Rotel Support
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FAQ - How Do I setup Bi-wiring and Bi-amping Speaker Output Connection
Technical Service Bulletin
August 13, 2024
There are several different speaker connecting methods to an amplifier or AV receivers, the choice of these methods can impact the sound quality and performance.
Bi-wiring and Bi-amping are the most common methods that both of them involve using separate cables for the high and low-frequency drivers of a pair of speakers.
Bi-Wiring
Bi-wiring only requires a single one audio amplifier channel, instead of using a single pair of wires to connect the amplifier to the speaker’s crossover, Bi-wiring would separate the audio signal into two separate frequencies bands and sends them through separate sets of wires, each set of wires can handle a narrow frequency to improve the sound quality (i.e., accurate and clear), but... it’s not necessarily a guaranteed way to improve sound quality.
Below is an example of Bi-Wiring speaker output connection to 1 unit of RB-1590 stereo power amplifier
Bi-Amping
Whereas Bi-amping requires two separate audio amplifier channels that with each channel dedicated to a specific frequency range of the speaker, by using a separate audio channel for each frequency range, Bi-amping is designed to provide more power and precise control to improve the sound quality (i.e., dynamic range) and reduce inter-modulation distortion.
This method can also allow for better speaker matching, as each channel can be specifically chosen to match the frequency range of the driver it is powering.
Below is an example of Bi-Amping speaker output connection to 2 units of RB-1590 stereo power amplifier
In general, it would be worth experimenting with both above two methods to see which one provides the best sound quality for listener's particular setup with specified audio equipment.
FAQ - Rotel CD Player Abruptly Stopping Improvement
Technical Service Bulletin
July 25, 2024
CD11, CD11 Tribute, CD11MKII, CD14, CD14MKII, RCD-1572, RCD-1572MKII, DT-6000
In above Rotel CD players, an annoying abruptly stopping issue has been identified in earlier developed software versions.
A rare but possible issue may occur if laser pick-up reads and reports wrong data during playback on some specified discs. If the error occurs the correction system could cause the CD player to mistakenly abort and stop the playback status.
This issue has been resolved in the latest released main software versions as listed below. New production starting with the serial numbers in the list already have the updated software installed at the time of production. Should you require this update in a CD player please contact an authorized Rotel dealer or authorized Service Center.
Affected unit models include: CD11, CD11 Tribute, CD11MKII, CD14, CD14MKII, RCD-1572, RCD-1572MKII, DT-6000
Betroffene Modelle:
CD11 Tribute | CD11MKII | CD14MKII | DT-6000 | RCD-1572MKII
FAQ - Rotel CD Player Random Order Algorithm Optimization
Technical Service Bulletin
July 25, 2024
CD11, CD11 Tribute, CD11MKII, CD14, CD14MKII, RCD-1572, RCD-1572MKII, DT-6000
In above Rotel CD players, a random order algorithm issue has been identified in earlier developed software versions.
When the system completes the TOC reading and is ready to play, pushing the [RANDOM] button on IR remote enables random playback mode. The begins playback starting on the 1st track of CD album every time as below and not the first track in the random list.
Original Random Playback Order
Corrected Random Playback Order
This issue has been resolved in the latest released main software versions as listed below. New production starting with the serial numbers in the list already have the updated software installed at the time of production. Should you require this update in a CD player please contact an authorized Rotel dealer or authorized Service Center.
Affected unit models include: CD11, CD11 Tribute, CD11MKII, CD14, CD14MKII, RCD-1572, RCD-1572MKII, DT-6000
Betroffene Modelle:
CD11 Tribute | CD11MKII | CD14MKII | DT-6000 | RCD-1572MKII
FAQ - Rotel CD Player Repeat Endlessly Last Track Improvement
Technical Service Bulletin
July 25, 2024
CD11, CD11 Tribute, CD11MKII, CD14, CD14MKII, RCD-1572, RCD-1572MKII, DT-6000
In above Rotel CD players, an annoying repeat endlessly last track issue has been found in earlier developed software versions.
The issue occurs after pressing the [<<] reverse search button on the remote during playback and allowing the unit to backward searches for a few seconds the restore normal playback When the device reaches the end of the CD album the system mistakenly repeats the last track endlessly instead of stopping playback.
This issue has been resolved in the latest released main software versions as listed below. New production starting with the serial numbers in the list already have the updated software installed at the time of production. Should you require this update in a CD player please contact an authorized Rotel dealer or authorized Service Center.
