AudioSmile Logo

AudioSmile LBM Paul Messenger

Little British Monitor

The LBM is a truly desktop sized speaker designed and built with only one objective - to be the highest quality minature loudspeaker possible.

Fully active, aptX Bluetooth enabled and constructed entirely from Birch plywood, the LBM is equally suited to the quality conscious recording engineer, musician or music lover.

A first step into the world of handmade audio, the LBM is built for you from solder to polish by designer Simon Ashton. This compact modern loudspeaker utilises the same high-end techniques found in more expensive models to produce a dynamic, emotive sound.




Bluetooth aptX

Bluetooth devices enabled with aptX can wirelessly stream music without any loss of sound quality. Any device with Bluetooth (even if it doesn't support aptX) can connect to the LBM and directly stream high quality audio within seconds.



Little Feet


Custom designed vibration damping stands named ‘Little Feet’ are included with the LBM. When a speaker is placed directly on a desk or shelf, energy will travel into that surface and make unwanted sound. The Little Feet stop this happening to get the best from the LBM wherever you place them.

The support plate uses Constrained Layer Damping formed of two layers of steel laminated together using a special acrylic adhesive. The plate rapidly dissipates structural energy as heat, acting as a sink for unwanted vibration.

The support plate is also de-coupled from the stand body with neoprene dampers. The weight of the speaker combined with the neoprene creates a tuned system in which energy above the natural frequency will not pass. A lot of care has gone into creating Little Feet as the perfect accessory for the LBM.

LBM Little Feet



Reviews of the LBM:

Enjoy The Music LBM Review



HiFi Critic Review


TNT-Audio Review

LBM Size Comparison
LBM Features




LBM In Room




Tweeter
18mm Aluminium Inverted Dome
Acrylic Phase Plate
Woofer
75mm Long-throw Aluminium Cone
Bass Alignment
Aerodynamic port in speaker base
Amplifiers
2x 25 watts LF Class A/B
2x 15 watts HF class A/B
Crossover
Active, 1.5KHz, 4th order acoustical
Bluetooth
CSR8645 chipset, aptX Support
Power Supply
External. Input 100-240v AC. Output 30v 3A DC.
Inputs 1x 3.5mm Stereo Jack. 1x Internal Bluetooth.
Cabinet Dimensions 
180mm x 120mm x 120mm HWD
Weight
Master 1.4Kg  /  Slave 1.2Kg










Why is the LBM Special?

The LBM is elevated above other products by the detail of it's acoustical design. Let's get stuck in and find out which areas received special attention and why they matter.

Cabinet Resonance

To ensure the listener hears only the sound of the drivers, a loudspeaker box should not resonate or vibrate. The BBC research department studied many materials and concluded that Birch plywood dissipated structural borne energy faster than any other. British loudspeakers following the BBC tradition have been recognised across the world for their clean and natural sound.

The LBM is therefore built entirely from quality Birch plywood, cut on precision machinery and assembled with traditional techniques. The cabinet properties are further improved by mapping the behaviour of the construction with an accelerometer (a device to measure vibration) and internally bracing the most critical points.


LBM Cabinet Analysis

Driver Distortion

Good drive units are where quality sound begins. Music should be reproduced without adding any noises that detract from what we want to hear. The tweeter and woofer in the LBM were chosen for their superb performance after testing many potential candidates.

The Tweeter has low distortion comparable with the best high end units, yet is able to reproduce more of the music range than most. Thanks to this the LBM remains clean and clear even when the woofer is working hard. It can also be used close-up, ideal for smaller spaces.

The extraordinary 3" woofer in the LBM can move twice as much air as other similar size drivers thanks to it's 'long throw' capability. Combined with a high quality magnet system and voice-coil the LBM woofer punches fast and tight with a minimum of distortion. The LBM also has custom made aerodynamic bass ports (mounted in the bottom of the speaker) that maximise volume level capability.

LBM Driver Testing

Amplifier Distortion

Practically every compact speaker currently uses class-D digital amplifiers. However, affordable class-D amps are not designed with sound quality in mind. Testing a number of class-D amplifiers during prototyping revealed excessive distortion that would totally negate the use of a high quality tweeter.

The LBM deserved better. Class-AB analogue amplification has been used in top of the range equipment for years and now also finds it's place in the LBM. Class-AB amplifiers need a bigger heatsink and power supply, but reward the user with significantly better sound.

Additionally, many products have small capacitors in the power supply to save cost, but this limits the dynamics and power of the sound. The LBM circuit has on-board approximately 4x the capacitance of others, providing extra power and kick when most needed.

LBM Class A/B Amplifiers

Active Crossovers

Good components mean nothing if they are not working together as a cohesive whole - this is the role of a crossover circuit. The LBM crossover and amplifier design is fully active; the same kind of crossover used in professional studio and concert loudspeakers.

Do not be confused by the difference between powered and active speakers. Many brands claim a speaker to be active when in fact it is simply powered.

A powered speaker has a basic crossover that is connected after a built-in amplifier. Any distortion in the system will spread to all the drivers. A true active loudspeaker has an advanced crossover that separates the frequency range before it is amplified, so that each driver has its own dedicated amplifier and distortion cannot spread. This is a huge advantage, resulting in the LBM playing louder and cleaner than single amplifier systems.

LBM Active Crossovers

Frequency Response

The LBM is accurate and true; a straight edge by which decisions in audio production can be reliably made. Many speakers have exaggerated bass and treble to sound more impressive than they really are, but the LBM does not need to pretend. Recordings reproduced the way they should be.

An additional feature is the boundary switch to compensate for tonal changes that occur when a speaker is placed near a large surface such as a wall or desk. This is an important feature for a speaker that is likely to be used in a range of environments.

LBM Frequency Response

Home | Products | About | Contact | Terms & Conditions