Stereo/Dual Mono equaliser.
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The API 5500 is a Stereo/Dual Mono equaliser with a balanced input, a true straight-wire bypass, an integrated power supply with noiseless muting and a range of features that make it suitable for mastering applications.
Based on the API 550 console equaliser, the 5500 does not contain integrated circuits in its signal path. The gain for the 55000 is provided by two hand-built 2520 Operational Amplifiers contained in each channel. The balanced input is handled by a 2510 Discrete Operational Amplifier, which is similar to the 2520, but without the high-current output stage. A key component of the API sound, the 2520 coupled with the API 2503 output transformer, is capable of delivering +30dBm before clipping. The range of the amplitude controls can be reduced to 1/2 or 1/4 of the stated scale, providing a means to adjust the tonal balance with finer resolution in an even gentler manner..
API’s 5500 also features a true hard-wire bypass which wires the output connector directly to the input. Shortly after the power is first applied, or immediately after it is lost, a special circuit enables “bypass mode” so that power thumps are never heard.
The 5500’s input XLR is connected to an active balanced circuit. The unit’s output XLR is driven from a transformer coupled output and can drive any load from 600 ohms or more to full output capability. There is no change from input to output in the unit’s polarity, so it is suitable in studios using either pin 2 or pin 3 as the “hot” connection. Additionally, the 5500 has a 1/4 inch input connector that interrupts any present signal on the input XLR. It is balanced and can be driven from either balanced or unbalanced sources. A positive signal on the tip will deliver a positive signal on pin 2 of the output XLR. Using the 1/4 inch input does not bypass any internal circuitry and does not change the gain or operating levels. The 5500 features API’s industry exclusive five-year parts warranty.
• Classic 550b Equalizer design
• Two range switches to individually alter gain steps
• Useable as a 550b, 550D or 550M
• Peak/shelf switch on Hi and Lo bands
• True hardwire bypass
• Balanced In and Out on XLR
• Unbalanced input on 1/4″
• EQ In/Out switch