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Infinity Primus P363 Floorstanding Loudspeaker Review

by June 20, 2012
  • Product Name: Primus P363 Floorstanding Loudspeaker
  • Manufacturer: Infinity
  • Performance Rating: StarStarStarStar
  • Value Rating: StarStarStarhalf-star
  • Review Date: June 20, 2012 22:35
  • MSRP: $ 758/pair ($400/pair on sale)
  • *For your convenience, we've included a link to Amazon.com to buy this product. As an Amazon Associate, Audioholics.com benefits from qualifying purchases.
  • Frequency Response: (±3dB) 38Hz - 20kHz

  • Recommended Power Amplifier Range: 10 - 200 watts

  • Sensitivity: (2.83V @ 1m) 93dB

  • Nominal Impedance: 8 ohms

  • Crossover Frequencies: 350Hz, 3300Hz; 24dB/octave HP on tweeter

  • Low-Frequency Driver: Dual 6-1/2" (165mm) MMD®

  • Midrange Driver: 4" (100mm) MMD®

  • High-Frequency Driver: 3/4" (19mm) MMD®

  • Dimensions (H x W x D): 39-1/4" x 8-1/4" x 13"

  • Weight: 48.5 lb

  • Finish: Black Wood-Grain Enclosure


  • Impressive sound for such modest size and cost
  • Ability to play loud without distress
  • Very fluidic midrange performance


  • 4 ohm load may be challenging for modestly priced A/V receivers
  • Treble a bit forward and emphasized with some recordings
  • Plastic pins on binding posts nearly impossible to remove


Infinity P363 Introduction

Infinity has been making speakers since 1968 and is probably one of the most recognized names in the industry, especially since Harman acquired the brand. While their core business these days is car audio, they were once an esoteric high end home audio loudspeaker manufacturer. These days, Harman has refocused the brand more mainstream for big box stores and internet sales channels leaving Revel to fill in the gap for those discriminating audiophiles wanting more upscale products. The Primus series is currently the top of the line offering from Infinity. In fact, this line of product is a favorite among our forum community, as many have claimed them to be a superb value. You can check out Tom Andry's review of the Primus P162 bookshelf speaker for his thoughts.  I was curious to see how their flagship P363 tower speaker would perform so I requested a review set.  The Infinity Primus P363 is a 3-way floorstanding speaker featuring dual 6.5” MMD woofers, a dedicated 4” MMD midrange and a ¾” MMD dome tweeter.

Let’s take a tour of these speakers to see if they live up to the hype and benefit from the vast R&D Harman resources to make them a solid product offering from a brand that has built a reputation of quality for over 40 years.

About the author:
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Gene manages this organization, establishes relations with manufacturers and keeps Audioholics a well oiled machine. His goal is to educate about home theater and develop more standards in the industry to eliminate consumer confusion clouded by industry snake oil.

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Recent Forum Posts:

davidscott posts on September 13, 2018 18:19
Thanks good review and I pretty much agree having owned these since 2013 and am happy with them. Thanks again for the informative review and sorry about posting to an old thread.
Dapitas posts on July 26, 2016 10:04
Being I have a the Primus line home theater speaker setup and the 363's were on your agenda, I had to read. I agree with a lot of what was written. I took your recommendations for better insulation for the speakers. I used the mountain Mist Poly, wow I can honestly say this was the best tweek I have made to the 363's, repacked the plastic chamber for the mid-range speaker as well. The vocals and the high end cleaned up surprisingly well. Changed out the originals screws with brass ones, using 10 gauge speaker wire as per Audioholics advise, treated my room with acoustic panels (Home-made) and I am very Pleased with the results. I also did this tweek with the rest of my speakers and found that all were lacking a good packing, o_O. Using Denon 3310ci for receiver and using it in 7.1. The sub is the 312 12", with it I also found a lack of stuffing. The back wall of the sub was bare. Packed it and it has helped tighten it up. This will hold me over until I can step up to the next level, Thanks for the article and advise.
ooobbbccc posts on June 23, 2013 03:05
Are you serious these caps are glued on? Because I have similar caps at the back of my Denon 2312 and I was able to pull them off using my thumbnail.
jej826 posts on May 23, 2013 23:27
These speakers are 8ohm

Right from Infinity website.

FULL SPECSLoudspeaker Features/Specifications

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Frequency Response
38Hz - 20kHz

Nominal Impedance
8 ohms

Sensitivity (2.83V @1m)
93 dB

Crossover Frequencies
350Hz, 3,300Hz; 24dB/octave

Black wood-grain

Dimensions (H x W x D – Metric/English)
39-1/4“ x 8-1/4” x 13" (997mm x 208mm x 330mm)

Weight (Metric/English)
48.5 lb (22kg)


audio0412 posts on January 19, 2013 11:56

i read the review and from what i read, i had a pair of these for about a year..the weak link for this system is the tweeter. Though very efficient at high frequency it could use some upgrade down the road with a better unit. Any recommendations are appreciated!!!

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