What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





JMlab Chorus 707 loudspeakers


Specifications
Type:  2-way bass reflex stand mounting loudspeaker
Drivers:
LF : 7" Polyglass cone  mid-bass with 1" double coil
HF :  1" Treated Titanium inverted dome tweeter with 3/4" coil
Low Frequency (-6 dB)point):  45 Hz
Frequency Response:  54 Hz - 22,000 Hz ±3 dB
Efficiency (2,8 V/1 m):  91,5 dB
Nominal Impedance:  8 Ω
Minimum Impedance:  3,6 Ω
Crossover Frequencies:  2400 Hz
Maximal Power Handling with Musical program:  100 W
Recommended Amplifier:  25 - 80 W
Dimensions (H x W x D):  490 x 230 x 310 mm
Net Weight:  10,2 kg
Cabinet Finish:  Black Ash, Cherry, Calvadob
Front Cover:  Black acoustically transparent cloth
Port:  one front circular port
Positioning / Accesories:  On shelves or on L40, L60 stand
Rear Connectors:  Two pair of gold plated binding posts

JMlab Chorus 706 loudspeakers


Specifications
Type:  2-way bass reflex bookshelf loudspeaker
Drivers:
LF : 6,5" Polyglass cone  mid-bass with 1" coil
HF :  1" Treated Titanium inverted dome tweeter with 3/4" coil
Low Frequency (-6 dB)point):  50 Hz
Frequency Response:  57 Hz - 22,000 Hz ±3 dB
Efficiency (2,8 V/1 m):  89,5 dB
Nominal Impedance:  8 Ω
Minimum Impedance:  4 Ω
Crossover Frequencies:  2400 Hz
Maximal Power Handling with Musical program:  75 W
Recommended Amplifier:  22 - 60 W
Dimensions (H x W x D):  370 x 200 x 260 mm
Net Weight:  6,2 kg
Cabinet Finish:  Black Ash, Cherry, Calvados
Front Cover:  Black acoustically transparent cloth
Port:  one front slotted port
Positioning / Accesories:  On shelves or on L60 stand
Rear Connectors:  Single pair of gold plated binding posts

JMlab Chorus 705 loudspeakers


Specifications
Type:  2-way bass reflex bookshelf loudspeaker
Drivers:
LF : 5,5" Polyglass cone  mid-bass with 1" coil
HF :  1" Treated Titanium inverted dome tweeter with 3/4" coil
Low Frequency (-6 dB)point):  60 Hz
Frequency Response:  67 Hz - 22,000 Hz ±3 dB
Efficiency (2,8 V/1 m):  88,5 dB
Nominal Impedance:  8 Ω
Minimum Impedance:  4,1 Ω
Crossover Frequencies:  2400 Hz
Maximal Power Handling with Musical program:  60 W
Recommended Amplifier:  15 - 50 W
Dimensions (H x W x D):  300 x 182 x 207 mm
Net Weight:  4,3 kg
Cabinet Finish:  Black Ash, Cherry, Calvados
Front Cover:  Black acoustically transparent cloth
Port:  one front slotted port
Positioning / Accesories:  On shelves or on L60 stand
Rear Connectors:  Single pair of gold plated binding posts

Audio Note P2 SE power amplifier


The P2 SE is a pure Class A, single-ended amplifier. Its development is the result of Audio Notes ongoing research to find ways to make better audio products. A side from the six key features on which the design is based, atechnique called "Comparison by Contrast" is used to ensure that the product is developed with the most important specification of sound quality as the overriding factor.
The P2 SE design is derived from the Audi Note 's key technological features originally embraced by the On Gaku and kegon amplifiers.
These features include:
Pure Class A operation
Zero negative feedback
Single-ended output stage
Valve rectification
Directly heated, triode output stage.

Pure Single-ended operation.
The P2 SE is a single ended amplifier. This means that the complete music wave form reproduced by the amplifier is preserved as one "whole". Consequently, a true single-ended amplifier must be pure class A and operates in a coherent and natural way.
This produces significant sonic advantage compared to convetional push-pull amplifers since push-pull amplifers demand that a new "mirror" image wave form be created for the topology to work. Creating this perfect mirror image of the original wave form is rather a tall order and far from the only problem associated with push-pull amplifiers.

