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Focal ISU 165 Universal Integration Series 6-1/2" component speaker system

Item # 091ISU165

You're ready: to do away with unbearable factory sound and to gain a totally authentic experience listening to...

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You're ready: to do away with unbearable factory sound and to gain a totally authentic experience listening to...

9 questions - 11 answers

Item # 091ISU165

About the Focal ISU 165

Alexander H.

Upgrade with Focal quality

You're ready: to do away with unbearable factory sound and to gain a totally authentic experience listening to music in the car. With Focal's Universal Integration Series speakers installed in your car, a new era has begun — one in which it's easy to enjoy every moment of your drive. Focal provides such a dramatic boost in sound quality by applying much of the same technology in these car speakers that they use in their studio and audiophile-grade home systems.

Upgrade with Focal quality

You're ready: to do away with unbearable factory sound and to gain a totally authentic experience listening to music in the car. With Focal's Universal Integration Series speakers installed in your car, a new era has begun — one in which it's easy to enjoy every moment of your drive. Focal provides such a dramatic boost in sound quality by applying much of the same technology in these car speakers that they use in their studio and audiophile-grade home systems.

Superior materials and design

Focal's ISU 165 6-1/2" component speaker system employs a polyglass woofer cone to give you a warm, natural sound with enhanced strength for accurate playback with no added resonances. An integrated phase plug in the woofer improves sound dispersion for a better audio experience, no matter where you're sitting in the car. An aluminum/magnesium inverted dome tweeter, backed by an in-line crossover, delivers astonishing detail in the high range and integrates an acoustic horn design for an improved soundstage across your dash. Focal also gives you two mounting options for a smoother installation. 

High sensitivity design

Planning to drive these speakers off a head unit? No problem. They're designed to take advantage of every bit of power supplied to give you the best audio quality possible. However, Focal's famous sound soars when powered by an aftermarket amp!

Installation note: You'll need a pair of our universal backstraps to install the tweeters in the factory locations.

Grilles are not included; the factory grilles should be suitable for most applications.

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Product highlights:

  • component speaker system includes two woofers and two tweeters with inline crossovers
  • 6-1/2" polyglass woofer with butyl rubber surround
  • aluminum/magnesium inverted dome tweeter with acoustic horn design
  • tweeter installation accessories included
  • 4-ohm impedance
  • handles up to 70 watts RMS power range (140 watts peak)
  • frequency response: 60-21,000 Hz
  • sensitivity: 93 dB
  • woofer top-mount depth: 1-15/16"
  • grilles not included
  • warranty: 1 year
  • MFR # FOCAL ISU165

What's in the box:

  • Two woofers
  • Two inverted dome tweeters (each with 5" length of speaker wire attached)
  • 2 Flush mount tweeter housings (with tweeters installed)
  • 2 Angled surface mount tweeter housings
  • Two 18" Lengths of speaker wire with in-line tweeter crossovers
  • Two 7" Lengths of speaker wire with in-line woofer crossovers
  • 2 Woofer mounting gaskets
  • 8 Speed clips
  • Four 1" Flathead screws
  • Eight 1" Pan head screws
  • User manual (English/ French/ German/ Italian/ Spanish/ Portuguese/ Dutch/ Russian/ Polish/ Arabic)
  • Focal window sticker

Customer reviews for Focal ISU 165

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4.5 out of 5 stars
43 reviews

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More details on the Focal ISU 165

Pat M.

Features & specs

General
Speaker Size 6 1/2
Design 2-way
Tweeter Design Inverted Dome
Impedance (Ohms) 4
Tweeter Composition Aluminum/Magnesium
Woofer Composition Polyglass
Woofer Surround Butyl Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Specifications
Sensitivity (1W at 1 meter) N/A
Sensitivity at 2.83 volts 93
Frequency Response 60 - 21k Hz
Minimum RMS Wattage ---
Maximum RMS Wattage 70
Peak Power Handling (Watts) 140
Top-mount Depth (Inches) 1 15/16
Bottom-mount Depth (Inches) 2 1/16
Cutout Diameter or Length (inches) 5 5/8
Mounting Height (Inches) 0.311
Frame Width 6.532
Frame Length 6.532
The Focal ISU 165 replaces these items:

Product Research

Woofer
Tweeter

Woofer

Polyglass Cone: The woofer cone has a cellulose pulp base and is coated with a uniform deposit of hollow glass microballs. The addition of the Polyglass layer significantly increases the cone's rigidity without adding much weight. This combination takes advantage of the accuracy and neutrality of the hard outer surface, but maintains the superior damping characteristics of the cellulose pulp.

Surround: The butyl rubber surround is resistant to ultraviolet rays, temperature extremes, and humidity to add to the speaker's reliability and longevity.

Phase Plug: The bullet-shaped phase plug in the center of the woofer ensures a smooth, flat off-axis frequency response by preventing the high frequency sound waves emanating from one side of the cone from interfering with sound waves from the other side of the cone.

Size Classification Note: Crutchfield has traditionally referred to this size woofer as a 6-3/4", while some manufacturers, including Focal, call it a 6-1/2". Please enter your vehicle information to confirm fit.

Woofer Crossovers: The included 7" woofer wires have integrated crossovers. The woofer ends of the wires have female quick-slides that easily connect to the woofer terminals.

