Pearl Reference

Burmester · Power conditioning

Burmester 948 Power Conditioner

$12,000

Signature technologiesThe Burmester story

On demonstration in our Portland showroom

Burmester · Power conditioning

The 948 is Burmester's power conditioner: eight star-grounded outlets fed straight from the wall, with a patented 500 W amplifier working in parallel with the mains to cancel the DC component that saturates audio transformers, two RF filters on the outlets that need them, a front-panel display that reads the mains in volts or its DC content in millivolts, and no current limitation anywhere in the path.

Standard configuration: four filtered and four unfiltered outlets, the unfiltered pair for power amplifiers. Switched and unswitched outlet arrangements are configured to order. North American units carry NEMA outlets.

8
star-grounded outlets; four with RF filters, four without, for power amplifiers
500 W
parallel compensation amplifier that cancels DC on the mains without limiting current
−60 dB
RF attenuation at 100 kHz; −20 dB at 20 kHz, −6 dB at 2 kHz
37.5 lb
weight (17 kg); 19 in wide, 6.1 in tall

Authorized Burmester dealer · Delivery and installation by Pearl Audio · Trade-ins welcome

The story

The 948 came out of a question Burmester's engineers set themselves: why does the same system sound different at different times of day. The answer they settled on was a small direct-current voltage, a few millivolts to a few hundred, superimposed on the alternating mains and varying with what else is drawing from the grid, from half-wave rectified loads in the house to industrial equipment on the same transformer. DC on the mains pushes the core of every transformer in the system toward saturation on one half of the cycle, which raises distortion in the supply, increases the noise the transformer radiates and makes it hum. Most conditioners deal with the problem by putting something in series with the load, a filter, an isolation transformer or a regenerating amplifier, and every one of those limits the current a large power amplifier can draw on a transient. Burmester's patented approach removes the series element.

Inside the 948 is a 500 W power amplifier whose output is connected in parallel with the mains supply rather than in its path. It measures the DC component and injects an equal and opposite voltage, so the DC is cancelled at the outlets while the alternating current flows from the wall to the connected equipment through nothing more than the star-connected wiring. Burmester's specification line is active DC compensation without power limitation, and the point is practical: a 218 or a 259, or a pair of 159s, can be plugged into the 948 rather than run from a separate wall socket. The compensation is switched from the front panel and protected against overheating; the display shows the incoming AC voltage or, at the press of a button, the DC content in millivolts, which drops to about zero when the circuit is active, so the owner can see what the unit is doing.

The eight outlets are star-grounded, with the protective earth also star-connected so that no outlet's ground current flows through another's, and the mains phase is marked on every socket and on the inlet so that each component can be oriented the same way. Two RF filters with steep slopes, about −6 dB at 2 kHz, −20 dB at 20 kHz and −60 dB at 100 kHz, serve the filtered outlets; in the standard configuration Mains Out 1 and 2 are filtered for sources and preamplifiers and Mains Out 3 and 4 are unfiltered, which is where Burmester recommends power amplifiers go, and the arrangement of filtered and switched outlets can be specified when ordering. A 10 V DC trigger input lets a Burmester preamplifier or DAC switch the conditioner on with the system. Total connected load is rated at 2,000 W; the unit itself draws 10 W switched on and 8 W in standby.

Burmester's claim for the result is consistency: the loss of focus and ease that owners notice in the evening or on weekdays is reduced because the DC that caused it has been removed, and transformer hum in the connected equipment falls with it. We have not found an independent review of the 948 in a major publication, and we will not characterize its effect beyond what Burmester publishes; it is the one component in a Burmester system whose contribution can be judged in a few minutes, by switching the compensation off and on from the front panel while the display shows the DC it is removing, and that is how we show it.

In a system the 948 is sized for a complete installation: a source, a preamplifier, two mono or stereo power amplifiers and a turntable or server leave outlets to spare, and because the current path is direct there is no reason to run the amplifiers from the wall. Burmester specifies it for every line, from a 101 or 232 integrated through the 035 and 088 preamplifiers with 036, 956 MK2 or 216 power amplifiers to the 218, 259 and 159. It is equally at home in front of Luxman, McIntosh, Pass Labs or Audio Research electronics, and we use it with Nordost and AudioQuest power cables from the wall. It fits a standard 19-inch rack shelf at 6.1 inches tall in Burmester's chrome and silver finish.

