GRUENSCH GRAND REFERENCE



GRUENSCH GRAND REFERENCE is the ultimate reference speaker and our homage to the beauty and fascination of music.

Years of fundamental research and development form the basis for this technologically and sonically outstanding reference loudspeaker.
A unique, holistic technical concept was combined with an impressive, acoustically-ideal and elegant design to create a total work of art. Passion, deep musical understanding and decades of listening experience have made GRAND REFERENCE what they are today: Musical masterpieces of loudspeaker art.

GRUENSCH GRAND REFERENCE - Experience music as pure emotion - holistic and lifelike without limitation.

 

THE UNIQUE, HOLISTIC SPEAKER CONCEPT.

  • GRUENSCH TCPS PLANAR UNIT - Central planar unit as a virtually zero mass Time-Coincident Point Source with dipole technology from the medium low midrange onwards -
    consisting of two midrange planar magnetic transducers, one mid-high planar magnetic transducer and one ribbon super-tweeter - in a special open baffle setting
  • GRUENSCH OPEN BAFFLE – Sophisticated open baffle with special rear diffusor elements for optimised, natural, diffuse sound field
  • GRUENSCH SINGLE DRIVER WIDE RANGE CONCEPT-
    Broadband concept - The most important frequency ranges from the medium midrange to 15 kHz (more than four octaves) is reproduced absolutely seamlessly by a single broadband planar magnetic transducer.
  • TIME COINCIDENT SPEAKER CONCEPT - Time accurate impulse and music reproduction
  • TIME COHERENT CROSSOVER -  Time and phase coherent first-order (6dB/octave) acoustic attenuation slopes
  • Time-aligned in phase driver configuration -
    Time-aligned driver configuration - The aligned drivers are all connected in positive phase so that they push and pull in unison.
  • Symmetrical Vertical Driver Array / Point Source Focus - Mirror-symmetrical vertical drive unit array as quasi-point source
  • Driver Complement:
    1x Ribbon-Supertweeter, 1x broadband 20cm (8”) Planar Magnetic Transducer (midrange/treble), 2x 25cm (10”) Planar Magnetic Transducer (midrange), 2x 22cm (8.5”) Bass, 1x 38cm (15”) Sub-bass Transducers selected in pairs.
  • GRUENSCH ULTRA LOW LOSS CONCEPT
    1) Speaker drivers with minimum mechanical losses 2) Ideal, direct operation of the mid-high planar magnetic transducer without series resistor 3) Crossover topology with minimum time delay (no time smear) and use of particularly low-loss components
  • GRUENSCH SEALED ENCLOSURE - Sealed enclosures in bass and sub-bass range for best impulse reproduction with optimized pressure conditions and prevention of backwave colorations
  • Active 15’’ Sub-bass - Active 38 cm (15”) sub-bass in the frequency range from 15 Hz to 50 Hz with separate electronic crossover and external power amplifier
    (Required separate external poweramplifier not included in the scope of delivery)
  • Ultra Solid and Inert Cabinet - Exceptionally solid, multilayer, pressure- and resonance-optimized cabinet with extensive internal bracing
  • GRUENSCH PURE SOUND WAVE - Self-reflection-free sound radiation thanks to special design of cabinet and speaker driver environment
  • LINEAR OCTAVE-TO-OCTAVE RADIATION - Evenly and proportionately increasing membrane surface area to low frequencies
  • Large Membrane Surface Area - Very large total speaker membrane surface area, especially in the mid and high frequency range
  • GRUENSCH STEALTH CABINET - Acoustically "invisible" cabinet with minimal acoustic signature
  • Extremely Tight Tolerances and Highest Precision - Strict pair selection of loudspeaker drivers and very accurate matching of left and right speakers

 

 


UNIQUE ACOUSTIC PROPERTIES.

