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Owner’s Manual
for the
BT-350
BT-350
Bass Amplifier
Bass Amplifier
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BT-350 ThunderBass Amplifier BT-350 Congratulations! You are now the proud owner of one of the most advanced bass guitar amplifiers available, the Crate BT-350 ThunderBass amp. This flexible and compact unit combines a tube preamp, 7-band graphic equalizer, chorus, bi- amp capabilities and 350 watts of power in a rugged and attractive package that can be rack-mounted in only three spaces. A wide array of front-panel controls along with footswitch options allow you to “tailor” the sound to best s
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BT-350 ThunderBass Amplifier BT-350 Introduction: The Crate BT-350 ThunderBass amp is a high-quality bass guitar amplification system that combines extremely high power with very desirable features. Each feature and control is discussed in detail in the sec- tions entitled “The Front Panel,” “The Rear Panel” and “Using the Biamp Capabilities.” Crate offers a heavy-duty three rack space enclosure (Crate model #CR-3) which will house the BT-350 perfectly, providing the extra protection and conve
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BT-350 ThunderBass Amplifier BT-350 The Front Panel: INPUTS: 1. 0dB INPUT: Connect your bass the impressive 8dB of gain added at seek a more traditional sound. here using a shielded instrument cable. 20Hz, increasing the deep, “floor-shak- 8. HIGH BOOST: Turning on the High The output signal of your bass will run ing” sounds of your instrument. Boost greatly enhances the upper-har- full-strength into the amplifier, which is 5. LOW: Adjust the output level of your monic overtones of your bass, in
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BT-350 ThunderBass Amplifier BT-350 The Front Panel (con’t): 11. LIMIT LED: The BT-350 offers a the Line Out Level control to the right control up from center boosts the output special limiting circuit which helps to increases the output level; to the left at its given frequency; pulling it down keep the output of the amplifier “clean” decreases it. reduces that frequency. The 40Hz and when played at extreme volume levels. 100Hz controls affect the lower notes of NOTE: The Line Level signal is p
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BT-350 ThunderBass Amplifier BT-350 The Rear Panel: 27. SPEAKER OUTPUT jacks: Using a high-frequency power amplifier. See the NOTE: The Balanced Output jack is 1/4” mono phone plug, connect the out- section entitled “Using the Biamp wired as follows: put of the BT-350 to your speaker cabi- Capabilities” on pages 8 and 9 for net(s) via these jacks. Be sure to use details. PIN 1: GROUND heavy gauge speaker cable – not instru- PIN 2: POSITIVE (+) 30. LOW OUT: When used in the biamp ment patch cords
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BT-350 ThunderBass Amplifier BT-350 System Block Diagram: 7 7
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BT-350 ThunderBass Amplifier BT-350 Using the Biamp Capabilities: Your BT-350 can be used along with an additional power amplifier, to “biamp” your system: that is, using two ampli- fier/speaker combinations to share the task of reproducing the full range of your bass. Due to increased efficiencies, the combined output may sound cleaner and more powerful than that of a single-amped system, especially during high-vol- ume, live performances. Using the BT-350 as the low-frequency power amplifier:
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BT-350 ThunderBass Amplifier BT-350 Using the Biamp Capabilities (con’t): Using the BT-350 as the high-frequency power amplifier: In the biamp configuration shown below, the BT-350 serves as the system preamp, biamp crossover, and high-fre- quency power amplifier. A second power amp of 200 to 500 watts may be used to amplify the low frequencies. The crossover frequency (that point where one amplifier ends and the other amp takes over) is set by adjusting the BT-350’s Biamp Frequency control (#13
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BT-350 ThunderBass Amplifier BT-350 Some Suggested Settings: ROCK: Biamp and Chorus controls optional. You can crank the Tube Drive even more for distortion; if you do, back off the EQ level. JAZZ: This will produce a very smooth sound with a minimum of percussive tones. 1 10 0
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BT-350 ThunderBass Amplifier BT-350 Some Suggested Settings: COUNTRY: Increasing the EQ Level produces more clean volume. Set the Master Level to taste. FUNK “POPPING”: Chorus is a great effect with this setting. 1 11 1
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BT-350 ThunderBass Amplifier BT-350 Technical Specifications: Output Power Rating 350 watts @ 0.2% THD, 4 ohm load – 120VAC 200 watts @ 0.2% THD, 8 ohm load – 120VAC Gain @ 1kHz 61dB, tones at “5” Tone Control Range Low Boost +8dB @ 20Hz Low ±13dB @ 40Hz Mid ±11dB @ 260Hz High ±15dB @ 5kHz High Boost +10dB @ 10kHz Graphic EQ Level +8dB, -10dB Graphic EQ Range ±12dB @ 40Hz, 100Hz, 250Hz, 625Hz, 1.6kHz, 4kHz, 10kHz Signal to Noise Ratio 84dB typical Input Impedance 0dB input: 1M ohm -15dB input: 1
