Infinity 612m Boat-Marine Speaker Review

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  • nominal power: 75 watts (per set)
  • peak power: 225 watts
  • impedance: 4 ohms
  • sensitivity: 89 dB/W/m
  • frequency response range: 50 – 20,000 Hz
  • unit weight: 5.6 lbs
  • unit dimensions: 7.08 x 7.08 x 3.5 inches
  • warranty: 1 year (POSSIBLY DOES NOT APPLY to purchase)
  • user manual: click here
  • wireless: no
  • battery life: n/a
  • signal range: n/a

Infinity is a well known brand that operates under Harman International that currently has three main products in it’s marine speaker line. The Infinity 612m is a 6.5 inch diameter 2 way coaxial loudspeaker driver unit intended for panel mounting. Infinity provides the electro-mechanical parameters for 612m which can be used to properly tweak the space where 612m will be mounted so that it sounds best. For example, you can adjust the bass response by adding mineral wool to the cabinet. The speaker is designed to be fully water proof, salt water included, as well as to be UV resistant, so you can confidently install them into your boat permanently and not worry about them failing. Keep on reading for our full Infinity 612m Review. You can read more about our rating system here.

Power: 9/10 – with a nominal power of 75 watts and an 89 sensitivity rating, this speaker set is more than enough to truly blast loud music on even a larger sized boat. And with a frequency response range of 50 – 20,000 Hz, you’ll be sure to get a decent sounding full bass that such a low bottom range provides, which is particularly important when outdoors.

Aesthetics & Style: 3/5 – The 612m only comes in a single style, and kind of has an overly loud and cheap look to it that might clash with the colors on your boat. However, if all you care about is quality of sound then who cares.

Portability & Convenience: 4/5 – At 5.6 pounds and 7.08 x 7.08 x 3.5 inches each, the unit shouldn’t be too hard to move around and get into place. One important consideration with panel mounting driver units are the mounting dimensions because they will need to fit in the loudspeaker cutout. The 612m diameter is fairly standard at 5 & 1/16 inches. The other even more important consideration is the panel depth. Loudspeakers need a little air behind the panel on which they are mounted to properly project sound. These marine speakers have a depth of 2 & 5/8 inches. While not exactly on the shallow side, they will usually not pose any problems with most panels. The positive and negative electrical terminals are also different sizes which makes installation virtually fool proof, even for a nontechnical person.

Durability: 4/5 – What these speakers may lack in looks they more than make up for in durability. The grille is stainless steal and the cone is polypropylene, and completely seals the front of the unit, protecting the internal components from UV light & water. It’s graded as being fully water resistant, salt water included. the only slight weakness is that the grill structure leaves the cone a little open and vulnerable.

Warranty: 3/5 – All Infinity marine speakers come with a one year warranty, which is a little on the short side compared to other speaker product warranties, but it’s nice to still have basic protection against a defective unit.

Price: 9.5/10 – These speakers are currently heavily discounted on, and bring great power and quality to the table for under $100 for the set.

Bottom Line: 8.3/10

The Infinity 612m is a high quality set of marine speakers at an excellent price, bottom line. It’s not surprising that they’re the top seller on

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NOTE: These require separately sold speaker wire. Need some? Check out our outdoor speaker wire guide here.