Each technology below is explained in depth in the Burmester technology library; the Burmester story follows the company from the 777 of 1977 to the new Reference Line.

Key technologies

  • Active DC compensation. A patented 500 W amplifier in parallel with the mains measures the DC component and injects its inverse, cancelling it at the outlets without a series element; switchable, with thermal protection.
  • Direct current path. Nothing sits between the wall and the outlets, so there is no power limitation; large power amplifiers can be connected.
  • Two RF filters. Steep-slope filters on the filtered outlets: about −6 dB at 2 kHz, −20 dB at 20 kHz and −60 dB at 100 kHz.
  • Star grounding. Eight outlets with star-connected ground and a star-grounded protective earth.
  • Phase marking. Mains phase indicated on every outlet and on the inlet for consistent polarity across the system.
  • AC and DC display. Front-panel readout of the incoming AC voltage or the DC content in millivolts, which falls to about zero with compensation active.
  • Configurable outlets. Filtered or unfiltered and switched or unswitched outlets specified at ordering; standard units have four of each filter type.
  • Trigger switching. 10 V DC input for remote power-up from a Burmester preamplifier or DAC.

Every Burmester system at Pearl Audio is demonstrated through the 948; hear it feeding the 808 MK5 and 218 in our Portland showroom.

Finishes

  • Silver brushed aluminum housing with chrome-plated front panel

The 948 is supplied in Burmester's chrome and silver finish. North American units carry NEMA outlets; Burmester's product photographs show the European version.

Specifications
Type Power conditioner with patented active DC compensation and RF filtering; no series power limitation
Outlets 8, star-grounded; NEMA for North America
Standard configuration Mains Out 1 and 2 filtered (4 outlets); Mains Out 3 and 4 unfiltered (4 outlets) for power amplifiers; switched and unswitched arrangements to order
DC compensation 500 W amplifier in parallel with the mains; switchable from the front panel; thermal protection with automatic shutdown and TEMP indicator
RF filtering 2 filters: approximately −6 dB at 2 kHz, −20 dB at 20 kHz, −60 dB at 100 kHz
Grounding Star-connected outlet grounds and star-grounded protective earth
Phase indication Marked on all outlets and on the mains inlet
Display Incoming AC voltage (V) or DC component of the mains (mV); switchable off
Maximum connected load 2,000 W total (Burmester owner's manual); current rating not published by Burmester
Mains voltage 100 – 127 V or 200 – 240 V, 50/60 Hz, set at the factory
Fuses (100 – 127 V) 2 × 3.15 A slow-blow; 3 × 250 mA slow-blow
Power consumption 10 W on; 8 W standby
Remote 10 V DC trigger input (1 in, 0 out); cable not supplied
Dimensions (W × H × D) 19.0 × 6.1 × 14.5 in (482 × 153 × 368 mm); the 2010 owner's manual quotes 482 × 155 × 400 mm
Weight 37.5 lb (17 kg); the 2010 owner's manual quotes 13 kg
Finish Silver with chrome-plated front panel
Warranty Not published by Burmester on the product page; ask us for current North American terms
Made in Berlin, Germany
Sold as Single unit; power cable from the wall not included

Burmester 948 product page and specifications

Where it sits in the range

Burmester's only power conditioner, specified for every line; the components it feeds, ordered by price.

Power amplifiers of any size, including the 218 and 259, go on the unfiltered outlets; the 035 or 088 preamplifier can switch the 948 through its trigger input.

Plan your Burmester system with Pearl Audio

Pearl Audio is an authorized Burmester dealer. Ask us to arrange an audition in our Portland showroom, where we switch the 948's compensation in and out of a system while its display shows the DC it is removing, so you can judge the effect yourself. Call (503) 222-2599 or email sales@pearlaudio.com.

Signature technologies

The engineering behind the Burmester 948 Power Conditioner

Burmester gives its technologies names because each one solves a specific problem. Here is what each does, where it came from, why it matters in a system, and what you may hear.

