GTA | The Best Value Series 4ch Power Amplifier

GTA 475

Sales start 02/06 Order number EAN number 3165144315759 Top features: 4/3/2-channel class A/B amplifier Max. power 4 x 160/2 x 425 watts into 4 ohms World innovation! Direct Aux Input for direct hook-up of portable music players and navigation systems ideal solution for radios not equipped with an Aux-in HighLevel inputs for direct connection to the car radios speaker outputs (if no preamp output available) 2-ohm stable output stages (4-ohm stable in bridged mode) for increased flexibility in system configuration Variable high- and low-pass filters, variable BassBoost
Audio Components CM/MKA Krichel ZG 2005.31 12/05
GTA 475 GTA | The Best Value Series 4ch Power Amplifier
A small feature that makes a big difference.
Many car radios nowadays still lack a separate Aux input for connecting an external signal source. And in the OE audio systems installed at the factory, this additional input is also still an absolute exception. Being so, the additional audio installation of a portable music player such as an iPod, a DVD player or a navigation system was virtually impossible in the past. Blaupunkt now offers a simple and effective solution to this problem: An amplifier equipped with a Direct Aux Input. The auxiliary source is now connected directly to the amplifier which not only enhances the music experience due to its ample power reserves but also serves as a mixer for the different audio signals. The great thing about the Direct Aux Input: There is no additional switching facility required! Simply hook up the signal source to the amp via the optional connection cable (001 525) thats it! How it works in practice: The amplifier is switched on by the car radio via the remote signal. Then turn down the volume completely on the car radio and control it directly on the external source. The big advantage: When receiving a traffic announcement, it is simply mixed into the music signal and put through directly.
The GTA 475 has one Direct Aux Input each for the front and rear channels. This would even allow to hear the navigation voice output loud and clear in the front seats while the kids in the back row enjoy their our own music program from the portable MP3 player.
Direct input for portable music and navigation
To play back a portable music player such as an iPod via all four channels, a Y adapter is optionally required (available under the P/N 001 524).
Things can be so easy: The headphones output of the portable navigation system is connected to the Direct Aux Input of the GTA 475 and the driving recommendations will be simply mixed into the music signal. The voice output volume is adjusted directly on the navigation system.
Everything under control the fully featured rear connector panel of the GTA 475. New: HighLevel inputs for direct hook-up to the radios speaker outputs (ideal if the radio has no preamp outputs).

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Specifications Total output power into 4 ohms Max. power into 4 ohms Max. power into 2 ohms RMS power into 4 ohms RMS power into 2 ohms Number of channels Frequency response S/N ratio THD at rated power Input impedance Attenuation factor (related to 4 ohms) Input sensitivity Input sensitivity of Direct Aux Input Stability Low-pass filter High-pass filter Subsonic filter BassBoost Inputs
Outputs Line-out Dimensions (w x h x d)
850 watts 4 x 160/2 x 425 watts 4 x 210 watts 4 x 75/2 x 210 watts 4 x 105 watts 4/3/35,000 Hz > 95 dBA < 0.03 % > 10 kohms > 100 0.V 300 mV 2-ohm (4-ohm in bridged mode) Hz (12 dB slope) Hz (12 dB slope) dB at 45 Hz 4 x Cinch/RCA gold-plated 4 x HighLevel 2 x Direct Aux Input via 3.5 mm stereo jack 4 x speakers 352.5 x 53 x 268.5 mm
Subject to technical modification

GB Introduction

Congratulations on your purchase of a high-quality GTA power amplifier. By selecting the GTA 4100, you have chosen a product which delivers superlative reproduction quality. Whether you are upgrading an existing system or using the GTA power amplifier in a new system, you are certain to notice immediate performance benefits!