  • TIME COINCIDENCE AND WAVEFORM INTEGRITY - Time accurate music reproduction that preserves the integrity of the recorded waveform and the timing relationships between ranges of frequencies (Ideal step response and squarewave response)
  • PHASE COHERENCE - Flat acoustic phase response and minimum phase shifts. The aligned drivers are all connected in positive phase so that they push and pull in unison.
  • PERFECT TRANSIENT RESPONSE - Ideal, very fast and time coincident transient response and therefore no smearing of the music signal over time
  • FAST SPECTRAL DECAY / MINIMUM ENERGY STORAGE - Minimum energy storage resulting in an exceptionally even and fast spectral decay
  • ULTRA WIDE FREQUENCY RANGE - Exceptionally wide frequency range of 15 Hz - 100.000 Hz (-3 dB) and thus complete reproduction of the entire music spectrum with all harmonics and deepest spatial cues (true full range)
  • Amplifier Friendly Impedance Characteristics - Due to the uncritical impedance curve it is an easy load for an amplifier to drive.
  • IDEAL DISPERSION CHARACTERISTICS - Ideal dispersion characteristics for better imaging and less coloration from the environment. Very wide and even horizontal dispersion and limited vertical dispersion, so that floor and ceiling reflections are minimised.
  • TRULY REALISTIC AND NATURAL IMAGING - Precise positioning and impressively natural reproduction of scale and space
  • NATURAL SOUND FIELD - Optimized diffuse sound field for particularly natural, large and free spatial representation and immensity of the soundstage in every direction
  • SEAMLESS SONIC REPRODUCTION - Seamless, homogeneous reproduction, since the range from the middle mid-range up to 15.000 Hz is reproduced by a single planar magnetic transducer, so that there is no transition from one chassis to the other, especially in the highly sensitive acoustic range of 2 kHz to 5 kHz.
  • ULTRA LOW DISTORTION - Extremely low harmonic distortion in each frequency range and at all volumes
  • NATURAL SPECTRUM - Ideal, natural and harmonic distortion spectrum  with perfect musical characterisics (ideally predominantly second harmonic in nature with rapid decrease of high order harmonics k2>k3 etc.)
  • ULTRA HIGH RESOLUTION - Maximum high resolution and detail reproduction
  • WIDE RANGE OF DYNAMIC CONTRASTS - Enormous fine dynamics and high overall dynamics due to extremely low-loss loudspeaker drivers and very large overall membrane area
  • High Sensitivity - High sensitivity of 91 dB/2.83V/m
  • TONAL FIDELITY - Absolute fidelity in terms of tonality and timbre
  • PERFECT BASS -  Perfect bass reproduction in any listening room thanks to selad enclosures and adaptation of sub-bass range to the listening room via active crossover
  • Diffraction and Reflection Free Radiation -
    Diffraction and reflection free radiation and thus exceptionally natural purity of sound
  • SONIC HOLOGRAPHY - Complete detachment of the sound image and holographic three-dimensionality through acoustically "invisible" and non-locatable cabinet; the speakers fully disappear sonically.

 

The unique technical concept and the resultant qualities serve only one purpose and then completely disappear behind the result: perfect musical enjoyment as a uniquely inspiring and fulfilling human experience.
 

GRUENSCH GRAND REFERENCE

 

GRUENSCH GRAND REFERENCE offers you a previously unattained musical experience and stands out in its sonic qualities even from the best previous loudspeaker concepts.

 

OVERWHELMING SOUND.

  • Natural, homogeneous and musical sound as an integrated whole
  • Powerful, voluminous and dynamic
  • Excellent spatial imaging, positioning and tangibility
  • Best fine dynamics and explosive, unlimited overall dynamics
  • Astoundingly realistic and almost holographic soundstage presentation with enormous depth and width
  • Exceptionally high sound purity, ease and speed of reproduction
  • Pulse-accurate, powerful and vivid
  • Excellent voice reproduction in size and body as well as timbre and expression
  • Lifelike immediacy and sovereignty with excellent rhythm and timing
  • Luminous, finely graduated timbres
  • Extremely finely resolved, silky highs with breath-taking richness of overtones and finest decay of notes
  • Enormous detail resolution and transparency even at low volumes
  • Fast and taut as well as agile and colourful bass
  • Majestic, pitch-black deep bass with punch and precision
  • Lifelike representation of instruments on a three-dimensional sound stage completely detached from the loudspeakers
  • Airy and free - effortless and unleashed
  • Emotionally touching and captivating reproduction of music in perfect beauty and harmony, providing deep insights into the character and soul of music

 

But words can only begin to describe what happens in reality when you experience music through these exceptional speakers for the first time. Expect an overwhelming and comprehensive musical experience that can only be surpassed by a live concert.

 

DESIGN AND MANUFACTURE.

Only the best and finest materials are used for GRAND REFERENCE.

The luxurious overall composition of high-gloss lacquered and hand-polished loudspeaker cabinet, velvety matt Nextel-coated elements, Alcantara inlays as well as silver anodised and polished aluminium elements captivate through visual tension, sensuality and timeless beauty.

Each pair of GRAND REFERENCE loudspeakers are manufactured in Germany with the greatest care and appreciation for the product. In countless working hours, exclusive and ground-breaking masterpieces of loudspeaker construction are created with the finest craftsmanship.


 

GRUENSCH GRAND REFERENCE

THE NEW BENCHMARK IN ULTRA HIGH END SPEAKERS.

ENGINEERED AND HANDCRAFTED IN GERMANY.


