Castle Windsor Duke is a 2-way Passive Bass Reflex Bookshelf speaker by Castle. It was released in March 2023. It features a 1.1" Soft-Dome Tweeter and 1 x 8" Woven Polypropylene Woofer.
A large 2-way standmount: 200 mm woven polypropylene bass/mid and a 28 mm micro-fibre dome, rear port, 26 litres. 90 dB at 2.83 V, 8 ohm compatible with a 4.2 ohm minimum, 30-150 W. 52 Hz-22 kHz +/-3 dB, 39 Hz at -6 dB. Built in the UK; sold with matching stands, and the US price includes them.
The speaker has a frequency range of 52-22k Hz and a sensitivity of 90 dB. Castle Windsor Duke has an MSRP of 6250$ per pair.
Room Size Suitability
The size of the room where you plan to use the Castle Windsor Duke 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 Windsor Series of Loudspeakers
Windsor Duke is a member of Castle's Windsor series of Passive speakers. Below you can see the main specs of these speakers.
Castle Windsor Series Speakers
Frequency Response of the Castle Windsor Duke Speaker
Castle Windsor Duke has a Frequency response range of 52-22k Hz and Power Range of 30-150 watts. With a minimum frequency of 52 Hz, Windsor Duke delivers moderate bass depth so depending on your use case, you might want to consider adding a subwoofer to your system.
Here we have a comparison of how Windsor Duke's Low frequency value compares with the average, max and min Low frequency values in its class.
Low Frequency
Bookshelf Speakers
Thinking about a subwoofer for the Castle Windsor Duke?
Among the speakers in our database priced under $10,000 a pair, these are the 3 Passive Bookshelf speakers that have deeper bass than the Castle Windsor Duke's 52Hz:
Crossover frequency of the Castle Windsor Duke?
The crossover frequency of the Windsor Duke is set to 2.1 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 Windsor Duke's nominal impedance level is
8 ohms but can go down to as low as
4.2 ohms, and has a sensitivity of
90 dB.
Sensitivity
Bookshelf Speakers
8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so Castle Windsor Duke is not considered a difficult to drive speaker from nominal Impedance perspective.
Sensitivity
90dB of the Castle Windsor Duke is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise. Work out how loud the Castle Windsor Duke plays in your room →
Minimum Impedance of the Castle Windsor Duke
Even though the nominal impedance of the Windsor Duke is 8 ohms, the minimum impedance level of this speaker according to Castle is 4.2 ohms Castle Windsor Duke so while choosing an amplifier, you should ideally check if the unit you are considering can provide this impedance level.
What amplifier does the Castle Windsor Duke need?
At normal listening levels in a medium room, about
7.5–120 W
per channel into 8 ohms.
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Prefer to browse? See every integrated amplifier we cover.
Input Type
Windsor Duke features Binding post type connectors.
Work out what gauge speaker cable this run needs →
Castle Windsor Duke External Dimensions and Weight
Castle Windsor Duke has external dimensions of (Height x Width x Depth) 18-1/2 x 11 x 12-3/16inch (470.0 x 280.0 x 310.0mm ).
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 Windsor Duke is approximately 868.0cm2 / 134.5inch2.
Find speakers that fit your shelf or alcove → · Work out where they should sit in the room →
Cabinet type and Materials
Castle Windsor Duke has a
Bass Reflex type cabinet and a Walnut veneer, Mahogany veneer finish. 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
Castle Windsor Duke 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.
Wall Mounting
Windsor Duke doesn't sport any built-in mounting bracket, so you need an external structure to mount it on walls.
Recommended Accessories
Here is a list of accessories that we think you may need for the Castle Windsor Duke.
- Speaker Cable and Connectors
- Vibration Isolators: IsoAcoustics isolators are our favorite isolators but you may find more affordable options too.
- Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.
- Speaker Stands: Stands bring your bookshelf speakers to ideal height (rule of thumb is to have the tweeter level with your ear in your listening position), helps stability and acoustical isolation.
Official Product Page
Official manufacturer's product page for the Castle Windsor Duke speaker can be found below:
Official Product Page for Castle Windsor Duke