Made in Germany since 1977Since 1978

Chrome, and hand assembly in Berlin

Since the 785 of 1978 every Burmester has worn a mirror-polished chrome front, and every unit is still developed, hand-assembled, measured about three hundred times and burned in for seven days at the company's own factory in Berlin-Schöneberg. Read the deep diveClose

What it does

Burmester develops each product in-house from the first sketch to the shipped unit, sources more than 95 percent of its parts and sub-assemblies from German manufacturers, and assembles everything by hand in Schöneberg, where it has been since 1977. A finished component is put through about three hundred computer-aided measurements before and after a seven-day burn-in, then a functional and a listening check; a 909 MK5 takes about a hundred hours to build. The factory was rebuilt and modernized in 2023 with production brought back fully in-house, and the company keeps spare parts for every product it has ever made. The chrome front panel, introduced on the 785 preamplifier in May 1978, is the visual promise of all that; the 232 of 2023 kept it while introducing a new enclosure and display language.

Why it matters in a system

The measurement-and-burn-in regime is why a Burmester arrives working to specification and why units from the 1980s are still serviced in Berlin. For an owner it means a component bought as a long-term piece, which is how Burmester intends its products to be used.

What you may hear

Not a sound of its own, but reviewers consistently cite the build: What Hi-Fi? on the 808 MK5 noted exceptional build and finish, and John Darko described the factory as a meticulous, clean environment. Burmester is a founding member of the Initiative Deutsche Manufakturen.

Oversized supplies, and DC cancelled on the mainsSince 1994

Power supplies and the 948

Every Burmester amplifier is built around a large, low-impedance linear power supply, and the 948 power conditioner of 1994 protects the whole system with a patented parallel circuit that cancels DC on the mains without putting anything in series with the power amplifiers. Read the deep diveClose

What it does

Burmester rates its amplifiers conservatively and lets the power supply set the limit: the 218 uses an ultra-low-noise toroidal transformer with an oversized linear supply and low-impedance current paths, the 216 carries a 437 VA transformer and 200,000 microfarads of filter capacitance for a 100-watt rating, the 159 gives each channel its own supply, and the 249 preamplifier runs from an external supply for near-silent operation. The 948 approaches the mains from the other side. Even a few millivolts of DC on the line can drive a large transformer toward saturation and make it hum; the 948 measures the average of the supply voltage and adds load to the stronger half-cycle until the two halves balance, an active circuit Burmester describes as a 500-watt amplifier running in parallel with the mains, so nothing limits the current to the amplifiers. Two of its eight phase-marked outlets carry steep radio-frequency filters for digital sources; the power amplifiers go on the unfiltered ones.

Why it matters in a system

An amplifier's grip on a loudspeaker is only as good as its supply, and a transformer saturated by DC is both noisy and weak. The supply is why Burmester's big amplifiers are stable into one ohm, and the 948 is why they sound the same at nine in the evening as at three in the morning.

What you may hear

Burmester claims a more open sound, better presence and a sweeter balance from the 948, and a system less affected by the time of day. Stereophile measured the 218 at 170, 272 and 480 watts into 8, 4 and 2 ohms against a rating of 165, 275 and 400. Stefan Größler on why the supply matters: a weak one "prevents you from hearing the start of transitions from loud to soft passages."

All Burmester technologies and the company story

The Burmester story

A bass player's amplifier company: balanced, DC-coupled, chrome-fronted, and hand-built in Berlin since 1977.

Founded 1977 in Berlin-Schöneberg, Germany, where every Burmester is still built by Dieter Burmester · burmester.de