The stage uses one 6SL7 dual triode per channel. These tubes are connected in a SRPP method and this stage generates most of the required gain.
Since the amplifier is single-ended, no complex phase splitting circuitry is required and the signal from the 6SL7 tubes can be coupled to the output stage. Here, Audio Note aluminium foil, paper in oil capacitors are used instead of the inferior quality film types used so commonly in the audio industry.
The final output trasformers (one of the most critical components in a vacum tube amplifer) are of custom Audio Note design and provide previously unavailable performance characteristics. These transformers use massive cores to reduce saturation effects. This allows the P2 SE to produce impressively extended and controlled bass performance.

Specifications:
Maximum Output:  18 Watts RMS per channel into 4 or 8 Ω loads
Tube Compliment:  4 x 6L6 / 5881;  2 x 6SL7
Input Impedance:  100 k Ω
Power Consumption:  165 VA
Fuse Ratings:  2 A anti-surge (110 to 120 V supply);  1,2 A anti-surge (220 - 240 V supply)
Dimensions (W x H x D):  300 x 140 x 410 mm
Weight:  19 kg

Technics SB-T40 loudspeakers


Flatter Your Ears
But it takes more than an inventive new enclosure to build a speaker for the future - after all, it's what's inside the box which ultimately determines what comes out. And that's where Technics engineers really concentrated their efforts. The result is the honeycomb disc driver.

Why Flat is Better
The tradiional speaker driver is shaped like a cone - and it sufers from an inherent form of distortion called the cavity effect. All cone drivers are prone to the cavity effect, which results from sound waves colliding with each other as they emanate from the diaphragm surface. The resulting standing wave distortion caauses peaks and dips in the frequency response and degrades sound quality. The only way to defeat the cavity effect is to eliminate the cavity - that is, to construct a flat diaphragm. Which brings us to the Technics honeycombdisc. Not only is it flat but it is also axially symmetric - it is equally rigid at all points and in all directions. And it featurs nodal drive, which substantially eliminates partial vibrations and assures a wide range of pistonic diaphragm motion.
The Technics honeycomb features an ideal combination of rigidity and flexibility. It is fast enough to respond to delicate nuances in the high range, yet strong enough to avoid partial vibration.
Plus, the flat driver means inherent phase linearity, since all the acoustic centers are aligned in the same plane. Once, we had to stagger the drivers to achieve phase linearity. But with today's honeycomb disc technology, the drivers can be mounted on the same baffle without sacrificing linearity.

Theory into Praactice- Honeycomb Drivers
Woofer
The SB-T40 features a 22 cm (9"woofer} low frequency driver. The woofer are powered by large magnets with high output and use voice coil designed for linear response.
A carefully formulated polyamide adhesive secures the voice coil and the polyimide film bobbin is fiber reinforced - together, they can withstand extreme temperatures of 250°C. the result is excellent power handling characteristics.
Midrange
Efficiency and smooth response -  thes are the desired traits of a midrange driver. Technics uses the same heat-resistant materials that the woofer features in the midrange, to improve power handling. The cloth edge construction ensures wide, smooth response, while narrow magnetic gaps in the voice coil yield highly efficient operation.
Tweeter
If a tweeter can maintain response all the way up to 35 kHz, you can believe that high range response is outstanding. Technics uses a magnetic fluid in the circuit gap and a precision acoustic equalizer to achieve this remarkable upper frequency limit - thay also contribute to good heat dispersion, high power handling, and a stable stereo image not limited by "beaming".

Thermal Relay Protection
It's not easy to overload the SB-T40 - but protection is essential, particulrly if the amp or source material creates or exhibits distortion. Under these adverse conditions, overheating could conceivably damage the speaker. So,Technics included a thermal relay protection circuit, which cuts power at the input terminals if an abnormal temperature rise does occur. It is easily resettable using a front panel button, and an LED illuminates to confirm the protection circuit;s operation.

Other Features
Computer designed high density particle board enclosure
Low distortion, low crosstalk crossover networks.
Strong, easy-to-use screw-in type speaker cord connection terminals.
Detachable grille
Tweeter level control

Specifications
Configuration Type:  3-way, 3-speaker bass-reflex
Driver Units:
Woofer 220 mm (9") honeycomb disc
Midrange 52mm (2") honeycomb disc
Tweeter 28 mm (1-1/8") honeycomb disc
Impedance:  8 Ω
Input Power:  91 W music ( 60 W DIN)
Output Level:  90 dB/W/1m
Frequency Response:  32 Hz - 38 kHz (at 16 dB below average level)
40 Hz - 35 kHz (at 10 dB below average level)
Crossover Frequency:  1,800 Hz and 3,500 Hz
Dimensions (W x H x D):  285 x 830 x 255 mm (11-7/32" x 32-11/16" x 9-31/32")
Weight:  13,5 kg (29,8 lbs)

