Russell K Red 150SE Floorstanding Loudspeaker

How do you improve on a loudspeaker design that is already heralded as sounding fast, natural and controlled?  Enter the Russell K. Red 150SE, which further raises the performance benchmark of the Red 150 to a higher standard.

The Russell K Red 150SE floorstanding loudspeaker exhibits exemplary coherence and produces even more true-to-life dynamic nuance and detail. The sound signature of the Red 150SE is highly engaging and vivid, but without being bright and overpowering. And because the special edition of the 150 delivers that bit more in micro-detail, we can hear the true relationship between musical events and their time-base. One can also remark at the excellent quality of 150SE’s fast and rhythmic deep bass.

Designed and Manufactured in the UK

Red 150SE technical updates vs Standard Red 150

New upgraded tweeter with metal faceplate
The new tweeter may look similar to the standard Red 150 HF unit, however its build and sound quality is much superior. There is a sense of more detail in the music, but without sounding brighter. The biggest benefit of this new tweeter, is its ability to play complex music and difficult recordings without sounding harsh or fatiguing.‏‏‎

New tweeter crossover design
The new tweeter has a higher output, so an adjustment was necessary to the shape of the response curve to match the output of the bass/mid driver. At the same time this gave an opportunity to fine tune the speaker to sound even more realistic, all without changing the excellent phase response so important for music to time well.

New sub bass coil
A bigger coil, both in value and built with a larger frame and thicker wire. The result is a speaker that is both easier to place in the listening room as well as having a more tuneful bass reproduction. This completes the picture by adding more drama to the bass while maintaining the significant bass extension of the standard Red 150.

New Titanium screws
Surely screws are just screws? Well, in a speaker, screws are an important part of the interface between drive units and the cabinet. Experimentation has proved that the many advantages titanium has over steel are particularly useful in loudspeakers. Titanium has excellent anti-damping properties, low density, high tensile strength, low modulus of elasticity, good heat transfer, and is non-magnetic.‏‏‎

New plinth and spikes
The interface between the floor of the listening room and the cabinet of a loudspeaker is critical to it’s real world performance. Especially with so many variations in floor finish – from wood to carpet to concrete and everything in between. Adding an extra 3rd level to the double plinth system of the standard 150 creates a sophisticated triple plinth of differing materials which means the isolation from the floor is significantly improved. Improved spikes are the icing on the cake. Bass performance is an obvious beneficiary but soundstage, coherence and dynamics are also enhanced.‎

‎*Other Red 150SE specifications are the same as the Red 150.

Cabinet

Dimensions H- 950mm (1000mm including plinth, base and spikes) W-240mm D-250mm
Construction 16mm MDF all sides apart from front baffle which is 19mm.
Totally undamped cabinet
3 acoustic loading bracing shelves with multiple apertures, mounted below the tweeter, below the bass mid driver and below the sub bass driver
1 bracing shelf mounted near the bottom of the enclosure containing an internal port
Internal port vents into a small chamber containing 2 asymmetric length reflex ports tuned as a system to 21Hz

Drive Units

2 x 6.5” Bass units with impregnated paper cone and curved optimised acoustic profile
High power Ferrite magnet driving a 25mm voice coil with aluminium former and Faraday distortion cancelling copper ring
25mm soft dome tweeter
Double Ferrite magnet system
Copper Clad Aluminium voice coil wire on a Fibreglass Former and Faraday distortion cancelling copper ring

Crossover

All drivers connected in positive phase
Sub bass driver starts roll off at 80Hz 6db/Oct fed by “Enclosed Field Iron Core Inductor”. Features high power without saturation, very low DCR and almost no stray magnetic field
Bass/Mid driver crossover frequency 2200Hz nominal 12 db/Oct. Utilises an “Enclosed Field Ferrite Core Inductor “in the signal path. Very low DCR nominal stray fields
Tweeter attenuation by misaligned Zobel network as opposed to conventional L-Pad
All Drivers have only one component in the signal path
Phase optimised through the crossover region
In room usable frequency response 20Hz-22KHz (dependent on room)

Sensitivity: 87db 1 watt 1 Metre