Milestones

  1. 1977 The 777, and a company born in Schöneberg Dieter Burmester, an engineer building medical measurement electronics and a rock bassist on weekends, replaces his failing Quad tube amplifier with a preamplifier of his own in July 1977. About twenty 777s are built by hand; a magazine review brings the dealers.
  2. 1978 Chrome arrives: the 785 The 785 preamplifier of May 1978 establishes the mirror-chrome front panel that identifies every Burmester since. Burmester Audiosysteme is fully established the same year.
  3. 1980 The 808, the first modular preamplifier Launched in August 1980 with plug-in input and output modules and an external supply; in continuous production ever since, now as the 808 MK5.Burmester 808 MK5 Preamplifier
  4. 1983 The first balanced power amplifier Burmester brings fully symmetrical circuitry to home audio. Dieter Burmester had been a founding member of Germany's High End society two years earlier.
  5. 1987 DC coupling from phono stage to loudspeaker The first amplifier chain with no coupling capacitors anywhere in the signal path, and the first remote-controlled relay-switched volume.
  6. 1990 The 909 The 909 stereo power amplifier, stable into one ohm and supervised by a processor, is the flagship until the 159 and the basis of every later Burmester power amplifier; it is still made as the 909 MK5.
  7. 1991 The first belt-driven CD player Turntable thinking applied to the disc: a belt from a separate motor drives a platter on a precision bearing. The drive has been built by hand in Berlin ever since, in the 969, the 069 and the 089.
  8. 1994 The 948 power conditioner A patented parallel circuit that cancels DC on the mains without limiting current to the amplifiers, still in production. Burmester also builds its first loudspeakers in 1994 and 1995.
  9. 2005 Into the car: the Bugatti Veyron Burmester's first automotive system goes into the Veyron 16.4, the beginning of partnerships with Porsche (2009), Mercedes-Benz (2013) and Ferrari (2022).
  10. 2007 Thirty years: the 069 and 077 The 069 belt-drive CD player and the 077 Reference preamplifier, with X-AMP 2 inside, define the modern Reference Line on the thirtieth anniversary of the 777.
  11. 2011 The 100 Phono A fully balanced, modular phono stage with X-AMP gain and an optional analog-to-digital converter; the basis of the phono stages in Burmester's later turntables.Burmester 100 Phono
  12. 2012 The 111 Musiccenter CD ripper, library, streamer, DAC and balanced preamplifier in one box, a decade ahead of most of high-end audio on computer-based music. The 151 follows in 2015. In 2013 the Mercedes S-Class launches with Burmester 3D surround as standard.Burmester 111 Musiccenter
  13. 2015 Dieter Burmester dies; Marianne Burmester leads Dieter Burmester dies on August 15, 2015, at 69. The company passes to his widow Marianne, with Stefan Größler as technical director, and sets a course of evolution rather than revolution.
  14. 2017 Forty years: the 175 turntable Burmester's first turntable, the 175, and the Phase 3 all-in-one system mark the anniversary; Andreas Henke becomes co-chief executive.
  15. 2018 The Signature Line: 159 and BC350 The 1,200-watt 159 monoblocks, seven years in development, and the BC350 loudspeakers open a line above Reference.Burmester 159 Amplifier (pair)
  16. 2021 BC150, 217, and a new generation of amplifiers The BC150 loudspeaker and 217 turntable arrive in 2021 and the 216 and 218 power amplifiers in 2022, with the 159's heat-pipe cooling inside.Burmester 218 Amplifier
  17. 2023 The 232, and new leadership The 232 integrated introduces a new design language with app control; from January 2024 co-chief executives Thorsten Poenig and Thomas Schneider lead the company, with the Burmester family as owners. The modular BX100 loudspeaker follows in 2024.Burmester 232 Streaming Integrated
  18. 2025 An all-new Reference Line At Munich in May 2025 Burmester shows the 249 preamplifier, 257 turntable and 259 power amplifier on X-AMP 3, all-new designs that borrow nothing from the previous generation.Burmester 259 Amplifiers
Read the Burmester story
Burmester

Dieter Burmester never set out to build a hi-fi company. Born in Austria in 1946 and raised in Lüchow in Lower Saxony, he was on stage with rock bands from the age of fifteen, playing bass and guitar every weekend across northern Germany, and he came to Berlin in 1968 to study electrical engineering. By 1977 he was running a small engineering office in Berlin-Schöneberg designing circuitry for medical measuring instruments. What pushed him toward audio was frustration: his Quad tube amplifier kept failing. In July 1977 he applied the precision parts and circuit discipline of his medical work to a solid-state preamplifier and called it the 777, for the month and the year. He built about twenty by hand for friends; a German magazine praised it, dealers called, and when a local bank refused him a loan on the grounds that the business could not work, he found he did not need one.

The look arrived almost at once. The 785 preamplifier of May 1978 introduced the mirror-polished chrome front that has identified every Burmester since. The engineering foundations followed in quick succession: in August 1980 the 808, the first modular preamplifier, with plug-in cards that let an owner add phono or balanced inputs years later, a component that has never left production and is sold today as the 808 MK5; in 1983 fully balanced circuitry, brought to home audio for the first time; in 1987 the first amplifier chain that was DC-coupled from the phono stage to the loudspeaker terminals, with no capacitors anywhere in the path. The 909 stereo power amplifier of 1990, stable into one ohm, supervised by a processor and built around an outsized supply, became the template for every Burmester power amplifier since. Dieter Burmester was a founding member of Germany's High End society in 1981, and his description of the enterprise was plain: high-end audio is "a means of transporting musical emotions; nothing more, but also nothing less."

