Castle Knight 4 is a 2-way Passive Transmission Line Floor-standing speaker by Castle. It was released in May 2010. It features a 1" Soft-Dome Tweeter and 2 x 5" Natural Fibre Woofer.
A 2.5-way floorstander: two 130 mm natural fibre cones (one bass, one bass/mid) and a 25 mm textile dome, TPT quarter-wave loading. 90 dB (1 W/1 m), 8 ohms, 25-150 W, nominal 36 Hz-24 kHz. Launched in 2010 at GBP 799.95 a pair; now in Castle's archive.
The speaker has a frequency range of 36-24k Hz and a sensitivity of 90 dB.
Room Size Suitability
The size of the room where you plan to use the Castle Knight 4 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 | Average |
| Mid-size Room | Good |
| Large Room | Average |
| Very Large Room | Poor |
(* 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.)
Castle's Knight Series of Loudspeakers
Knight 4 is a member of Castle's Knight series of Passive speakers. Below you can see the main specs of these speakers.
See all 5 Castle Knight models compared »
Castle Knight Series Speakers
Frequency Response of the Castle Knight 4 Speaker
Castle Knight 4 has a Frequency response range of 36-24k Hz and Power Range of 25-150 watts. With a minimum frequency of 36 Hz, Knight 4 delivers deep bass that will likely satisfy most listeners, especially those who enjoy music. However, movie enthusiasts and music fans who prefer a full range of sound may still benefit from adding a subwoofer.
Here we have a comparison of how Knight 4's Low frequency value compares with the average, max and min Low frequency values in its class.
Low Frequency
Floor-standing Speakers
Thinking about a subwoofer for the Castle Knight 4?
Crossover frequency of the Castle Knight 4?
The crossover frequency of the Knight 4 is set to 3 kHz. This is the threshold frequency where the higher frequency signals over this level are sent to the tweeter and the lower-frequency signals are sent to the woofer by the crossover component.
Impedance and Sensitivity
Castle Knight 4's nominal impedance level is
8 ohms and has a sensitivity of
90 dB.
Sensitivity
Floor-standing Speakers
8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so Castle Knight 4 is not considered a difficult to drive speaker from nominal Impedance perspective.
Sensitivity
90dB of the Castle Knight 4 is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise. Work out how loud the Castle Knight 4 plays in your room →
What amplifier does the Castle Knight 4 need?
At normal listening levels in a medium room, about
7.5–120 W
per channel into 8 ohms.
Set your own conditions and we will rank every amplifier we cover.
Prefer to browse? See every integrated amplifier we cover.
Input Type
Knight 4 features Binding post type connectors.
Work out what gauge speaker cable this run needs →
Castle Knight 4 External Dimensions and Weight
Castle Knight 4 has external dimensions of (Height x Width x Depth) 35-7/16 x 6-1/2 x 10-5/8inch (900.0 x 165.0 x 270.0mm ).
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 Castle Knight 4 is approximately 445.5cm2 / 69.1inch2.
Find speakers that fit your shelf or alcove → · Work out where they should sit in the room →
WeightThe Castle Knight 4 weighs 12.50kg / 27.5lbs per piece. Here is a comparison of how Knight 4's weight compares with the average, max and min weights in its class.
Weight
All Floor-standing Speakers
Cabinet type and Materials
Castle Knight 4 has a
Transmission Line type cabinet and a Real wood veneer, semi-matt lacquer finish.
Recommended Accessories
Here is a list of accessories that we think you may need for the Castle Knight 4.
Official Product Page
Official manufacturer's product page for the Castle Knight 4 speaker can be found below:
Official Product Page for Castle Knight 4