We are here to help you with any questions you might have about your Rotel products and devices, or we can offer insight into the world of sound and sound quality.
Most of Rotel products provide one 3.5mm mini-jack to receive command codes from industry-standard infrared receivers via hard-wired connections. This feature could prove useful when the unit is installed in a cabinet and the front-panel sensor is blocked.
Q: Where is the 3.5mm mini-jack on the unit?
The 3.5mm mini-jack is located on the EXT REM port of the rear panel.
Q: What’s the IR protocol used for Rotel products?
Most current Rotel products use NEC Hex codes as their standard IR library, the base hex library used for most receivers, preamps and integrated amps is NEC 8311, and current Rotel CD players is NEC 8312.
Q: What’s the NEC Protocol?
The NEC IR transmission protocol uses pulse distance encoding of the message bits. Each pulse burst is 560µs in length, at a carrier frequency of 38k Hz. A logical "1" takes 2.25ms to transmit, while a logical "0" is only 1.12ms.
Q: What’s the carrier frequency of the external IR receiver can be used for Rotel products?
Carrier frequency of external IR receiver that works with 38k Hz.
Q: How to connect the Rotel External IR Remote Control?
For standard Rotel products with IR Remote Input require power to the IR Receiver then convert the wireless IR signal to a wired data stream connected to the IR Remote Input on the device.
Below picture shows that External remote connection needs Power Adapter, Connecting Block (IR remote transceiver), IR Receiver (3 pins for power, ground and receiving IR) and one piece of 3.5 mm Plug Shield Cord.
Q: How to choose a Plug Shield Cord?
A 3.5 mm Plug Shield Cord 2-pin or 3-pin cable is required for connection to the Rotel unit for external IR remote connection.
For best performance and the highest streaming quality set the Rotel unit to use USB Audio Class 2.0 from the front setup menu. This will require installation of the Rotel USB driver on Windows based computers (no driver required for Mac) and a reboot of the computer and power cycle of the Rotel device.
You can find more information about installing the Rotel USB driver on this page: Rotel USB Drivers
For information on Roon pricing please visit www.roonlabs.com.
Roon is a software platform allowing you to easily manage and access your library of music as well as music on popular streaming services. Additional information on Roon is available at https://roonlabs.com/howroonworks.
You can find a knowledgebase for Roon and answers to FAQs at https://help.roonlabs.com/portal/en/home.
There is also an article with information on how to contact Roon Technical Support at https://help.roonlabs.com/portal/en/kb/articles/faq-how-to-contact-roon-technical-support.
Yes - if your Rotel product has a back panel input labeled "PC-USB", you can simply connect your computer to this USB input using a standard USB cable. The computer should then recognize the Rotel system as an audio device and you can then play music from your computer through your Rotel system. Do note that you may need to select the speaker as the primary output device for the computer.
If you have a Rotel product that does not have a PC-USB input, if your computer has analog or digital audio outputs you could connect your computer to a Rotel receiver or surround processor using one of the analog or digital inputs as you would connect any other source component such as a DVD player or CD player.
Or, for even better sound quality, add a USB DAC to your system such as the RDD-1580. The RDD-1580 features a rear panel PC-USB connection that can be used to connect your computer to the system for high quality audio playback. The DAC would then connect to your Rotel system using the analog output of the DAC into an analog input in the system.
Absolutely, Rotel has rack ears available for many of the 15 series products, either included or available as an optional accessory. Talk to your authorized dealer for details on this.
For other Rotel products such as the 12 and discontinued 10 series, rackshelves from manufacturers such as Middle Atlantic are often an alternative. The Middle Atlantic RSH series rack shelves offer custom faceplates to provide a seamless look when using a rack shelf with many Rotel products.
A Class D amp works by taking the analog input signal and creating a PWM (pulse width modulation) replica of it-essentially a train of pulses, which correspond to the amplitude and frequency of the input signal. In its most basic form, a comparator circuit is used to match the input signal with the PWM signal. The PWM signal is then amplified by an output stage operating in switch mode, which is to say there are two states, on or off, at very high speed, corresponding to the PWM pulses. A linear amplifier's output stages, by comparison, see a continuous waveform and, to avoid distortion, are on for more than half the waveform (Class A/B) or for the complete waveform (Class A), thus greatly reducing efficiency and generating heat.
The amplified PWM waveform is low pass filtered to recover the audio waveform and eliminate spurious ultrasonic noise before outputting it to the speakers. This process seems digital but is in fact analog in nature. The signal is not "digitized", i.e., assigned a numerical value; the PWM pulse train is an "analog" of the input audio signal. What distinguishes Rotel Class D amps from other designs on the market are innovations in the area of generating a highly accurate PWM signal (COM, which stands for Controlled Oscillation Modulation) and in the feedback circuits (MECC, Multivariable Enhanced Cascade Control) to provide a stable filter characteristic in spite of variable loudspeaker impedances. In simple terms, this means that our Class D amps offer full bandwidth performance at very low distortion in "real world" applications-just like our linear amps, but with the benefits of being smaller, cooler and much more energy efficient.
Why aren't there more Class D amps on the market? For starters, creating stable, full bandwidth Class D circuits while controlling RF/EMI byproducts isn't easy. Few companies have the technological know-how to do it. It also requires extensive use of Surface Mount Devices (SMDs), again putting it out of technological grasp of most audio manufacturers. We have invested with a technology partner to realize these designs.
Here's another key detail that often causes confusion. The Switch Mode Power Supply (SMPS) is not what makes these "switching" amplifiers. As just described, the amplification stage is a high speed switching circuit and what defines this design as Class D. A Class D amp could, in fact, use a conventional power supply; and a linear amp could use a SMPS. A traditional power supply stores large amounts of energy, but wastes "excess" energy not demanded by the load in the process. An SMPS matches output to real-time requirements, supplying only the power required by the load, as a result operating very efficiently. The analogy is a water tank (linear supply), which is always being refilled and spills over if demand is insufficient; compared to an endless series of buckets (SMPS), which can be slowed down or sped up as required. The SMPS in our Class D amps reflects the fact that the Class D amplification circuit does not require the massive energy storage of a linear power amp, so the more efficient/compact SMPS is a better choice.
To sum up, our Class D designs offer:
Rotel models with a front USB input will support Bluetooth streaming when the supplied Bluetooth dongle is connected. Models with built-in aptX Bluetooth streaming can skip step 1 as the Bluetooth module is already active.
NOTE: Not all Bluetooth dongles will operate with the Rotel device. Please use the one supplied. If you do not have the dongle, please contact your local Rotel dealer for assistance obtaining one.