Technics SB-T20 speakers


There are two major categories of speaker design - bookshelf speakers and floor standing speakers. Floor standing models generally provide deeper bass, because the floor itself augmentes the output of the driver. In addition, the increased volume of the speaker box means more air in the enclosure and, consequently, greater compliance. Compliance is an expression of the amount of energy required to move the woofer; in floor standing models, it is quite high and more bass energy is produced. Floor standing speakers also tend to improve high frequency response, because they are usually designed with the tweeter at eye level. This localized tweeter placement, while nothing more than a basic construction technique, dramatically improves the frequency balance in the high range.
If all these advantages are inherent in floor standing speakers, why do speaker manufacturers bother to build bookshelf models? Mostly, for practical reasons - size, space, price and convenience are the most important consideratiions. Bookshelf speakers, as the name implies, can be placed on a shelf. They can also be placed on the floor of course, but for quality reproduction, the added expense of a speaker stand is normally necessary. Bookshelf spaekers are usually smaller than the floor standing variety, less expensive, and much easier to handle. In short, for many listeners, the sonic advantages of floor standing speakers are not worth the added hassle and inconvenience.

The new technics SB-T20 speakers offer the best of both worlds. They are floor standing speakers, but in a sleek, trimmed down package. And their prices are in line with equivalent bookshelf models. With the additional enclosure volume and ear-level high frequency drivers, they deliver sound which is on a par with fine floor standing models. Yet, their futuristic, pillar-like design takes up less space in your listening room or your dance floor. Plus, they are lightweight and easily movable. Technics reputation for innovative design can only be enhanced by our new SB-T20 bass reflex speakers.

Specifications
Configuration Type:  2-way, 2-speaker bass-reflex
Driver Units:
Woofer 180 mm (7") honeycomb disc
Tweeter 28 mm (1-1/8") honeycomb disc
Impedance:  8 Ω
Input Power:  60 W music ( 40 W DIN)
Output Level:  90 dB/W/1m
Frequency Response:  38 Hz - 38 kHz (at 16 dB below average level)
45 Hz - 35 kHz (at 10 dB below average level)
Crossover Frequency:  3,000 Hz
Dimensions (W x H x D):  230 x 755 x 255 mm (9-1/16" x 29-23/32" x 8-27/32")
Weight:  9,5 kg (20,9 lbs)

Pioneer TX-700 tuner

Solid State AM/FM Stereo Tuner with FM Preset Tuning Convenience.
The TX-700 has new FET FM circuitry that gives it improved sensitivity and selectivity am reception is also excellent. With the station presetting feature, up to 5 FM stations will pop in individually at the touch of a button, and manual tuning is convenient, too. The TX-700 also includes a very accurate time-switching type demodulator in the FM multiplex section that provides wide frequency response and natural stereo separation. A full complement of controls and connections make the TX-700 very versatile. It's tuner that is just as much a pleasure to operate as it is to hear.

Features:
New FM Circuitry
FET in the front end of the TX-700 and variable capacitance diodes in the entirely new tuning circuit provide much better sensitivity and selectivity, tuning is easier even in areas of station-crowding.
FM Preset Tuning
With the manual tuning knob OFF, you can preset up to 5 FM stations by means of the individual tuning meters and dial scales. After once presetting, tuning in is quickly accomplished by a simple touch of a push-button.
FM IF Section
The TX-700 incorporates integrated circuits in the FM intermediate frequency section - limiting and capture ratio are much better than in conventional FM stages.
Manual Tuning
With the manual tuning knob ON, AM or FM stations can be tuned very accurately by dialing. For manual tuning, the tuning needle lights up on the dial scale.
FM Multiplex Section
A highly accurate time-switching type demodulator in the multiplex section provides excellent separation and frequency response. The TX-700 also has an FM MPX noise filter to keep noise out of FM stereo reception, a muting switch on the front panel to eliminate interstation noise, and FM mono-stereo automatic selection.
Am Tuner section
The TX-700 has a ferrite loopstick antenna on the rear panel plus connections for a long-wire antenna for improved AM reception.
Output Level Control
In addition to tape recording output terminals, there is an output level control permitting perfect compatibility with other amplifiers.
Styling
The appearance of the TX-700 is clearly, attractively, contemporary. The TX-700 blends particularly well with pre- and main amplifiers Pioneer Model S.C.-700 and SM-700

