. https://www.crutchfield.com/p_109APEX454/JBL-Apex-PA454.html
bo  Jun 23, 2023 (Staff)
Q
Are any of the parts for the scratch and dent JBL 621 Concert Series 6-1/2" 2-way car speakers with grilles replaced with generic parts?
susan  May 23, 2023
1 answer
A
Greetings Susan, and thank you for your question. The only parts that may be generic would be the included screws, and speed clips. The speakers, grilles and grille frames are all JBL.
hogan  May 23, 2023 (Staff)
Q
Is 1 set for both passenger and driver door?
canyin  Jan 05, 2021
2 answers
A
Yes
al  Jan 05, 2021
A
Yes, 2 speakers per set. I put 4 of these in my Honda and they sound great.
david  Jan 05, 2021
Q
Do you recommend an amp with these? If I buy 4 speakers (2 pairs) what kind of amp rating will I need for 45W RMS at 3ohms since ampa only say 2 or 4 ohms.
alfred e  Oct 26, 2020
1 answer
A
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.
thomas  Nov 25, 2020 (Staff)
Q
Looking to upgrade from the stock speakers in my 2018 Silverado. Wanting to make sure the factory stereo will drive them ok and if there is are wire adapters that are needed so the factory speaker plug doesn??????t have to be cut off?
scott a.  Jul 25, 2020
6 answers
A
The JBL 621 will be good upgrade speakers, replace all at the same time to get true sound of JBL. I also replaced speakers only in my Camry with 621 and they made big improvement with revealing more true sounds not heard with stock speakers.
abel  Aug 12, 2020
A
I can???t answer the questions as my sierra was an 05. I would think your radio would power them but not sure of your plug.
al  Aug 11, 2020
A
These will work well in the Silverado's that have a system where the radio powers the speakers. They do not work well in the Silverado's that come with a separate amp to power the speakers. If you are not sure about your's I recommend contacting an advisor on 1-800-324-9695 to check and get a personal recommendation if your pickup has the separate factory amp. As for the wiring, we have wiring harnesses that allow speakers to be plugged into the stock wiring of those pickups. We send those harnesses free with the speaker purchase
jason  Aug 11, 2020 (Staff)
A
I put the JBL concert series 3 way in my 08 Civic and they sound great, I upgraded to a Pioneer touchscreen head unit tho. Great choice in speakers, I'm very happy with mine.
david  Aug 11, 2020
A
These speakers were a great upgrade. The sound is crystal clear without being too tinny or bright. Your stock system should drive them just fine. They have a great sound especially for the price. They came with wiring adapters so there is no cutting or splicing required.
kent  Aug 11, 2020
A
You will have to cut the wires if youre going to use these speakers.
nathan e  Aug 11, 2020
Q
On the JBL 621 speakers, how deep are they, from the surface?
stephen  Jun 21, 2020
1 answer
A
Not sure. Seemed to be very close to originals in depth. I honestly dont remember checking the distance. Only matching the originals
al  Jun 21, 2020
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