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Technical Description
Jamo SUB 250, 300, 550, 650
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General Description With this dedicated subwoofer line up from Jamo we wanted to achieve several goals. We wanted a subwoofer line up with the best ever performance per $ and we wanted it to be able to match a variety of different speaker solutions on the market, including Jamo of course. Making a dedicated subwoofer line up, instead of making designated subwoofers to a specific speaker series creates e few challenges. One challenges being to create a design and performance capable
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Because of the flat frequency response all the way to 150Hz, SUB 250 is the ideal match for small satellite speakers, since it allows you to integrate it seamlessly without missing Picture 1 the important middle bass area. Many subwoofers fall of very drastically above 100Hz (or some even under, see picture 2) making them very hard to integrate with small speakers. Of course the SUB 250 is also well suited for use together with bookshelf or floorstanding speakers when there is a need
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Since SUB 550 reaches very low, it features a Boundary Gain Compensation switch, which further helps to keep a flat frequency response, as BGC compensates for the room influence at low frequencies. The level control is placed on the front of the subwoofer, elegantly integrated in the design, with a soft blue light indicating the volume setting. SUB 650 The SUB 650 incorporates a 12” subwoofer driver and an amplifier capable of producing 650 Watts of peak power. This subwoofer works in
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Electronics The important things on subwoofer amplifiers are the ability to deliver high power – especially peak burst are important to reproduce e.g. an explosion or a bass drum with full fidelity. This has to be done with a minimum of distortion and a very tight control of the woofer. Due to the nature of a normal class AB amplifier we would need to have a very big power supply since only approx 60% of the power is turned into sound – the rest is turned into heat. Consequently the heats
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Most of today’s subwoofers have an auto on/standby feature whereby the subwoofer switches itself on if it senses a signal and switches in standby mode again a certain time after it has last sensed a signal. However, in movies (or typically classical music) with relatively quiet passages the subwoofer can switch to standby mode thereby “missing” the start of a new action packed sequence like for example an explosion or a kettledrum. Besides the auto on/standby mode we have therefore impleme
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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
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In normal setup, the port is radiating towards the rear wall, giving an even higher efficiency at very low frequencies.
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Technical Specifications SUB 250 SUB 300 SUB 550 SUB 650 Speaker name Slotted Bass reflex Slotted Bass Slotted Bass Closed Cabinet System Port reflex Port reflex Port 8” down firing 10” down firing 10” down firing 12” front firing Woofer 250 300 550 650 Peak power [W] 30-150 +3dB 28-150 +3dB 26-150 +3dB 24-150 +3dB Frequency range [Hz] Impedance [Ohm] 22 kOhm 22 kOhm 22 kOhm 22 kOhm No no no yes 12 V trigger Phase Yes, variable Yes, variable Yes, variable Yes,