Specifications
FM Section
Circuitry:
Preset Tuning and Manual Tuning, mechanism employing Varacator (Variable Capacitance Diode)
RF-Amplifier circuit with an FET
Frequency Range:  87,5 to 108 MHz
IHF Sensitivity:  2,2 µV ( at 98 MHz)
Capture Ratio:  1,8 dB (at 98 MHz)
Selectivity:  35 dB (at 98 MHz)
Image Rejection:  60 dB (at 98 MHz)
Signal-to-Noise Ratio:  better than 52 dB
Antenna Input:  300 Ω  Balanced
FM MPX Section
Circuitry:  Time-switching type demodulator FM mono-stereo automatic selection
Channel Separation:  42 dB (at 1,000 Hz)
AM Tuner Section
Circuitry:  Superheterodyne
Frequency Range:  525 to 1605 kha
IHF Sensitivity:  10 µV
Image Rejection 40 dB (at 1,000,000 Hz)
Antenna Input:  Built-in ferrite loopstick antenna
General
Power Supply:  110, 120, 130, 220 and 240 V (switchable) 50/60 Hz
Power Consumption:  11 V A
Dimensions (W x H x D):   370 x 118 x 337 mm (10-9/16" x 4-5/8" x 13-1/4")
Weight:  5,6 kg (12 lb 5 oz) net


Acoustic Energy AE2 loudspeakers


The Acoustic Energy, model AE2 is a high-power, compact, two-way loudspeaker, featuring the new patented "Metal Cone" bass/mid-range drive unit.
The "Metal-Cone" drive unit is a breakthrough in diaphragm technology and provides unequalled mid-band calrity, remarkable transparency and stero imaging due to the almost complete elimination of distortion
The use of two Bass/Mid range driver units in the AE2 gives further bass extension whilst retaining the speed and control of the unique "Metal-Cone".
The single most important element of a speaker is the diaphragm and the unique design of the Acoustic Energy "Metal-Cone" also provides exceptiona a power handling and durability.
"Metal-Cone" technology is protected by European Patent Application (no.87310904.5), United States pat. App. (no.133.020) World Patents Pending

Specifications
Frequency Response:  25 Hz - 30,000 Hz
On Axis at 1 m :  65 Hz - 18 kHz ±2,5 dB (50 Hz - 22 kHz ±4 dB)
Off Axis ±15° Horizontal at 1 m :  60 Hz - 18 kHz ±3 dB
Off Axis ±15° Vertical at 1 m :  60 Hz - 18 kHz ±3 dB
Sensitvity:  2,83 Volts RMS produces 91 dB SPL at 1 m
Impedance:  Minimum 5,5 Ω at 50 Hz  and 250 Hz. Max 16 Ω at 27 Hz
Harmonic Distortion:
At 90 dB / 1 Metre
2nd Harmonic :  less than 0,05%
3rd Harmonic :  less than 0,05%
At 100 dB / 1 Metre
2nd harmonic :  less than 0,1%
3rd Harmonic :  less than 0,1%
Power Compression Factor:  less than 1 dB at minimum Impedance (250 Hz) with an increase of 16 dB ( 1 watt, 40 watts ratio) Frequency Response within ±0,5 dB at 1 Volts RMS (ref. To 2,83 V RMS Input)
Power Handling:  for use with amplifier up to 250 watts RMS on program
Crossover:  2 way system
Crossover Frequency :  3,0 kHz 4th order 24 dB /octave 10 element all coils low DCR (LF Iron Dust Core, HF Air Core) all capacitors low Loss Polyester
Internal Wiring:  all connections via 24 strand 0,4 mm diameter Solid-Core Oxygen-Free-Copper (OFC). Silver plated individually Insulated conductors. All  connection Silver soldered.
LF Unit :  2 x 32 mm Edgewound ribbon copper voice coil, thermally coupled to tri-layer Ultra Hard Alloy 90 mm diaphragm max electrical peak to peak excursion - 8 mm max mechanical peak to  reak excursion 20 mm
HF Unit : 1 25 mm Edgewound ribbon copper plated aluminium voice coiil Thermally coupled to magnesium alloy 25 mm diaphragm ferrofluid damped and cooled Damped rear chamber loaded.
Connectors:  2 set 4 mm Binding posts for Bi-wiring
Cabinet:  precision engineered enclosure with bonded high density lining supplied with removable front grille
Finish:  Textured Black
Dimensions (W x D  x H):  235 x 330 x 385 mm
Weight:  17 kg (each)

