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Primare I35 Stereo integrated amplifier (Titanium)

Item # 244I35TI

The 35 series is Primare's most powerful family of integrated amps, and among the most powerful integrateds we carry.

The 35 series is Primare's most powerful family of integrated amps, and among the most powerful integrateds we carry.

Item # 244I35TI

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About the Primare I35

Steve Kindig

A wolf in sheep's clothing

If you judged the Primare I35 based solely on its elegant looks, you might expect it to sound a bit restrained or polite. Not at all. This powerful integrated amp has the ability to convey the full range of music's energy and emotion. It can produce concert-level dynamics with all but the largest, most power-hungry floor-standing speakers.

A wolf in sheep's clothing

If you judged the Primare I35 based solely on its elegant looks, you might expect it to sound a bit restrained or polite. Not at all. This powerful integrated amp has the ability to convey the full range of music's energy and emotion. It can produce concert-level dynamics with all but the largest, most power-hungry floor-standing speakers.

Primare describes the I35 as an "all analog" integrated amplifier. On the rear panel you'll find five sets of analog stereo inputs: two balanced XLR and three unbalanced RCA. The I35 doesn't include a built-in DAC for decoding digital music sources. If you need that capability, check out Primare's I35 Prisma, which has a DAC along with the terrific Prisma network player.

Primare's refined Class D amp technology

The I35 delivers 150 watts per channel into 8 ohms, and a massive 300 watts per channel into 4 ohms. How can an amp of such modest size and weight generate so much power? Primare's Class D amplifier technology. Class D is known for providing loads of instantaneous current with extremely low distortion, but some audiophiles felt that earlier Class D designs didn't sound as rich and dimensional as the best conventional amps.

Primare has been refining their Class D technology for over ten years, resulting in their latest UFPD 2 (Ultra Fast Power Device) amplifier module. This module is actually a balanced configuration of four discrete amplifiers — two per channel.

No matter what kinds of music you listen to, you'll find the I35's sound to be fast, clean, and agile. Reviewers also frequently praise Primare's Class D amps for sounding unusually smooth and refined.

Stylish sound from Scandinavia

Founded in Sweden in the mid '80s, Primare relies on a talented team of designers to create its innovative high-end audio components. Among audiophiles, their equipment is admired both for its exceptional sound quality and its elegant appearance.


Product highlights:

  • 150 watts x 2 channels into 8 ohms (20-20,000 Hz) at 0.01% THD
  • 300 watts x 2 channels into 4 ohms
  • signal-to-noise ratio: 100 dB
  • 4-ohm capability allows use with a wide range of speakers
  • proprietary UFPD 2 (Ultra Fast Power Device) Class D amplifier technology
  • high-efficiency, low-noise switching power supply with APFC (Active Power-Factor Correction)
  • front-panel OLED display
  • remote control
  • 2 stereo balanced XLR inputs
  • 3 stereo unbalanced RCA inputs
  • 2 stereo RCA analog outputs (one line out w/fixed volume for dubbing; one pre-out w/volume control for connecting an amplifier or powered subwoofer)
  • no phono input — to connect a turntable, consider adding Primare's R35 phono preamp
  • gold-plated binding post speaker terminals accept bare wire, banana plugs, and pin connectors
  • 3.5mm IR remote control in/out can be used with an optional IR repeater system and compatible Primare products
  • 3.5mm 12V trigger output allows the I35 to switch on other devices
  • RS-232 port for use with home automation control systems, like Crestron
  • detachable power cord
Dimensions and warranty:
  • 16-15/16"W x 4-3/16"H x 17-15/16"D
  • weight: 24.2 lbs.
  • warranty: 3 years
  • MFR # PRIS30I35TTM

What's in the box:

  • Integrated amplifier
  • 6' AC power cord
  • Remote control (C25)
  • 2 "AAA" batteries
  • Two 59" Mono-minijack cables
  • AC polarity pen
  • Thank You Letter
  • Safety And Warning Notification

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More details on the Primare I35

Stacey B.

