PRE35 Prisma Preamplifier User Guide

Additional information

These instructions help you get the best possible sound from your PRE35.


The phase of the AC supply can make a significant difference to the sound.

Use the Polarity Pen supplied with the PRE35 to verify which pin is live on your AC power cable.

Ensure that the live pin of the AC power cable is connected to the left-hand pin of the power connector, viewed from the back panel:


Your Primare will start to sound best after an initial burn-in of approximately 24 hours. 

You will notice a further smaller improvement in sound quality for at least another 3 days’ playing.

RS232 and trigger

The RS232 input allows you to connect the PRE35 to a controller system. Use a twisted (null modem) cable. For more information contact Primare at or visit

The Trigger output allows the PRE35 to switch on other devices, such as a DD35.

Using the PRE35 with a DD35

Your PRE35 is an ideal companion to the Primare DD35 CD Transport. For best results link the two products together as follows using the two cables supplied with the PRE35:

To connect the trigger cable

The Trigger cable ensures that the DD35 switches on, or to standby, when you operate the  button on the front panel of the PRE35.

  • Connect the Trigger cable from the PRE35 TRIG OUT to the DD35 TRIG IN.

Error messages

The following error messages on the front panel display indicate an error condition:


Clipping has occurred on an input. Decrease the input gain; see Input gain.


Try the following

  • Power off PRE35 and disconnect the speaker connections.

If this solves the problem, check the speaker wiring.

If the problem persists

  • Power off PRE35 and disconnect all input connections.

If this solves the problem, there is a DC offset on one of the inputs.

If the problem persists

  • Contact your dealer for service arrangements.

Factory reset

Press and hold the standby button on the front panel to display the main firmware version number.

Press and hold the standby button on the front panel for 10 seconds to perform a factory reset of the PRE35.

You can also do a factory reset from the Prisma app, or from the the standby button menu; see General settings.

Network troubleshooting

Front panel display

The front panel display indicates the type of network connection:

LAN indicates that you are connected by an Ethernet cable.

WiFi indicates that you are connected by wireless. 

Network status

The CON indicator on the back panel indicates the network status:

ON Indicates the PRE35 is connected to a network

OFF Indicates no connection to a network

Flashing indicates that the network needs to be configured using the Google Home app.

Spotify Connect

The Spotify Software is subject to third party licenses found here:

Legal attributions

Apple, iPad, iPad Air, iPad Pro, iPhone and AirPlay are trademarks of Apple Inc., registered in the U.S. and other countries.

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc.

Chromecast built-in is a trademark of Google LLC.

SPOTIFY is a registered trademark of Spotify AB.


Printing or saving as PDF

You can print an on-line Primare user guide from your web browser, to provide you with a permanent copy to refer to away from your computer.

Alternatively, you can save a user guide as PDF files, to refer to when are you not connected to the internet.

To do so, simply choose Print, or Print followed by Save as PDF, from your browser’s File menu.

For the specific procedure for each of the most popular web browsers see How do I print or save a PDF copy of the on-user guides?.


You can use Google Translate to translate the contents of the Primare website. To do that, select the language you would like to translate into in the list below.

Please bear in mind, since the Google Translate is an automatically generated translation, we do not take any responsibility for errors in the text.