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The Duke of Earl? Castle’s Windsor Series Loudspeakers Will Be Made In the UK

IAG has turned the switch back on for Castle Acoustics with the new Windsor series loudspeakers. Both models will be made in the UK.

Castle Windsor Duke Loudspeakers Lifestyle

Castle is back. The loudspeaker manufacturer. Not Frank. Sorry Punisher fans.

British-based Castle Acoustics became a part of IAG (International Audio Group) after its acquisition in 2007 with the goal of maintaining its position as a leading Hi-Fi brand in the international market as well as continuing its innovative engineering and craftsmanship.

Tip: Other IAG Brands we have reported on include Wharfedale, Mission, and Audiolab.

For 2023, Castle has announced its latest speaker line, the Windsor Series. The speakers have been designed by Karl-Heinz Fink and the Fink Audio team and are being manufactured in IAG’s 9000-square-foot production facility in Huntingdon, England. Let’s find out what they have been up to with the Windsor Series. 

The Windsor series is comprised of two speakers, the Earl, and the Duke. 

Castle Windsor Earl Loudspeakers Front and Back
Castle Windsor Earl Speakers Front with Grill On/Off and Rear

Core Features

  • The Earl and Duke both feature a 2-way bookshelf/stand-mount design with rear-mounted ports (bass reflex) to extend low-frequency response. 
  • Dual-layer MDF (Medium Density Fiberboard) is used in cabinet construction. The two layers a separated by a thin glue-based layer that limits magnetic resonances. 
  • The mid-bass driver utilizes -a polypropylene cone and glass-fiber voice coil elements. 
Castle Windsor Bass Diagram
  • 28mm polyester Dome Tweeters with a pressure-equalized ferrite magnet system are used to optimize high-frequency response. 
  • The hand-selected, book-matched pairs of veneers (Walnut or Mahogany) are hand-finished.
  • Optional open-frame stand mounts are available for each speaker. 
Castle Windsor Duke Loudspeakers Front and Back
Castle Windsor Duke Speakers Front with Grill On/Off and Rear

Earl and Duke Comparison

Features/SpecificationsWindsor Earl Windsor Duke
Speaker TypeTwo-way stand mountTwo-way stand mount
Enclosure TypeBass reflex with rear portBass reflex with rear port
Tweeter28mm (1-inch) microfibre dome28mm (1-Iinch) microfibre dome
Mid/Bass Driver165mm (6.5-inches) woven polypropylene cone200mm (8-inches) woven polypropylene cone
Sensitivity (2.83V @ 1m)89dB90dB
Impedance8 ohms nominal; 4.3 ohms minimum8 ohms nominal; 4.2 ohms minimum
Recommended Amp Power25-100W30-150W
Frequency Response58Hz-22kHz52Hz-22kHz
Bass Extension (-6dB)45Hz39Hz
Crossover Frequency2.2kHz2.1kHz
Cabinet Volume (Liters)15.8L26L
Cabinet Dimensions (HWD-mm)430 x 240 x 260mm470 x 280 x 310mm
Cabinet Dimensions (HWD-inches)16.9 x 9.4 x 10.2 inches18.5 x 11 x 12.2 inches
Weight (kg)Not providedNot provided
Weight (lbs)Not providedNot provided
Castle Windsor Earl Loudspeaker Exploded
Castle Windsor Earl Loudspeaker Exploded

Pricing and Availability

The Castle Windsor Earl is £3850 per pair (£4250 with stands) while the Windsor Duke is £4500 (£5000 with stands). 

For International purchasers, the speakers only ship with the stands included: Windsor Earl with Stand: $5250 / AU$8000 and Duke with Stand: $6250 / AU$9250.

These are available only through Authorized Dealers in the UK and Globally.

Castle Windsor Earl Loudspeakers Front and Back on stands
Castle Windsor Earl Loudspeakers Front and Back on Stands

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1 Comment

1 Comment

  1. ORT

    March 22, 2023 at 10:52 am

    Beautiful speakers and it was nice to see and hear Gene Chandler again. Hard to believe it is well past 6 decades now…This is what music does for us. Memories are bonded to songs and then to our heart and soul. The equipment is the means to an end, especially so when as the end draws ever nearer.

    Thank you!


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