Features & specs

Performance Specs
Watts RMS per Channel (8-ohms) 150
Watts RMS per Channel (6-ohms) Not given
Watts RMS per Channel (4-ohms) 300
Frequency Bandwidth 20-20k
THD 0.01%
Minimum Impedance N/A ohms
Amplifier Class D
Signal to Noise Ratio 100
DAC Bit Depth N/A
DAC Sample Rate N/A
Built-in DAC (Digital to Analog Converter) No
Bluetooth No
Wi-Fi N/A
Built-in Radio Tuner None
Room Correction No
High-res Audio Playback
From Network No
From USB Thumb Drive (USB-A) No
From Computer (USB-B) No
RCA Line-level Inputs 3
XLR Line-level Inputs 2
Phono Input No
Optical Digital Inputs No
Coaxial Digital Inputs No
USB Input No
HDMI Inputs 0
Stereo Preamp Outputs Yes
Subwoofer Outputs No
Recording Output Yes
HDMI Output 0
Home Theater Bypass Fixed
Pre-out/Main-in Loop No
Headphone Output No
Removable Power Cord IEC 3-prong
Streaming Compatibility
Apple AirPlay No
Apple AirPlay 2 No
DTS Play-Fi No
Chromecast built-in No
Roon No
BluOS No
Dimensions and Warranty
Width (inches) 17
Height (inches) 4-1/4
Depth (inches) 17-15/16
Weight (pounds) 24.2
Parts Warranty 3 Years
Labor Warranty 3 Years

Product Research


UFPD 2 Amplification Technology: The amplifier section utilizes Primare's new proprietary UFPD 2 power technology, providing immediate and sustained high power output with very low distortion, instantaneous rise time and absolutely linear amplification across the entire bandwidth resulting in a naturally fast, clean and agile sound over an ultra-wide frequency range and with exceptional headroom. UFPD 2 combines state of the art Class D amplifier efficiency together with state of the art audio performance. Providing 150 watts at 8 ohms and 300 watts at 4 ohms of linear UFPD 2 amplification across the entire audible bandwidth, the I35 delivers naturally fast, clean and agile sound with an unprecedented ability to bring music to life.

  • Class D Technology: Class D amplifier technology has many inherent advantages, one of which is the ability to locate the heat sink directly on the circuit board within the amplification module, considerably reducing circuit path length and allowing for the power output devices to be directly connected to the speaker output connection posts. The term "Class D" is sometimes misunderstood as meaning a "digital" amplifier. While some Class D amps may indeed be controlled by digital circuits or include digital signal processing devices, Primare’s UFPD 2 amp modules operate entirely in the analog domain. Basically, the UFPD 2 amplifier module takes an analog input sine wave and converts it into a high-frequency pulse-width modulated square wave for amplification. This square wave is then filtered, resulting in an amplified analog sine wave at the output.
  • New Amplifier Circuit: Within the UFPD 2 is a new amplifier circuit has been developed that does not affect the gain versus frequency curve and thereby the bandwidth does not have to be limited. This gives very low phase shift in the audio band and a larger closed loop bandwidth. Using a custom made output coil in the 2nd order filter error amplifier with the same loop gain results in feedback control across the entire audio band. It has been optimized to keep the loop gain constant in the audio band, which means it is actually lower at low frequencies than with UFPD but much higher at high frequencies. The result is even more linear amplification, with lower noise, providing an absolute silent background from which music has a more holographic, three-dimensional, life-like character and richness

Thoroughly Implemented Power Supply: A thoroughly implemented power supply design is utilized so that the Primare I35 can operate effortlessly at its fullest effectiveness. The power supply has been carefully selected, meticulously crafted, and strategically inserted into the I35 integrated amplifier.

  • Switch Mode Power Supply: Given the speed with which the UFPD 2 amplifier module is able to deliver power to a speaker a switch mode power supply was the only choice in that it allows for rapidly varying demand, providing much more stable voltage, with ancillary capacitive storage to meet peak transient burst requirements.
  • Active Power-Factory Correction (APFC): This newly developed Active Power-Factor Correction (APFC) converter is as much as 5% more efficient than past supplies, and comprises dual PFC converters 180 degrees out of phase from each other. AFPC is used to avoid input current harmonics, thereby minimizing interference with other devices being powered from the same source. This reduces the total current ripple and improves EMC (Electromotive Compatibility), while current ripple at the output of the PFC converter is also reduced, which decreases stress within the circuit for prolonged life. Additionally, the supply operates in what is called "transition mode", minimizing switching losses and improving overall efficiency in delivering power to the UFPD 2 amplification module.