Koss CM-1020 loudspeakers


Utilizing the Koss Theory of loudspeaker design and its computerized program, Koss engineers set out to design the optimum 3 bandpass loudspeaker. The result is a system that stands alone in delivering a high energy broadband response, a low distortion product, and a high efficiency level. The CM/1020 utilizes a dual port design to achieve proper cabinet tuning and greater structural stability. The specially-designed 10-inch woofer provides both a 3 dB gain in electrical efficiency as well as a flat response over the low bandpass. The 4½ inch midrange driver and 1-inch dome tweeter capture all the realism of your music without distortion. And to unite all these outstanding elements, Koss utilizes a unique, seamless crossover network. But no description can match the thrill of hearing the CM/1020 in a live demonstration.

Specifications
Bandpass Response (to typify the normal listening room situation):
Low Frequency ;  3 dB down point 31 Hz
High Frequency :  3 dB down point 18,5 kHz
Overall System Response :  6 dB down point 27,5 Hz to 19 kHz
Polar Response:  -3 dB (at 8 kHz);  -6 dB (at 10 kHz)
Intermodulation Distortion Products:  less than 1,5%
Reference Sensitivity:  93 dB SPL
Recommended Amplified Power Rating (8 ohm):  15 watts/channel (minimum); 150 watts/channel (maximum)
Impedance:  5 Ω (nominal), 4 Ω (minimum)
Input Power Overload Protection:  Fused 3 AG 2½ A
Dimensions (W x D x H):  15-1/2" x 13-3/4" x 33"
Weight:  60 lbs

Technics SU-7100 amplifier


Specifications:
Amplifier Section
Continuous Power (both Channels Driven)
At 1 kHz :  2 x 40 W (at 4 ); 2 x 37 W (at 8 )
From 40 Hz to 16 kHz :  2 x 38 W (at 4 ):  2 x 36 W (at 8 )
From 20 Hz to 20 kHz :  2 x 36 W (at 4 ):  2 x 35 W (at 8 )
Power Bandwidth (both Channel Driven at 4 ):  5 Hz - 30 kHz  -3 dB
Residual Hum and Noise:  0,6 mv
Total Harmonic Distortion:
Rated Power at 1 kHz :  0,1% (4 , 8 )
Rated Power at 20 Hz -20 kHz :  0,1% (4 , 8 )
Rated Power at 40 Hz - 16 kHz :  0,1% (4 , 8 )
Half Rated Power at 20 Hz - 20 kHz :  0,06% (4 , 8 )
Half Rated Power at 1 kHz :  0,03% (4 , 8 )
-26 dB Rated Power at 1 kHz :  0,1% (4 )
50 mW Power at 1 kHz :  0,2% (4 )
Intermodulation Distortion:
Rated Power (at 250 Hz : 8000 Hz =4:1) ; 0,16% (4 )
Rated Power (at 60 Hz : 7 kHz = 4:1) :  0,1% (8 )
Damping Factor:  20 at 4 ; 40 at 8
Input Sensitivity/Impedance
Phono :  2,5 mV/47 k
Tuner, Tape 2 Playback:  150 mV/33 k
Tape 1 Playback, Rec/Play Input :  180 mV/36 k
Phono Max. Input Voltage (1 kHz, RMS):  110 mV
Signal-to-Noise Ratio
Rated Power, (4 )
Phono :  83 dB (IHF, A ; 78 dB)
Tuner Tape :  83 dB (IHF, A;  97 dB)
-26 dB Rated Power (4 )
Phono :  55 dB
Tuner, Tape :  58 dB
50 mW Power Output (4 )
Phono :  53 dB
Tuner, Tape :  53 dB
Frequency Response:
Phono (30 Hz - 15 kHz) RIAA Standard Curve ±0,5 dB
Tuner, Tape
10 Hz - 80 kHz, -3 dB
15 Hz - 40 kHz, -1 dB
20 Hz - 20 kHz, ±0,5 dB
Tone Controls
Bass :  50 Hz ±12 dB
Treble :  20 kHz ±12 dB
Loudness Control (Vol. At -30 dB):  100 Hz =8 dB
High Filter :  8 kHz, -6 dB/oct
Output Voltage:
Tape 1, 2 Rec Out :  150 mV
Tape 1 rec/Play Output :  30 mV/82 k
Channel Balance (250 Hz - 6300 Hz):  ±1,5 dB
Channel Separation at 1 kHz :  60 dB
Headphones Level and Output Impedance:  400 mV/330
Load Impedance Main or Remote:  4 - 16  
Genaral:
Power Supply:  220 V/240 V 50/60 Hz
Power Consumption:  340 W
Dimensions (W x H x D):  410 x 139 x 329 mm
Weight:  6,6 kg