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Recommendation: A power amplifiers performance is only as good as its installation. Proper installation will maximise the overall performance of your audio system. We recommend that you have our product installed professionally. Should you decide to install the amplifier yourself, however, please read through these instructions carefully, and take your time over the installation. Finally, a word about your health: please bear in mind when playing music in your car that sustained sound levels above 100 dB can damage your hearing and may even result in total hearing loss. Modern high-performance systems and high-quality loudspeaker configurations are quite capable of generating noise levels above 130 dB. Safety precautions Instructions for installation and connection Fit a fuse in the amplifier power line no more than 30 cm from the vehicle battery, in order to protect the battery in the event of a short-circuit between it and the power amplifier. The amplifiers own fuse protects the amplifier itself, but not the car battery. Disconnect the negative terminal of the battery before carrying out installation and connection work. Observe the vehicle manufacturers safety instructions (regarding airbags, alarm systems, trip computers, vehicle immobilisers). The final stage must be installed professionally for reasons of safety. The mounting surface must be suitable for the screws provided, and must provide firm support.When drilling holes, take care to avoid damage to vehicle components (battery, cables, fuse boxes). Fit the amplifier in a suitable location, e.g. beneath the seats or in the trunk (Fig. 1). The mounting location must also be dry, and provide sufficient ventilation for cooling of the amplifier. Use cable grommets when passing cables through holes with sharp edges. Use loudspeakers with an impedance of 2 to 4. Observe the max. power handling specifications (music output). Do not connect the loudspeakers to ground; only use the terminals provided. The cross-section of the positive and negative cable must be at least 6 mm2. Amplifier GTA 4100 The amplifier is suitable for connection to car radios with Cinch connector.Use the Blaupunkt ISO Cinch adapter to connect the amplifier to car radios with ISO connector. (893 093/ 855 094)

Connect remote amplifier connection to switchable +12 V power source. This enables the amplifier to be switched on and off with the radios On/ Off switch.
Gain control The gain control enables the input sensitivity of the final stage to be matched to the output voltage of your car radio preamp output. The range of adjustment extends from 0.1 V to 8 V. Adjust the input sensitivity in accordance with the manufacturers specifications when connecting the amplifier to other radios. Important: Turning the gain control clockwise increases the input sensitivity of the amplifier, and thereby also the volume. The gain control is however not a volume control; an increase in volume is not achieved in the maximum position, even if this subjectively appears to be the case. The system merely increases the volume more quickly when the volume is turned up on the radio. Tri-mode loudspeaker connections GTA amplifiers can be used in a combined mono/stereo mode (Fig. 7). This facility enables the amplifier to be uqd simultaneously with stereo satellite speakers (mid-range and tweeter) and a mono subwoofer. The connections are somewhat more complicated in this case, as they require the use of passive crossover networks (not supplied with the amplifier) which divide the frequency ranges between the various loudspeakers. CAUTION: In tri-mode (combined mono/stereo mode) the amplifier must be presented with a load of at least 2 Ohms (stereo satellite speakers) or 4 Ohms (mono subwoofers). Lower loads cause overheating of the amplifier and may damage it permanently. Loudspeaker connections (If the amplifier is to be connected in a bridged mode, proceed with the section Bridged loudspeaker connections.) As with any audio component, connection of the amplifier and speakers with the correct polarity is essential for good bass reproduction. Ensure therefore when connecting that the positive (+) amplifier terminal is connected to the positive (+) loudspeaker terminal. The same applies to the negative (-) terminals. The left-hand amplifier channel must also be connected to the left-hand loudspeaker and the right-hand amplifier channel to the right-hand loudspeaker. Loudspeaker, 4 Ohm (min. 2 Ohm). Bridged loudspeaker connections The GTA can also be bridged in a mono configuration. This enables you to use the amplifier for one or more subwoofer(s) or a mid-range speaker. In this configuration the amplifier sums the right-hand and left-hand channels, delivering a single channel (mono) output. Note: The amplifier can sum the right- and left-hand signal information only if both the right- and left-hand RCA connections have been made. CAUTION: The amplifier must be presented with a load of 4 Ohms or higher in bridged mode. A lower load will cause the amplifier to overheat or switch off. This can lead to permanent damage of the unit. Adjustment of the type and range of the cross-over frequencies. Note: If the amplifier is to be used in the tri-mode configuration, the crossover frequency selector switch must be set to Flat in order to make the full frequency range available. GTA 4100 The type of crossover (i.e. low-pass or hi-pass) and the desired crossover frequency can be selected on the GTA 4100. If, for example, you wish to drive a pair of subwoofers, connect in accordance with the lowpass diagram,.The crossover frequency is dependent upon the loudspeaker frequency range (consult the loudspeaker manufacturers data for the recommended frequency range). Low-pass frequency control This control is active when the switch is set to Low-pass and permits selection of the desired crossover frequency. Example: at a setting of 90 Hz, the loudspeaker has a frequency range of 40 Hz to 90 Hz. This information is subject to change without notice!