Tweeter

Inverted Dome Tweeter: The tweeter is an inverted aluminum and magnesium dome, producing a broad sound stage. The tweeter has a Neodymium magnet to provide a powerful magnetic field for the voice coil, while still maintaining the tweeter's compact dimensions.

Note: When flush mounted, the tweeters are pressure fit into the opening, with nothing holding them from behind, so the cutout diameter is very important.

Mounting Options: The tweeters include flush mount and angled surface mount housings:

  Flush Mount Angled Surface Mount
Mounting Height 0.312" 2.105"
Mounting Depth 0.658" 0.875" (screw depth)
Frame Diameter 1.957" N/A
Cutout Diameter 1.74" N/A
Width N/A 1.968"
Surface Depth N/A 3.114"

Tweeter Crossovers: The included 18" tweeter wires have integrated crossovers. The tweeter ends of the wires have quick-slide terminals that easily connect to the wires soldered to the tweeters. The input end of each wire has three leads, a negative and two positives. The positive leads are labeled Car and Display, with a lower output level from the Car lead (useful because the placement of the woofer in a typical car installation requires the tweeter output be lowered to maintain a balanced sound).

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Customer Q&A

9 questions already asked

Q
Hi I purchased one pair of focal Isi 165 for my front doors. Even though your site clearly shows the contents of the box, I did not realize that it did not come with a passive crossover. How do I wire the speaker and woofer together to run off one channel? Iâ??m using a JL audio xdv2 700 amp. Thank you.
paul  Dec 30, 2023
1 answer
A
The Focal ISU 165's do come with an in-line passive crossover on the tweeter wires that must be used on install, Paul. When wiring together on one channel of your amp, you would wire the woofer and tweeter in parallel, making sure to use the included in-line crossover or you will damage your tweeters. I hope this helps!
bo  Dec 31, 2023 (Staff)
Q
Hello, I have purchased two pairs of Focal ISU 165s for my front and rear speakers. What amp would work best with my 2021 Honda Accord Sport and how should it be configured?
marcel  Sep 15, 2023
1 answer
A
There are several viable choices for this project. For help with selecting the best one to fit your specific needs, please reach out to our advisors via online chat or phone at 1-800-324-9695.
zachary  Sep 15, 2023 (Staff)
Q
what is the frequency response of the woofer?
terry  Aug 17, 2023
1 answer
A
Focal does not specify the frequency response of the woofer. However, we are provided a 60Hz rating for the set. Additionally, a separate specs sheet for the tweeter available on Focal's website states that the tweeter is rated 4k-21k Hz. With this in mind, it's safe to say that the woofer is rated 60-4k Hz.
zachary  Aug 18, 2023 (Staff)
Q
Do the wires from the woofer and tweeter connect to a single wire going to the amp and does that change the impedance rating?
justin  Apr 11, 2023
1 answer
A
Good question, Justin. These Focal ISU 165 components use an in-line crossover on the tweeters, and each component (woofer and tweeter) is 4-ohms. These are designed to be easily integrated into factory speaker setups. When you are powering with an amp, you can connect the woofer and tweeter to the same channel, it will present a 2-ohm load at your amp. You must confirm that your specific amp is 2-ohm stable. The Focal ISU series is one of my personal go-to choices for amazing sound in your car, no matter what you're rocking on your playlist!
bo  Apr 12, 2023 (Staff)
Q
Hello I have Kenwood Kac-m3004. And I have a honda accord 2017. Will my amp handle those speakers or I should go with only 50 rms? Thank you
rafik  Nov 25, 2021
2 answers
A
Technically yes, but I wouldn't push more than 150watt per each channel. I have already replaced the tweeter once at 300 watts.
donald  Nov 25, 2021
A
That amp will be PLENTY to push these speakers. I'm currently running them off of my pioneer head unit which only produces 22 rms and they are still insanely loud and sound awesome.
andrew  Nov 25, 2021
Q
are these speakers 70 rms per woofer/tweeter?
matthew  Oct 17, 2020
2 answers
A
Up to 140 watts per side (L or R). I run them at 75 watts and they will still be loud enough with the windows down on the freeway. Not a ton of lows though...they're just to shallow.
william  Oct 19, 2020
A
75 RMS
nicholas  Oct 18, 2020
Q
Can these speakers be powered by audiocontrol lc-4.800 amplifier??
nuno  Jun 14, 2020
1 answer
A
I don't see why not you may not need the full potential of the amp
shon  Jun 14, 2020
Q
2018 Honda Civic Hatchback. Fit your vehicle says will need to "surface mount" tweeters. So they will not fit in the factory tweeter holes?
bryce  May 27, 2020
1 answer
A
Hi Bryce, we do extensive measurements for speaker fitment in the vehicles we research. If you see a Surface Mount warning for tweeter placement, those tweeters will not fit in the factory tweeter location. Feel free to chat with us online or by phone at 1-800-324-9695, and Advisor will be happy to assist you with answering additional questions, or providing further information.
jessica  Jun 19, 2020 (Staff)
Q
Why will these speakers not fit a 2017 Nissan 370Z?
randy  May 20, 2018
1 answer
A
You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.
kristina  May 25, 2018 (Staff)
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Enhanced woofer design

The Focal Performance 165AS offers these features:
  • dual fiberglass structure woofer cone
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