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Adjusts channel balance in 1dB increments via remote control.
Configures S3/proc input for surround sound processor integration.
Controls volume and input selection for the preamplifier.
Functions for muting and unmuting audio output.
Controls playback functions for KRELL CD transports.
Turns KRELL Remote Control Power amplifiers On or Off.
Controls bias level meters on KRELL S-Series amplifiers.
Details single-ended and balanced input connections and XLR pinout.
Describes speaker, tape, and preamplifier output connections.
Addresses loud hum from speakers and potential causes.
Explains uneven channel gain with balanced input.
Outlines the 5-year limited warranty for circuitry.
Lists conditions that will void the product warranty.
Steps to obtain a Return Authorization number for service.
Guidelines for packing and shipping the product for repair.
Details power output, frequency response, and signal-to-noise ratio.
Lists unit dimensions, weight, and shipping weight.
The Krell KAV-300i is a remote-controlled integrated amplifier designed for high-fidelity audio reproduction. It combines the functions of a preamplifier and a power amplifier into a single unit, offering a streamlined solution for audio systems. The amplifier is recognized for its performance, having received the European Imaging and Sound Association (EISA) 1996-1997 European High-End Audio Product of the Year award.
The KAV-300i serves as the central hub for an audio system, accepting multiple audio sources and amplifying the signal to drive loudspeakers. Its core design incorporates proven Krell circuits, utilizing the same high-quality components found in other Krell products, such as resistors and output devices. The amplifier features discrete, fully complementary circuitry from input to output, with all circuits up to the driver stage operating in pure Class A. This design choice contributes to its wide bandwidth and very low negative feedback, aiming for sonic accuracy across the entire frequency spectrum.
The preamplifier section of the KAV-300i is remote-controlled, offering convenience in operation. It includes basic input selection and volume control, accessible from both the front panel and the remote. The power amplifier section delivers a robust 150 watts per channel into 8 ohms, making it capable of driving a wide range of loudspeakers.
A notable feature of the KAV-300i is its "Theater Throughput" capability. The S3/proc input can be configured to operate as a unity gain stage, allowing for simplified integration with an A/V surround sound processor. In this mode, when the S3/proc input is selected, the KAV-300i's volume and balance controls are disabled, transferring volume control to the external surround sound processor. This ensures that the overall system level is determined exclusively by the A/V processor, making it ideal for home theater setups where the KAV-300i handles the front left and right channels.
The amplifier also includes a pair of single-ended preamplifier outputs, enabling it to function solely as a preamplifier when used with a separate power amplifier. Importantly, the speaker outputs remain active even when the preamplifier outputs are in use.
The KAV-300i offers flexible connectivity for various audio sources. It is equipped with three single-ended inputs (S1, S2, and S3/proc) via RCA connectors, one tape monitor loop, and one balanced input (B1) via XLR connectors. The balanced input provides 6dB more gain than the single-ended connections, a detail to consider for level matching in specific installations. Speaker outputs are provided via five-way binding posts, accommodating bare wire, banana plugs, pins, or spade lugs. A single-ended RCA output is also available for tape recording.
Basic operation involves engaging the power switch, either manually or via the remote control. The amplifier incorporates a slow-start protection circuit, which delays the full power-up sequence to prevent excessive current. A red Stand-by LED indicates the initial state, turning off as a blue Power LED illuminates when the amplifier is ready for operation after a short delay and an audible click.
Input selection and volume control are straightforward. Users can choose a listening source and adjust the volume to a comfortable level. It is recommended to lower the volume or mute the output when changing sources to prevent high output transients that could damage the system.
The remote control provides comprehensive control over the KAV-300i's functions, including volume adjustment (LEVEL ▲/▼), input selection (B-1, S-1, S-2, S-3, TAPE), and muting. A unique balance control feature allows for precise adjustment of the left and right channel balance in 1dB increments. When the balance control is activated, the volume control LEDs convert to a balance indicator, with a dimly lit center LED indicating the balanced position and a brighter LED showing the adjusted balance. The Balance LED remains lit if an off-center balance is set and extinguishes when returned to the center. The remote also includes controls for Krell CD transports, such as PLAY, PAUSE, TRACK PREV, and TRACK NEXT, and amplifier functions like PWR (for Krell Remote Control Power amplifiers) and MTR (for Krell S-Series amplifiers' bias level meters).
Proper installation and care are crucial for optimal performance and longevity of the KAV-300i. The unit should be placed on a firm, level surface, free from dirt and moisture. While not particularly hum-sensitive, it's advisable to arrange AC wires separately from audio cables to prevent hum or noise introduction.
The KAV-300i's power supply is robust and does not require a dedicated circuit, but the use of high-quality 15 amp line conditioners or grounded AC strips is recommended over extension cords or multiple AC adapters.
For the "Theater Throughput" configuration, enabling this option requires removing the top cover of the KAV-300i using the supplied T-10 Torx wrench to adjust a jumper setting. This procedure is detailed in the manual and should be performed with the unit unplugged from the AC outlet.
Troubleshooting common issues like hum involves checking cable connections for proper contact and quality, ensuring no power supplies or hum-inducing components are placed directly on or below the unit. Ground loops can often be resolved by using a 3-prong to 2-prong AC adapter (cheater plug) on the KAV-300i or other system components, while always keeping one major component grounded.
If one channel appears to have less gain when using the balanced input, it's recommended to first check and switch input cables to identify if the issue is cable or source-related. If the problem persists, checking output cables is the next step. Additionally, verifying that the Balance LED is not illuminated and correcting the balance via the remote control is important.
The remote control requires two AA size batteries. Batteries should be replaced when remote functions become intermittent. The process involves removing the back plate, replacing the old batteries with new ones according to the diagram, and re-installing the back plate.
For service, Krell emphasizes contacting an authorized dealer, distributor, or the Krell factory to discuss any issues before returning the component. A Return Authorization Number (R/A number) and shipping address must be obtained from the Krell Service Department. It is critical to use the original packaging for safe transit, as Krell may charge for new packaging if the unit is received in non-standard or damaged packaging. The warranty covers parts and labor for five years on circuitry, provided proof of purchase from an authorized dealer or distributor is presented. Unauthorized modifications, voltage conversions, or disassembly will void the warranty.
General| Type | Integrated Amplifier |
|---|---|
| Input Impedance | 47 kOhms |
| Power Output | 150 watts per channel into 8 ohms |
| Frequency Response | 20 Hz to 20 kHz |
| Inputs | 4 x RCA |
| Outputs | 1 tape RCA |
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