Jamo SUB 250 Technical Overview - Page 7

In/Outputs All the subwoofers features speaker level inputs if there is lack of a line level/LFE level output on the amplifier/receiver. All subwoofers also have both left and right line level input in case of stereo sources and a loop through capability, i.e case the signal needs to be routed through to a second subwoofer. The SUB 650 also features a 12V trigger, allowing it to be turned on automatically together with the receiver/controller if the receiver/controller has the presence of such an output. Drivers The drivers used throughout the sub series are constructed with heavy magnet systems , long VCs and very stiff paper membranes. This enables a very fast attack and a high degree of control. Sub 250 For the SUB 250 the woofer is an 8" driver with an Ø 38mm 4-layer voice coil with an X-max at +/-10mm allowing for high excursions. The heavy magnet system features a vented pole piece in order to avoid over/under pressure behind the dust cap (mechanical damping) when the cone is moving. Sub 450 & 550 For the SUB 450 & 550 a 10" driver is chosen. The driver features an Ø 38mm 4-layer voice coil with an X-max at +/-15mm allowing for high excursions. The heavy magnet system features a vented pole piece in order to avoid over/under pressure behind the dust cap (mechanical damping) when the cone is moving. Sub 650 For the SUB 650 a 12" driver is chosen . The driver features an Ø 50mm, 4-layer voice coil with an X-max at +/- 18mm allowing for high excursions. The heavy magnet system features a vented pole piece in order to avoid over/under pressure behind the dust cap (mechanical damping) when the cone is moving. Cabinets All subwoofer cabinets are made of heavy MDF board, a solid and resonance dead base for the drivers to work in. However, the Slotted Bass reflex Port is probably the most remarkable feature of the SUB 250, 450 and 550 cabinets. The slotted port is an integral part of the construction, which braces the surfaces, making the overall construction extremely rigid. The Slotted Bass reflex Port is very long allowing a low tuning frequency together with a large radiating area compared to a conventional round port, giving a high efficiency and low distortion.