Phil Jones Double 4 70 Watt Micro Combo 2x4", BG-75 Only 9 lbs!

DOUBLE FOUR (BG-75)
Professional Miniature Practice Bass Amp

The DOUBLE FOUR is the pinnacle of micro bass amps. With new driverdesign, acoustic loading and the latest digital amplifier technology,this tiny bass combo may be designed as a practice amp but continues toamaze everyone with the great PJB signature bass tone. From a cabinetwith the size of a jewel box, this seems to defy the laws of physics.

Driver and Amplifier Technologies

Driver and Amplifier Technologies Pushing our expertise of usingsmaller drivers to get the ultimate bass sound, we applied our vastexperience to an even smaller, œNeo Power 4 inch driver built withprecision of a Swiss watch. This 4 baby is able to cope with theextreme signals coming in from an amplified bass guitar. By using ourextensive R&D facility which includes the largest anechoic chamberin the bass guitar amplifier industry, and the KLIPPEL transducermeasurement system, we were able to develop the perfect 4 inchtransducer for our purpose. We analyzed the neodymium magnetic system,the cone behaviors at all frequencies in 3D representation, conesuspension and frame, until we achieved our goal. We then looked at theacoustic loading using the acoustic simulation software and calculatedexactly the full power cone displacement at every frequency.

Each one of these 4 speaker is fed with its own PulseWidth Modulation PWM amplifier. PWM amplifiers are extremely efficientcompared to the traditional analog solid state amplifiers, convertingelectrical energy to power using on the speakers instead of wasting iton hot. Since the amp is running at lower working temperature, theDOUBLE FOUR will give years of service long after other amps have fadedaway. By using dual amplifiers one for each speaker, the bass control isgreatly improved since the damping factor ( the amplifier's ability toput on the œbrakes to stop the speaker cone from overshoot ) isdoubled. The end result? A bass tone that is well controlled, punchy,tight and never muddy or bloomy.

Enclosure Technology To maximize its tiny cabinet enclosure, we designed a customRectangular Auxiliary Low Frequency Radiator (RALFR ). RALFR is apneumatically coupled radiator loaded to the rear of the two 4 inchspeakers that operates at the lowest bass frequencies only. It augmentsthe output of the loudspeakers at frequencies from 30 to 150 Hz. It alsoreduces the cone excursion of the speakers, so power handling isgreatly improved. The cabinet is also heavily braced internally andlined with acoustic damping materials. This damping prevents cabinetcoloration that can interfere with the true sound of your instrument.Now, what you hear from the DOUBLE FOUR is the most realisticamplification of your instrument.

• Model     Double Four / BG-75
• Power Output     70 Watt (RMS)
• Speaker     2 x PJB NeoPower, 4 inch speakers. Rectangular Auxiliary Low Frequency Radiator (RALFR ) Switch able high gain input OR low gain stage with mute function
• EQ     3-Band EQ (Treble, Mid, Bass)
• Input     AUX-Input Jack,?DC-Power Input Socket
• Output     Line-Out, Headphone-Out
• Other     Power Switch
• Power     100/240V AC
• Dimension (W x D x H)     11 x 8 x 6.8 inch / 280 x 203 x 172 mm
• Weight     8.8 lbs / 4 Kg