Burmester treated digital as a mechanical and analog problem first. In 1991 the company introduced the first belt-driven CD player, decoupling the disc and laser from the motor as a turntable does, with a bearing it has machined and hand-assembled in Berlin ever since; the 969 and 970, the 069 of 2007 and the 089 of 2010 all descend from it. In 1994 came the 948 power conditioner, a patented circuit that cancels DC on the mains in parallel, with nothing in series with the amplifiers, and still in the catalog. Loudspeakers followed in 1994 and 1995. In the 2000s the X-AMP discrete gain module became the common building block of Burmester's phono stages, preamplifiers, DACs and power amplifiers, and the 111 Musiccenter of 2012, a CD ripper, library, streamer, DAC and balanced preamplifier in one chrome box, put the company a decade ahead of most of high-end audio on computer-based music; the 151 and 151 MK2 brought the platform to the Top Line.

Around 2005 Burmester did something no serious high-end company had done and built a sound system for a car, the Bugatti Veyron. The design was adapted for the Porsche Panamera of 2009, beginning a partnership that now spans the Cayenne, Macan, 911, 718 and Taycan; Mercedes-Benz followed with the 2013 S-Class, the first luxury sedan with 3D surround as standard, then the Maybach, and Ferrari's Purosangue joined in 2022. The automotive work was controversial inside the industry at the time, but it funded the company's growth and fed back into the home products in resonance control and driver design. Through it all Burmester stayed in the same Schöneberg quarter, hand-building every unit, sourcing more than 95 percent of its parts from German suppliers, and putting each finished piece through some three hundred measurements before and after a seven-day burn-in.

Dieter Burmester died suddenly on August 15, 2015, at 69, still playing guitar in his office and still the public face of the company. His widow Marianne, who had helped build the business, took over as managing partner with long-time development chief Stefan Größler as technical director, and the course was set as evolution rather than revolution. The fortieth anniversary in 2017 brought Burmester's first turntable, the 175; the Signature Line opened in 2018 with the 1,200-watt 159 monoblocks and the BC350 loudspeakers; the BC150, B38, 216 and 218 followed in 2021 and 2022, and the 232 integrated of 2023 introduced a new design language. Since January 2024 the company has been led by co-chief executives Thorsten Poenig and Thomas Schneider, with Ralf Schmidt heading home-audio engineering, and it remains wholly family-owned. In May 2025 Burmester showed an all-new Reference Line, the 249 preamplifier, 257 turntable and 259 power amplifier, built on X-AMP 3 and borrowing, in the company's words, nothing from the previous generation. Nearly fifty years on, every Burmester is still developed and hand-built in Berlin, still wears chrome, and is still measured against the question Dieter asked in 1977: does it carry the music?

The complete Burmester story and technology library

Burmester at Pearl Audio

Pearl Audio is an authorized Burmester dealer in Portland. Burmester electronics from the Classic Line through the Top Line to the Reference Line are set up and playing in our showroom, with the 808 MK5, 111 Musiccenter and 218 at the top of the rack and the 232, 088, 151 MK2, 216 and 100 Phono beside them, and the Signature Line 159 and the BC loudspeakers available to order. Burmester systems are wired with the company's reversed XLR polarity in mind, delivered and set up by our own staff in the Portland area, and we keep the 948 on the floor so the amplifiers can be heard with the mains cleaned up as Burmester intends.

The Pearl Audio experience

How we work with you

A system at this level should be heard, thoughtfully matched, and properly set up. From the first audition to long-term ownership, you work with the same people, in person.

  1. 01

    Listen first

    Hear the 948 Power Conditioner by appointment in one of our two purpose-designed demonstration rooms, with your own music and time to compare without pressure.

  2. 02

    Delivery and installation

    We deliver and install throughout the Portland area, taking care of placement, connections, ventilation and system configuration ourselves.

  3. 03

    Support for as long as you own it

    We support everything we sell for as long as you own it, whether the answer comes by phone, in your home, or through factory service.

  4. 04

    A path for what comes next

    Trade-in assistance and qualifying 100% Trade-Up options give you flexibility when your listening priorities or your system change.

Search