INFINITY SPEAKERS PRIMUS 603F

Name: INFINITY SPEAKERS PRIMUS 603F
Brand: CARMORE
SKU: INF08
Price: 95.88 INR
Availability: InStock
Rating: 5.00 (3 reviews)

Description

These are some of what Infinity emphasizes in this model: Harman Audio+2Creative Audio+2

Plus One™ woofer cone architecture — this is Infinity’s (Harman’s) larger cone area design which gives more cone surface area in the same nominal size, for more bass output and better sensitivity. Harman Audio+1
Edge-driven silk dome tweeter — the tweeter is a silk dome, edge-driven, meant to give smooth, detailed high frequencies without harshness. Creative Audio+1
Vented basket / frame design — helps with cooling the voice coil under higher power, reducing distortion when pushed. Harman Audio+1
Compact design / engineered for fitment — shaped so it can fit in many factory speaker locations without big modifications. Lower mounting depth helps. Harman Audio+1

Parameter	Value
Speaker Type	6.5″ (6-1/2″) coaxial 2-way car speakers (pair) Sonic Electronix+2Crutchfield+2
Woofer Material	Polypropylene cone Audio Express+2Creative Audio+2
Woofer Surround	Rubber (hi-roll rubber) Crutchfield+1
Tweeter Type	½-inch silk dome, edge-driven Crutchfield+2Creative Audio+2
Impedance	3 Ω nominal Crutchfield+1
Sensitivity	About 92 dB (2.83 V @ 1 m) Crutchfield+1
Frequency Response	~ 55 Hz – 20,000 Hz (-6 dB points) Crutchfield+2Creative Audio+2
Power Handling (RMS)	50 watts per speaker (100 W per pair) Sonic Electronix+2Audio Express+2
Peak Power	150 watts per speaker (300 W pair) Sonic Electronix+2Audio Express+2
Mounting / Depth / Cut-out	Top mount depth ~ 1-5/16″ Sonic Electronix+1; cut-out diameter ~ 5″ Sonic Electronix+1

Here’s what to expect if you use the Primus 603F in a car audio system:

Better bass than many stock speakers: Because of the Plus One cone (more surface area) and relatively high sensitivity (92 dB), they will often give a noticeable improvement especially in the mid-bass range.
Needs decent power: With 50 W RMS handling and 3 Ω impedance, to get close to their potential you’ll likely benefit from a good head unit or ideally an amplifier; stock (weak) head units may under-drive them, especially in dynamic passages.
Good clarity in mids and highs: The silk dome tweeter tends to be smoother and less harsh than metal domes; good for vocals, instruments, and general listening, especially for everyday music.
Lower frequency limit: 55 Hz is decent but won’t go very deep; bass below that needs to be handled by a subwoofer if you want full range.

Good build quality for the price. Audio Express+1
High sensitivity and low impedance helps squeeze more from weaker amplifier/head unit sources.
Compact depth helps installation in tight spaces without modifications.
Nice “bang for buck” — pretty well-rounded performance at a moderate price.

The 3-Ω impedance is good for getting more power, but some amplifiers may not be stable or fully rated at lower impedance; check what your amp can drive.
The lower bass (below ~55 Hz) will be weak; if your system demands deep bass (e.g. EDM, sub-heavy genres), you’ll want a subwoofer.
Peak power ratings (150 W) are short bursts; sustained high volumes can cause distortion or wear if pushed without good power and cooling.
Because of limited mounting depth, may have compromises in cone excursion; more deep bass means more movement, which needs room.

5.0 Rating

1-3 of 3 reviews

shanthi

October 21, 2025

“Solid build with polypropylene woofers—feels premium, not just another bottom-line budget speaker.”
durga

October 21, 2025

“Installation was quick in my car’s door and they fit perfectly—immediately better sound.”
naga

October 15, 2025

“Great value for money—high-quality sound that competes with premium brands.”