PSB Avante loudspeakers


The most popular model in the PSB line, the Avante is recommended for use in conjuction with home stereo systems. It is ideal for both recerational and professional listening where reliability, accuracy and compactness are required. Professional users include the CBC (cost to cost), the national ARTS Centre, The National Research Council, Tv and radio stations, recording studios.
" Transient response is excellent, with good attack and well damped suspension of ringing. A very realistic sttereo image is created, both in spread and depth, as a result of the good dispersion pattern and phase coherence of the Avanté"

Specifications
Frequency Response: 
Room :  38 Hz - 21,000 Hz
Anechoic :  70 Hz - 20,000 Hz ±2 dB
Dispersion 30° (Off Axis):  70 Hz -15,000 Hz ±2 dB
Sensitivity:  87,5 dB (1w/1m SPL ref.)
Dynamic Power Range Min. Recommended:  15 watts RMS
Dynamic Power Range Handling Capacity:  100 watts program. This speaker will handle the power of amplifiers rated from 15 - 150 watts RMS driven to clipping less than 10% of the time.
Nominal Impedanc:  8 Ω
Crossover:  1,500 Hz second order acoustic Butterworth, 12 dB/oct incorporating high powered air core inductors and high voltage bi-polar capacitors
Drivers:
Tweeter :  25 mm wide dispersion, high powered, treated textile dome
Woofer :  200 mm long throw plastic laminated compressed fibre cone with a focused magnetic gap and 1" aluminum voice coil for high power handling
Enclosure Type:  Tuned ducted port
Dimensions (W x H x D):  292 x 565 x 267 mm (11,5" x 22,25" x 10,5")
Weight:  12,75 kg (28 lbs)
Finish:  Walnut, Hicory vinyl veneer

PSB Targa loudspeakers

PSB Speakers
The latest group of PSB Speakers to enter the market is one impressive family: Targa, Avante, Passif I and Passif II adapt some of the most innovative design features in the industry. All four models of this matched family are two-way systems, reducing the problems associated with a second cross-over in the critical midrange, where the ear hears most accurately. PSB's  tweeters and long-throw woofers are matched in critically tuned and damped enclosures, keeping distortion to a minimum.
Targa
If your room and budget are relatively small, the Targa is the speaker for you. Engineered for modest systems, the Targa will deliver the PSB family sound in a smaller environment. Because of the smaller dome tweeter size, no phase plug is required in the Targa (but essential in the 1" dome). You will notice good bass response and smooth, natural highs, thanks to PSB's exclusive low diffraction baffle.
Even though the Targa's price is amall, it's sound and quality are not compromised.

Specifications
Frequency Response: 
Room :  45 Hz - 20,000 Hz
Anechoic :  80 Hz - 20,000 Hz ±2,5 dB
Dispersion 30° (Off Axis):  80 Hz -14,000 Hz ±2,5 dB
Sensitivity:  87,5 dB (1w/1m SPL ref.)
Dynamic Power Range Min. Recommended:  15 watts RMS
Dynamic Power Range Handling Capacity:  75 watts program. This speaker will handle the power of amplifiers rated from 15 - 120 watts RMS driven to clipping less than 10% of the time.
Nominal Impedanc:  8 Ω
Crossover:  2,100 Hz single order crossover
Drivers:
Tweeter :  19 mm wide dispersion, high powered, treated textile dome
Woofer :  200 mm long throw plastic laminated compressed fibre cone with a focused magnetic gap and 1" aluminum voice coil for high power handling
Enclosure Type:  Tuned ducted port
Dimensions (W x H x D):  260 x 527 x 254 mm (10,25" x 20,75" x 10")
Weight:  10,5 kg (23 lbs)
Finish:  Walnut, Hicory vinyl veneer