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The Castle Knight Series consists of two standmount speakers and three floorstanders. The Knight 1 and Knight 2 are both two-way standmount designs, while the floorstanding Knight 3, Knight 4 and Knight 5 incorporate Castle’s proprietary TPT (Twin Pipe Technology) bass loading system, using the internal volume of the cabinet to extend bass response.
In many loudspeaker designs, room modes are easily excited by forward- or rear-firing reflex ports, which can cause audible resonance at certain bass frequencies. Whilst this can give the impression of a powerful bass response, the resultant ‘boom’ masks other low frequencies, making bass sound slow and poorly defined. Instead, the TPT system utilises the internal volume of the cabinet to extend bass response, delivering a smooth and even result that augments the main bass driver’s output perfectly.
In many loudspeaker designs, room modes are easily excited by forward- or rear-firing reflex ports, which can cause audible resonance at certain bass frequencies. Whilst this can give the impression of a powerful bass response, the resultant ‘boom’ masks other low frequencies, making bass sound slow and poorly defined. Instead, the TPT system utilises the internal volume of the cabinet to extend bass response, delivering a smooth and even result that augments the main bass driver’s output perfectly.
TPT couples the rear output of the bass drive unit to the air in the room via a column of air in the cabinet. This column is tuned to optimise the output of the bass unit at low frequencies in the same way that the air columns in a pipe organ transfer energy efficiently, so the listener feels, as well as hears, the low frequency output. TP or The ‘Twin Pipe’ refers to the internal layout where the drive unit is positioned part way down a folded, tapered column. This exits through the base of the cabinet and is mass loaded by the air trapped between this ‘port’ and the plinth.
The result is deep, tuneful, well-defined bass from speakers that are easily accommodated in a wide variety of room shapes and sizes.
This means they are able to perform as a perfect piston at sufficient speeds to track even the most complex of musical scores. The random nature of the grain contributes to an exceptionally inert diaphragm that is free from the resonances and ‘ringing’ of cones fashioned from lesser materials.
All four speakers couple a 25mm textile dome tweeter with an innovative aluminium-core voice coil, delivering a performance that matches or even exceeds the bandwidth possible from metal dome tweeters, whilst avoiding their inherent problems.
Castle Acoustics has been a loudspeaker manufacturer in the truest possible sense since 1973, with both design and manufacture of their world-famous speakers housed entirely in one factory.
