Polk Audio Legend L400 is a 3-way Passive Bass Reflex Center Channel speaker by Polk Audio. It was released in 2019. Center channel speaker is an important component of a home theater system set-up as it delivers the listener significant part of the on-screen dialogue from your television. It features a 1" Pinnacle Ring Radiator Tweeter, 1 x 4" Midrange and 2 x 6.5" Woofer. The speaker has a frequency range of 55-38k Hz and a sensitivity of 87.5 dB. Polk L400 has an MSRP of 1799$ but can often be found around 1549$ per pair.
Room Size Suitability
The size of the room where you plan to use the Polk L400 is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:
| Listening Environment* |
Suitability |
| Near-field | Poor |
| Small Room | Poor |
| Mid-size Room | Good |
| Large Room | Good |
| Very Large Room | Average |
(* Approximate Room sizes: Small < 100sq. ft / 9 m2, Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: > 400 sq. ft / 36 m2.
Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual listening experience changes depending on floor height, room shape, surface materials, listening position, speaker locations, etc.)
Polk Audio's Legend L Series of Loudspeakers
L400 is a member of Polk Audio's Legend L series of Passive speakers. The Legend range is Polk Audio's flagship line, with the brand's Pinnacle tweeter and Power Port bass. Below you can see the main specs of these speakers.
See all 5 Polk Audio Legend L models compared »
Polk Audio Legend L Series Speakers
Frequency Response of the Polk L400 Speaker
Polk L400 has a Frequency response range of 55-38k Hz and Power Range of 25-300 watts.
Here we have a comparison of how L400's Low frequency value compares with the average, max and min Low frequency values in its class.
Low Frequency
Center Channel Speakers
Impedance and Sensitivity
Polk L400's nominal impedance level is
4 ohms and has a sensitivity of
87.5 dB.
Sensitivity
Center Channel Speakers
Nominal Impedance of the 4 Ohms means that the Polk Audio Legend L400 is a difficult to drive speaker from nominal Impedance perspective, make sure that you choose an amplifier than can provide 4 Ohms for this speaker.
Many AVRs (audio/video receiver) in the market may have difficulty when the speakers dip below the 4 Ohms levels (this may cause clipping or even physical damage), so we recommend to not pair the Polk Audio Legend L400 with an AVR but use an Integrated Amplifier instead.
Sensitivity
88dB of the Polk Audio Legend L400 is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise. Work out how loud the Polk L400 plays in your room →
Running more than one pair from a single amplifier? Check the load it would present →
What amplifier does the Polk L400 need?
At normal listening levels in a medium room, about
24–300 W
per channel into 4 ohms.
Set your own conditions and we will rank every amplifier we cover.
Prefer to browse? Integrated amplifiers under $2,000, or every amplifier we cover.
Input Type
L400 features Binding post type connectors.
Work out what gauge speaker cable this run needs →
Polk L400 Back View
Polk L400's Binding post terminals
Polk L400 External Dimensions and Weight
Polk L400 has external dimensions of (Height x Width x Depth) 9-5/8 x 26-1/16 x 13-1/2inch (245.0 x 662.0 x 343.0mm ).
Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited.
The base area of Polk L400 is approximately 2270.7cm2 / 352.0inch2.
Find speakers that fit your shelf or alcove →
WeightThe Polk L400 weighs 18.55kg / 40.8lbs per piece. Here is a comparison of how L400's weight compares with the average, max and min weights in its class.
Weight
All Center Channel Speakers
Weight
Center Channel Speakers under $2000
Polk L400 - Top View
Cabinet type and Materials
Polk L400 has a
Bass Reflex type cabinet. Bass Reflex type loudspeakers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs.
Port Position
Polk L400 is a rear-firing port speaker so you have to make sure you leave enough space between the back of the speaker and wall or bookshelf so that it has room to breathe.
Polk L400 Port
Available colors
Polk L400 is available in Black and Walnut.
Does the Polk L400 come with a Grille?
L400 comes with magnetic grilles. The purpose of the grille is to protect the delicate driver elements from external impacts while still allowing the sound to pass as clearly as possible. Since the included grille of the L400 is magnetic type, it is very easy to put it on and off.
Polk L400 with Grille
What's in the Box of Polk L400?
Here are the items that are included inside the box of L400:
- Center-channel loudspeaker
- Grille
- 2 Jumper-wires
- Cleaning cloth
- Owners Manual
- Online Registration
Recommended Accessories
Here is a list of accessories that we think you may need for the Polk Audio Legend L400.
Warranty
5 Years of parts warranty and 5 Years of labor warranty is generally provided by the manufacturer.