Simple Circuitry Design: The I35 utilizes simple circuitry design and architecture with ultra-short signal paths, double-sided circuit boards, and surface-mount components for natural and unaltered sound.

  • Ultra-Short Signal Paths: Ultra-short signal paths are used so that each individual component and sub circuit operates sympathetically to achieve a cohesive whole. Elegant and simple electrical designs are used in even the most complex product, utilizing ultra-short signal paths with all gain in one device whenever possible. Ultimately, this results in fewer, higher quality parts for a reduction in associated distortions and an increase in overall electrical efficiency.
  • Double-Sided Circuit Board Construction: 2 and 4-layer double-sided circuit board construction allows for the most direct and efficient layout of circuit components not only for the shortest signal path, but also to more easily achieve a sympathetic layout of circuit and sub-circuit components for best performance.
  • Surface-Mount Components: Surface-mount components are used whenever possible as this allows for direct connection of the circuit device or component to the circuit board trace with the solder being used solely to mechanically hold the part in place. The elimination of the small metal lead or wire at each connection point in a more conventional large scale circuit device or component cumulatively shortens the signal path.

Balanced & Unbalanced Analog Inputs (Fixed or Variable): The Primare I35 integrated amplifier is equipped with two pair of stereo balanced XLR inputs and three pair of stereo unbalanced RCA inputs. Balanced connections guard against induced noise and allow long cable runs without compromising sound quality. The analog inputs can be set to a fixed or variable gain. The variable gain is adjustable from -30dB to 0dB in 1dB increments.


  • There is no phono input. If you want to connect a turntable, you'll need a turntable with a built-in preamplifier or an external phono preamp (sold separately).
  • This unit is not equipped with a built-in DAC and there are no digital audio inputs.

Line Out & Pre-Out: The Primare I35 features a stereo RCA line output and a stereo RCA pre-out. The stereo RCA line output can be used for audio dubbing. The stereo RCA pre-out can be used to connect a powered subwoofer or external power amplifier.

Binding Posts: The Primare I35 is equipped with four heavy-duty, gold-plated binding post terminals to connect a single pair of loudspeakers. The binding post terminals will accept bare wire (up to 10AWG), pin-connectors, and banana plugs (single only). You can connect a single pair of 4 ohm to 8 ohm speakers.

Remote Control: The Primare I35 comes with an IR remote controls, plus features IR input/output connections, a 12V Trigger output, and a RS232 port.

  • IR Remote: The included IR remote provides wireless operation of the I35 integrated amplifier. The remote can also be used to control other Primare components, such as a CD or network player.
  • IR Input/Output: The IR input (3.5mm) and IR output (3.5mm) can be used with an optional IR repeater system (sold separately) and compatible Primare products.
  • 12V Trigger Out: The 12V Trigger output (3.5mm) allows the I35 integrated amp to switch on other devices, such as the Primare DD35 CD transport.
  • RS232 Port: The RS232 port allows you to connect the I35 integrated amp to a third-party home automation control systems, such as Crestron (sold separately).

Front-Panel Display: The units front-panel display indicates source input, volume level, and other menu settings. The Front-panel display also shows song/artist/album information (no album art). You can adjust the brightness of the display; set it to High, Mid, Low, or Off. There is also an Auto-Dim function that automatically dims the display after 1, 5, or 10 minutes of no user interaction.

Volume Settings: The integrated amp has a volume range of 0 to 99. You can adjust the units start up volume (0-60), maximum volume (0-99), and mute volume level (0-30).

Auto-Sense & Auto Standby: The Auto-Sense function automatically turns on the integrated amp when it sense an audio signal. The unit will enter Standby automatically when there is no audio signal and no user interaction for 10, 15, or 20 minutes. These functions can also be turned off.

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