You've read the reviews, andan followed everyone' everyone's advice on upgrading your system. You have new speakers front and back, and a well-designed subwoofer system. Now you need power to drive everything, but space and budget are both looking tight. If you fit into that category, and particularly if you listen to a lot of compressed audio, the folks at JBL have a solution for you. With the GTR-7535 amplifier, you can drive five channels of audio, improve your system's sound quality, and allow hands-free receiving of phone calls, all with one compact amp. Priced right around $549 in the U.S., the GTR-7535 is rated at 4x75 watts per channel into four ohms, and the sub channel is rated for up to 350 watts into two ohms. But this is an amplifier that brings a lot more than just power to the table.
The JBL GTR series of amplifiers are built on rugged cast aluminum chassis, designed to be easy to install and fit in tight spaces. Generously-sized power and speaker connections are found along the length of one side of the amp, and the signal input and adjustment controls are located on the opposite side. There are crossover controls for front rear and sub channels, with the front and rears having adjustability from 32 to 320 Hz in high- or low-pass configurations. The subwoofer channel has the same frequency range in lowpass. The signal for the subwoofer input can be delivered separately, which is handy if you have a sublevel control on your source unit, or it can be derived internally from the main four-channel inputs. A 0/180-degree phase switch is also included for the sub channel, as well as an adjustable bass boost with up to 9 dB of boost available.
If you plan to drive the amplifier with speaker-level input signals, there are handy adapters included. Simply connect the speaker wires to these voltage dividing adaptors and plug them into the appropriate RCA input, then select the highlevel position on the amp's gain range switch.
What makes the GTR-7535 quite different from other five-channel amplifiers, however, is JBL's proprietary Clari-Fi DSP technology. This circuitry is specifically designed for people who listen to compressed digital music. The Clari-Fi is based on a predictive algorithm that restores audio content that is lost in the compression process. JBL claims that the Clari-Fi circuitry restores the natural warmth of vocals and extends the high frequency bandwidth, restoring your music to its original quality. You can learn more about Clarifi and hear a demo at ClarifiSound.com.
Another feature that separates the GTR-7535 from most other amplifiers is the remote-mounted control panel with Bluetooth. This included accessory allows you to easily stream audio from your smartphone or other Bluetooth device directly to the amplifier. You can even receive phone calls through the audio system simply by pressing a button on the control panel. If your car is already equipped with some sort of ADAS (Advanced Driver Assistance System), the GTR amplifier can inform you with safety and navigation prompts via Bluetooth. A switch on the amplifier allows you to select which speaker is used for ADAS alerts. When an ADAS system is connected to the amplifier, the amp will automatically mute your music, broadcast the ADAS message, and then return to your tunes. And thanks to the unit's Party Mode, anyone in the car can connect via Bluetooth and play road trip DJ! When in Party Mode, up to three devices can stream audio content without a permanent Bluetooth pairing.