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Infinity Primus 753T Primus Series 3/4" tweeters

Item # 108P753T

Infinity knows what music should sound like in the car, and their Primus 753T 3/4" edge-driven silk dome...

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Infinity knows what music should sound like in the car, and their Primus 753T 3/4" edge-driven silk dome...

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Item # 108P753T

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About the Infinity Primus 753T

Alexander H.

Edge-driven tweeter design

Infinity knows what music should sound like in the car, and their Primus 753T 3/4" edge-driven silk dome tweeters deliver, with an open sound and minimal distortion at high volume. Prepare for a more clearly defined soundstage as the natural details in your music come alive. 

Edge-driven tweeter design

Infinity knows what music should sound like in the car, and their Primus 753T 3/4" edge-driven silk dome tweeters deliver, with an open sound and minimal distortion at high volume. Prepare for a more clearly defined soundstage as the natural details in your music come alive. 

Bring on the power

Infinity uses an edge-driven tweeter design and a large voice coil for high power handling. The package includes in-line crossovers that protect the tweeters against low frequencies, along with adapters that allow for surface- or flush-mounting, so that you can get the perfect placement for optimal sound. You can use the included Starfish mounts to place the tweeters in many existing tweeter openings.

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

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Product highlights:

  • 3/4" edge-driven silk dome tweeters (pair)
  • flush- and surface-mount hardware included
  • Starfish™ bracket for mounting in factory tweeter locations
  • passive in-line crossovers included
  • handles up to 40 watts RMS (120 watts peak power)
  • frequency response: 2,000-20,000 Hz
  • sensitivity: 91 dB at 2.83 volts
  • warranty: 1 year
  • MFR # INFSPKPR753T

What's in the box:

  • 2 Tweeters (each has attached 6" speaker leads with male quick-slides)
  • Two 18" Tweeter wires with in-line crossovers
  • 2 Threaded flush-mount cups
  • 2 Plastic locking nuts
  • 2 Surface-mount cups
  • 2 Starfish mounts
  • Six 5/8" Flat head screws
  • Template and specs on box

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4.5 out of 5 stars
16 reviews

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More details on the Infinity Primus 753T

Pat M.

Features & specs

General
Speaker Size 3/4
Design 1-way
Tweeter Design Edge-Driven Dome
Impedance (Ohms) 3
Tweeter Composition Silk
Woofer Composition ---
Woofer Surround ---
Parts Warranty 1 Year
Labor Warranty 1 Year
Specifications
Sensitivity (1W at 1 meter) N/A
Sensitivity at 2.83 volts 91
Frequency Response 2000 - 20k Hz
Minimum RMS Wattage ---
Maximum RMS Wattage 40
Peak Power Handling (Watts) 120
Top-mount Depth (Inches) 0 5/8
Bottom-mount Depth (Inches) 1
Cutout Diameter or Length (inches) 1 1/2
Mounting Height (Inches) 0.335
Frame Width 1.645
Frame Length 1.645

Product Research

Features

Tweeter Mounting: The I-Mount tweeter mounting system and Starfish mounting brackets give you several different ways to mount the tweeters:

  • I-Mount Mounting System: The tweeters can be surface or flush mounted:
    • Surface Mount: Surface mounting the tweeters involves screwing the surface-mount cup to the mounting location, then inserting and locking the tweeter into the cup.
    • Flush Mount: Flush mounting is made easy through the use of the threaded flush-mount housing and plastic locking nut. Once a cutout is made, the tweeter is installed in the flush-mount adapter, then into the flush mount housing and inserted into the hole. The large plastic locking nut is threaded onto the adapter (from behind the mounting surface) to hold the complete assembly securely in place. When flush mounted, the tweeters may be angled for optimum response and imaging.
  • Starfish Mounting Brackets: The Starfish mounting brackets allow the tweeters to be installed in factory locations behind the grilles:
    • Bottom Mount: Once the Starfish bracket is trimmed, it is secured to the underside of the grille panel. The tweeter must be inserted into the bracket and locked into place before the bracket is mounted.
    • Surface Mount: Once the Starfish bracket is trimmed, it is screwed to the top of the mounting surface behind the grille panel. Then, the tweeter is inserted into the bracket and locked into place.
    • Flush Mount: There are two sets of tabs to flush mount the tweeter in the Starfish bracket, yielding different mounting dimensions. The upper tabs mount the tweeter completely below the opening and are glued in place. The lower mounting tabs are screwed in place and result in a mounting height just over 1/3 inch. Once the bracket is mounted, the tweeter is inserted into the bracket and locked into place.

Mounting Dimensions:

  I-Mount Surface Mount I-Mount Flush Mount Starfish Bottom Mount Starfish Surface Mount Starfish Flush Mount
Mounting Height 0.815" 0.355" 0.0" 0.82" 0.334"
Depth 0.5" (screw depth) 0.615" 0.95" 0.5" (screw depth) 0.47"
Frame Diameter 1.48" 1.645" 3" 2.46" 2.6"
Cutout Diameter N/A 1.45" N/A N/A 1.512"

Crossovers: The included 18" wires have in-line 12 dB/octave high pass crossovers with a crossover point of 5 kHz. The tweeter ends of the wires have quick-slide terminals that easily connect to the wires attached to the tweeters. The input end of each wire has tinned bare wire.

Crossover Dimensions:

  • Length: 3½"
  • Width: 1"
  • Height: ¾"

Impedance: The Primus Series speakers feature 3Ω voice coils to compensate for the high in-line resistance of small gauge factory wiring and extract every watt from the factory receiver, increasing overall system output and efficiency (relative to 4Ω speakers). The speakers also benefit from increased power when you upgrade the wire and add after-market amplifiers capable of powering a lower impedance load.

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Customer Q&A

4 questions already asked

Q
How do you install the crossovers for the Infinity Tweeters?
annette  Apr 07, 2023
1 answer
A
Greetings Annette, and thank you for your question. The crossovers are more like filters than block out low frequencies that would damage the tweeters. They are already inline with the 18 inch speaker wire extensions for each tweeter. The picture of those is not on the web presentation, but they are included in the box.
hogan  Apr 07, 2023 (Staff)
Q
Do I need install the crossover if I'm replacing the existing tweeter?
bill j  Mar 17, 2023
1 answer
A
That's affirmative, Bill. You will need to install the included crossovers, not only for best sound but also to protect the Infinity Primus 753T tweeters from damage.
bo  Mar 17, 2023 (Staff)
Q
Will I receive custom instructions on securing the tweeters using backstraps, silicone, or hot glue?
sugardaddy  Dec 13, 2022
1 answer
A
We have not developed custom instructions to send with these in an order that covers using that gear to help install the tweeters. We do include our technical support's toll free phone number on the order invoice and they can help guide you through the installation!
jason  Dec 14, 2022 (Staff)
Q
how do i remove pilar on hummer h3?
chris  Nov 29, 2022
1 answer
A
Greetings Chris, and thank you for your question. We send along panel removal instructions after your order ships. Those come free via email after your purchase. If you need those instructions before you order the replacement speakers, contact our advisor team at 800-324-9695, and we can sell you those at $9.99, and when you come back and purchase the speakers and or stereo, we credit you back for those instructions. hope your day goes well.
hogan  Nov 29, 2022 (Staff)

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