Castle Walmer 1 is a 2-way Passive Bass Reflex Bookshelf speaker by Castle. It was released in September 2026. It features a 0.47x1.77" True Ribbon Tweeter and 1 x 5" Woven Carbon Fibre Woofer.
A 2-way standmount: one 130 mm woven carbon fibre bass/mid cone and a 12 x 45 mm true ribbon tweeter (the diaphragm is driven directly, not a folded AMT). Rear reflex port, 9.5 litres. 86 dB at 2.83 V, 8 ohm compatible with a 4.3 ohm minimum, 25-100 W. 55 Hz-20 kHz +/-3 dB, 48 Hz at -6 dB. Hand-built in the UK.
The speaker has a frequency range of 55-20k Hz and a sensitivity of 86 dB. Castle Walmer 1 has an MSRP of 3499$ per pair.
Room Size Suitability
The size of the room where you plan to use the Castle Walmer 1 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 | Average |
| Small Room | Good |
| Mid-size Room | Average |
| Large Room | Poor |
| Very Large Room | Bad |
(* 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 Walmer Series of Loudspeakers
Walmer 1 is a member of Castle's Walmer series of Passive speakers. Below you can see the main specs of these speakers.
Castle Walmer Series Speakers
Frequency Response of the Castle Walmer 1 Speaker
Castle Walmer 1 has a Frequency response range of 55-20k Hz and Power Range of 25-100 watts. With a minimum frequency of 55 Hz, Walmer 1 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 Walmer 1'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 Walmer 1?
Among the speakers in our database priced under $5,000 a pair, these are the 5 Passive Bookshelf speakers that have deeper bass than the Castle Walmer 1's 55Hz:
Crossover frequency of the Castle Walmer 1?
The crossover frequency of the Walmer 1 is set to 2.8 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 Walmer 1's nominal impedance level is
8 ohms but can go down to as low as
4.3 ohms, and has a sensitivity of
86 dB.
Sensitivity
Bookshelf Speakers
8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so Castle Walmer 1 is not considered a difficult to drive speaker from nominal Impedance perspective.
Sensitivity
With a sensitivity level of only 86 dB, Castle Walmer 1 is a difficult to drive speaker from Sensitivity perspective, make sure to choose an amplifier with a high output if you like listening to your music at high volume levels. You may especially have a hard time using Tube amplifiers which are traditionally very low power compared to Class A/B or Class D amps. Work out how loud the Castle Walmer 1 plays in your room →
Minimum Impedance of the Castle Walmer 1
Even though the nominal impedance of the Walmer 1 is 8 ohms, the minimum impedance level of this speaker according to Castle is 4.3 ohms Castle Walmer 1 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 Walmer 1 need?
At normal listening levels in a medium room, about
19–100 W
per channel into 8 ohms.
Set your own conditions and we will rank every amplifier we cover.
Prefer to browse? Integrated amplifiers under $5,000, or every amplifier we cover.
Input Type
Walmer 1 features Binding post type connectors.
Work out what gauge speaker cable this run needs →
Castle Walmer 1 External Dimensions and Weight
Castle Walmer 1 has external dimensions of (Height x Width x Depth) 13-1/8 x 8-1/4 x 8-11/16inch (334.0 x 210.0 x 220.0mm ).
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 Walmer 1 is approximately 462.0cm2 / 71.6inch2.
Find speakers that fit your shelf or alcove → · Work out where they should sit in the room →
WeightThe Castle Walmer 1 weighs 7.50kg / 16.5lbs per piece. Here is a comparison of how Walmer 1's weight compares with the average, max and min weights in its class.
Weight
All Bookshelf Speakers
Weight
Bookshelf Speakers under $5,000
Cabinet type and Materials
Castle Walmer 1 has a
Bass Reflex type cabinet and a Walnut veneer, Black Oak 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 Walmer 1 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
Walmer 1 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 Walmer 1.
- 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 Walmer 1 speaker can be found below:
Official Product Page for Castle Walmer 1