 

GRUENSCH GRAND REFERENCE

 

 

TECHNICAL SPECIFICATIONS.
Typical Values

 

Measurements

 

 

 

Frequency Range

 

15 Hz - 100.000 Hz (-3dB)

 

Sensitivity

 

91 dB (2,83V/1m)

 

Nominal Impedance

 

7,1 ohms - Minimum 3,0 ohms / 2500 Hz

 

 

 

Subbass 4,0 ohms

 

 

 

 

 

Time Domain Accuracy /
Impulse Response

 

Time Coincident / Correct Impulse Response

Preserving the timing relationships between ranges of frequencies (Time Accuracy)

Preserving the integrity of the recorded musical waveform (Waveform Integrity)

Step response GRUENSCH GRAND REFERENCE

Ideal Step Response

Perfect Square Wave Response

 

 

 

 

 

Filters

 

 

 

Passive Crossover

 

Time Coherent first-order (6dB/octave) acoustic attenuation slopes
within the frequency range of human hearing

 

Active Sub-bass Crossover

 

External Active Crossover for Sub-Bass with analog volume control and optional room adjustment
(Required separate external poweramplifier not included in the scope of delivery)

 

 

 

 

 

Driver Complement

 

 

 

GRUENSCH TCPS PLANAR UNIT

 

Time Coincident Point Source Planar Unit consisting of:

 

Supertweeter

 

25mm Ribbon-Supertweeter, special diaphragma with virtually zero mass (ribbon thickness 0,006mm), neodymium magnet system and sophisticated transformer

 

Midrange/Tweeter

 

1x nearly zero mass and extremely broadband 20cm (8”) Planar Magnetic Transducer with patented diaphragm and symmetric push-pull-Neodymium magnet system,  mounted in an open baffle in dipole configuration with special sound diffusion elements at the rear

 

Midrange

 

2x nearly zero mass 25cm (10”) Planar Magnetic Transducer with patented diaphragm, symmetric push-pull-Neodymium magnet system and extremely large surface area, mounted in an open baffle in dipole configuration with special sound diffusion elements at the rear

 

 

 

All transducer are time-aligned and mounted in a massive plate (15mm) milled from solid aluminium, that is resonance-optimized and reflection-free due to sophisticated acoustical damping.
All transducers are carefully selected in pairs.

 

Bass

 

2x 22cm (8.5”) Bass with Nextel coated paper pulp membrane and  brass phase plug in D’Appolito configuration, GRUENSCH Sealed Enclosure with optimized pressure conditions and prevention of backwave colorations

 

Sub-bass

 

1x 38cm (15”) Sub-bass, exponential polymer composite membrane stiffened with mineral dust, GRUENSCH Sealed Enclosure

 

 

 

 

 

Passive Crossovers

 

Two physically and electrically separated passive crossovers, mounted in separate housing chambers

 

Crossover
GRUENSCH TCPS PLANAR UNIT
(Midrange/Treble)

 

Components of highest quality laboriously point-to-point wired and mounted on a resonance optimized composite plate (massive plate milled from solid aluminium / MPX wood).

 

Crossover Bass

 

Components of highest quality laboriously point-to-point wired and mounted on a resonance optimized composite plate (massive plate milled from solid aluminium / MPX wood).

 

 

 

 

 

Active Crossover Sub-bass

 

External Active Crossover for sub-bass with analog volume control and optional room adjustment
(Required separate external poweramplifier not included in the scope of delivery)

 

 

 

 

 

Wiring Methods

 

 

 

Midrange-Trebel

 

WBT Nextgen Pure Copper Pole Terminals, nickel-free gold plated,
suitable for banana plug (4mm) or spades (6-8mm)

 

Bass

 

WBT Nextgen Pure Copper Pole Terminals, nickel-free gold plated,
suitable for banana plug (4mm) or spades (6-8mm)

 

Sub-bass

 

WBT Nextgen Pure Copper Pole Terminals, nickel-free gold plated,
suitable for banana plug (4mm) or spades (6-8mm)

 

 

 

 

 

Cabinet

 

Luxurious overall composition of high-gloss lacquered and hand-polished loudspeaker cabinet, velvety matt Nextel-coated elements, Alcantara inlays as well as silver anodised and polished aluminium elements.

 

 

 

 

 

 

 

MADE IN GERMANY.

 

 

 

 

 

Weight

 

 

 

Unpackaged per channel

 

approx. 200 kg (441 lbs)

 

Shipping weight per channel

 

approx. 316 kg (697 lbs)

 

 

 

 

 

Overall Dimensions

 

See also graphical drawing below

 

Height

 

155,5 cm (61,2”)

 

Width

 

34,7 cm (13,7”) at the top, 50,1 cm (19,7”) at the bottom

 

Depth

 

65,0 cm (25,6”)

GRUENSCH GRAND REFERENCE Dimensions

All features and specifications are subject to change without notice.

© GRUENSCH Audiotechnik 2018