Thule Audio IA-252-B Brochure

May 2005: Exciting new amplifiers from Thule Audio

Thule Audio will shortly be launching two new amplifiers, Spirit IA252B and Space IA255B, containing many technological and aesthetical improvements.

Spirit IA252B

Spirit IA252B utilizes Thule’s “high efficiency” technology, which

Spirit IA252BSpirit IA252B reduces the heat generation by up to 60%, compared with standard class AB amplifiers. This means that the amplifier is elegantly compact and will fit into any living room, in spite of its massive 2x 250W (8ohm) output.

IA252B is build with a fully balanced signal path, which consists of two identical amplifier circuits that operate fluidly in relation to ground paths and power supply. Among other things, this effective removes all noise generated by the power supply. A fully balanced signal path from disc player to speaker terminals can be achieved, If IA252B is connected with XLR cables to a balanced disc player, such as Thule’s DVA150B.

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Thule’s unique “Virtual Class A output transistors in such a way that both the positive and the negative output transistors are active at all times. This eliminates the annoying crossover distortion that develops in standard class AB amplifiers, when the positive and negative output transistors constantly switch on and off.

The combination of “Virtual Class A a diesel engine and a turbo charger, in the sense that both bring out the best in each other: “Virtual

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Class A

eliminates the “asymmetrical” crossover distortion whereas the balanced signal path eliminates the “symmetrical” distortion. The end result is an incomparably low distortion of less than 0.005% at 300W (4 ohm)!

The signal path is without global feedback, which could otherwise cause “phase distortion” and produce the kind of hard sound, known from cost effecient Japanese audio products.

The resulting sound is incredibly clear and three-dimensional on the one hand, but warm and musical on the other. You will

circuit regulates the control voltage to the

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and a balanced signal path works much like the combination of

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get tired of listening to IA252B.

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Space IA255B

Space IA255B has all the advantages of the IA252B, but it is also capable of delivering 5x 100W. This

Space IA255BSpace IA255B is achieved simply by selecting the surround input, which activates 3 additional channels. For instance either a SACD or DVD audio disc player can be connected to the multi channel input.

Both the IA252B and the IA 255B

Both the IA252B and the IA 255B can be reconfigured through their data ports to act purely as power

Both the IA252B and the IA 255BBoth the IA252B and the IA 255B amplifiers in a Thule Audio home cinema system with AV100, AV120 or PR350B. In the case of the AV100, for instance, the IA252B can be used to power the front speakers, while the six internal poweramplifiers of the AV100 drive the other speakers in an 8.1 system. By adjusting the input selector IA252B/IA255B will switch back to its normal function automatically. By connecting a balanced disc player (e.g. the DVA150B) to the balanced input connection of the IA252B/IA255B you can have both a fully balanced stereo setup and a home cinema in one system.

Both IA252B and the IA255B have WBT loudspeaker connections, and only the best audio grade components have been used in their production. The power supply consist of a massive 2x 350VA transformers with 100.000uF capacitor reservoir. The output stage is equipped with 18 pcs 30ampere Sanken transistors and 18 pcs 25ampere darlington slave transistors.

TECHNICAL SPECIFICATIONS IA252B

TECHNICAL SPECIFICATIONS IA252BTECHNICAL SPECIFICATIONS IA252B

CONNECTIONS CONNECTIONS TECHNICAL QUALITY TECHNICAL QUALITY Stereo line inputs 300mV/20kohm/phono Power output, 1kHz, 8ohm 2x 250W Tape in 300mV/20kohm/phono Power output, 1kHz, 4ohm 2x 400W Tape out 300mV/100ohm/phono Peak current capacity 0.6ohm,1ms +/-45A Balanced input 600mV/20kohm/XLR F requency range 20-20.000Hz +0dB,-0.5dB Pre out 0-600mV/50ohm/phono THD 20-20kHz, -10dB, 8 ohms, 2ch 0,005% Loudspeakers 4-8ohm, screw terminals S/N 110dBA

GENERAL GENERAL Size (W x H x D), net weight 420 x 100 x 375mm, 16kg Max. power consumption 700W

TECHNICAL SPECIFICATIONS IA255B

TECHNICAL SPECIFICATIONS IA255BTECHNICAL SPECIFICATIONS IA255B

CONNECTIONS CONNECTIONS TECHNICAL QUALITY TECHNICAL QUALITY Stereo line inputs 300mV/20kohm/phono Power output, 1kHz, 8ohm 2x 250W/ 5x 100W Surround inputs 300mV/20kohm/phono Power output, 1kHz, 4ohm 2x 400W/ 5x 140W Tape in 300mV/20kohm/phono Peak current capacity 0.6ohm,1ms +/-45A Tape out 300mV/100ohm/phono Frequency range 20-20.000Hz +0dB,-0.5dB Balanced input 600mV/20kohm/XLR THD 20-20kHz, -10dB, 8 ohms, 2ch 0,005% Pre out 0-600mV/50ohm/phono S/N 110dBA Sub out 0-600mV/100ohm/phono GENERAL GENERAL Loudspeakers 4-8ohm, screw terminals Size (W x H x D), net weight 420 x 100 x 375mm, 16kg

Max. power consumption 700W

Desceptively simple