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INFINITY SPEAKERS PRIMUS 603F
MRP: ₹7,990.00 Offer Price: ₹5,599.00
Infinity Primus 603F delivers powerful, clear sound with Plus One™ woofer cones and silk dome tweeters for rich bass and smooth highs. A perfect 6.5″ upgrade for crystal-clear, distortion-free audio performance.
Description
Key Features
These are some of what Infinity emphasizes in this model: Harman Audio+2Creative Audio+2
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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
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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
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Vented basket / frame design — helps with cooling the voice coil under higher power, reducing distortion when pushed. Harman Audio+1
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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
Technical Specifications
Here are the measurable specs: Creative Audio+3Crutchfield+3Sonic Electronix+3
| 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 |
What It Means in Practice / Performance
Here’s what to expect if you use the Primus 603F in a car audio system:
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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.
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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.
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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.
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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.
Strengths & Trade-Offs
Strengths
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Good build quality for the price. Audio Express+1
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High sensitivity and low impedance helps squeeze more from weaker amplifier/head unit sources.
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Compact depth helps installation in tight spaces without modifications.
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Nice “bang for buck” — pretty well-rounded performance at a moderate price.
Trade-Offs / Things to Be Aware Of
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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.
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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.
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Peak power ratings (150 W) are short bursts; sustained high volumes can cause distortion or wear if pushed without good power and cooling.
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Because of limited mounting depth, may have compromises in cone excursion; more deep bass means more movement, which needs room.
3 reviews for INFINITY SPEAKERS PRIMUS 603F
INFINITY SPEAKERS PRIMUS 603F
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MRP:₹18,490.00Offer Price: ₹12,949.00 Add to cart Quick View
“Solid build with polypropylene woofers—feels premium, not just another bottom-line budget speaker.”
“Installation was quick in my car’s door and they fit perfectly—immediately better sound.”
“Great value for money—high-quality sound that competes with premium brands.”