I25 Integrated Amplifier User Guide

Additional information

These instructions help you get the best possible sound from your I25.


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

Use the Polarity Pen supplied with the I25 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 I25 to a controller system. Use a twisted (null modem) cable. For more information contact Primare at info@primare.net or visit www.primare.net.

The Trigger output allows the I25 to switch on other devices, such as a DD35.

Using the I25 with a DD35

Your I25 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 I25:

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 I25.

  • Connect the Trigger cable from the I25 TRIG OUT to the DD35 TRIG IN.

Error message

The following error message on the front panel display indicates an error condition:


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

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 I25.

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


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.