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Adcom GTP-550

Surround Sound Tuner Preamplifier

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Adcom GTP-550


The Adcom GTP-550 is designed with two Dolby Pro Logic modes: Dolby Pro Logic and Cinema.

In the Cinema implementation of Dolby Pro Logic, the front channels are equalized and diminishing multiple delays are added to the rear channels. This more closely approximates the sound of a large theatre.

In the Dolby Pro Logic mode, the GTP-550 presents a spatially correct soundstage with precise lateral imaging and front to back depth. This is the second of two preferred modes to properly process Dolby Surround encoded video soundtracks, a growing number of CDs and even the audio portion of some computer games.

The GTP-550 also includes three Digital Signal Processing modes. These delay modes create psycho acoustically correct environments, from an intimate nightclub to an outdoor stadium, all at the touch of a button. This wide array of delay mode options gives you the power to create custom sound-fields for your favourite videos or music events.

The Stadium mode is used for non-Dolby Surround encoded material to recreate a large and acoustically reverberant environment well suited for video sporting events and play back of music events performed in large outdoor arenas. A slight upper midrange frequency emphasis is added to the front channels to enhance intelligibility. Stadium mode is also well suited for playback of older epic movies.

The Concert Hall mode replicates a relatively large indoor performance space. Front channel frequency response is flat for maximum musical clarity while the diminishing multiple rear channel delays first seen in Cinema mode enhance the sense of spaciousness.

In Nightclub mode the GTP-550 synthesizes a smaller and more intimate sound-field ideal for many types of jazz and popular music. Nightclub mode is also a good choice for playback of classic movies with mono soundtracks.

The Five Channel Stereo mode makes full use of a home theatre system's speaker complement and is intended primarily to reproduce large scale musical events such as a full orchestra concert or an opera. In addition, the GTP-550 also includes a two-channel stereo mode for true stereo sound.

When it comes to FM broadcasts the GTP-550's highly sensitive tuner section delivers the clearest sound the transmitted signal allows. All tuner circuitry is isolated on its own low-loss, epoxy board and constructed with specially crafted RF, IF and multiplex decoding circuits for minimal interference and optimal clarity.

The GTP-550 combines the extensive switching and signal processing capabilities with a rare degree of operational simplicity. Straight-forward design and logical control groupings replace the usual intimidating front panels with often inaccessible and confusing multi-function controls.

All these features are easily operated by the GTP-550's infrared remote for total control from anywhere in the room. And the GTP-550 is fitted with high quality input and output connections for four audio and four video sources. This configuration ensures complete compatibility and flexibility for all your home entertainment needs for years to come.


Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.005%

Signal to noise ratio: 100dB (line)

Output: 2V (Pre out)

Digital inputs: optical, coaxial

Dimensions: 108 x 432 x 324mm

Weight: 7.7kg


service manual   English -

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This website is not affiliated with or sponsored by Adcom. To purchase GTP-550 spares or accessories, please contact the company via their website or visit an authorised retailer.