Affected unit models include: CD11, CD11 Tribute, CD11MKII, CD14, CD14MKII, RCD-1572, RCD-1572MKII, DT-6000
Betroffene Modelle:
CD11 Tribute | CD11MKII | CD14MKII | DT-6000 | RCD-1572MKII
FAQ’s -Rotel Wired IR Connection Function and Requirements
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.
How do I configure Rotel to operate with Roon?
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
Wie funktioniert der „Home Theater Bypass“?
Die Pass-Through-Funktion erlaubt es, das Audiosignal eines Surround-Receivers oder Prozessors ohne jede Signalveränderung durch einen getrennten Stereo-Vorverstärker zu leiten. Das ist dann praktisch, wenn Sie eine hochwertige zweikanalige Anlage haben, gelegentlich aber Videos mit Surround-Ton wiedergeben wollen.
Um den Bypass-Modus beim RC-1580 zu nutzen, verbinden Sie den Ausgang der Frontkanäle des Surround-Prozessors mit dem Eingang „Tape 2“. Wenn der Eingang „Tape 2“ gewählt ist wird das Signal vom Prozessor direkt durch den Vorverstärker geleitet, wobei Lautstärke- und Klangregelung umgangen werden. Wenn der Bypass-Modus aktiv ist, leuchtet die Anzeige BYPASS auf der Frontplatte.
Wenn eine Anlage in dieser Weise konfiguriert ist, kann ein Stereoverstärker für die Frontkanäle eines Surround-Systems integriert werden. Die Bypass-Funktion ist nur über den Eingang „Tape 2“ möglich. Sie erfordert keine weiteren Einstellungen und es kann über den Eingangswähler einfach zwischen normalem Stereobetrieb und Surround-Betrieb umgeschaltet werden.
Betroffene Modelle:
RC-1580
How much does Roon cost?
For information on Roon pricing please visit www.roonlabs.com.
Michi Bluetooth 5.1 aptX™ HD Module
Technical Service Bulletin
June 16, 2023
Michi Bluetooth 5.1 aptX™ HD Module
The latest Apple iOS version (including OS V15.7.2) may cause the APPLE MUSIC app to stop playing audio when manually jumping between tracks in a playlist. The Bluetooth connection is maintained but there is no audio output and no playback information (sample frequency and/or bit rate) displayed. A hard power cycle of the unit remedies this issue.
Earlier versions of iOS do not appear to have the same issue. Other iOS Apps (i.e. iTunes, Spotify, Tidal, etc.) are NOT affected by this use case.
If this is reported, please contact Rotel at sales@rotelglobal.com to order a new Bluetooth 5.1 module (Rotel Part Number: 093E-BTM0002-D-3) with updated firmware V1.04 (or newer) that resolves this iOS compatibility issue.
Note: All new delivered spare parts will be programmed by new firmware V1.04 (or newer) before package and shipment from now on, either of below two methods can help to identify this change.
1. Check and ensure a printed label with text "V1.04" being pasted on plastic package.
2. Or check and ensure the last 5 digits on the pasted BT ADDRESS label are higher than "28780".
Bluetooth module replacement requires removal of the top cover and replacing the Bluetooth module in the socket (no special tools or soldering is required) as shown below.
Affected unit models include: X3, X5, P5, X3 Series 2, X5, Series 2, P5 Series 2
Release Type
| Maintenance | √ | Major | Critical |
X3 Series 2
Software Information
Main Version V2.00
Serial Number (Change will be effective in units after the serial numbers listed below.)
Black 283-314-1050
X5 Series 2
Software Information
Main Version V2.02
Serial Number (Change will be effective in units after the serial numbers listed below.)
Black 284-315-1050
P5 Series 2
Software Information
Main Version V2.00
Serial Number (Change will be effective in units after the serial numbers listed below.)
Black 282-310-1050
Release Notes
● Part Number of New Bluetooth Module 5.1 is 093E-BTM0002-D-3
● New Bluetooth module 5.1 built Qualcomm IC as below photo.
The Instruction use Michi X5 Bluetooth Dongle Replacement as example
b. Remove the Bluetooth 5.1 dongle from the socket.
c. Prepare the new ordered Bluetooth dongle (with firmware V1.04 or higher installed)
d. Install the new Bluetooth 5.1 dongle in the socket. Pay CAREFUL attention to pin alignment to avoid damage to the dongle and the unit.
e. Reassembly the unit and top cover.
f. Test to verify the new Bluetooth module works properly.
PDF file download please click below:
Technical Service Bulletin - Michi Bluetooth 5.1 aptX™ HD Module
Betroffene Modelle:
P5 Series 2 | X3 Series 2 | X5 Series 2 | X3 | X5 | P5
