dbx Model 21

the model 21 Disc Decoder is an economical way for you to enjoy the new dbx Disc and Digital dbx Discs. It's even inexpensive enough to use  with a second stereo system in a family room or office.

Just connect the Model 21 to your system and you'll be able to play our complete library of dbx Encoded Discs.  The 21 can also be used to play back dbx encoded tapes which will be available soon.

 dbx Discs are produced using the finest conventional studio master tapes and deliver all their dynamic range. the Digital dbx Discs, encoded from digital master tapes, are the world's first records to reproduce - for a degree of excitement and impact that has to be heard to be believed.

In addition, dbx Discs virtually eliminate the pops, ticks and surface noise that the pops, ticks and surface noise that plague conventional records. For the first time, you can listen to the music, not the record.

dbx Discs and Digital dbx Discs are by far the most extraordinary reproduction of realistic music dynamics available today.

Specifications

Dynamic Range:  100 dB (peak signal to weighted background noise)

Input Impedance:  100 kΩ

Input Level: 

Nominal : 300 mV

Maximum : 6 VRMS

Output Impedance:  470 Ω (designed to drive 5 kΩ or greater)

Output level:  5,5 VRMS

Frequency response:  dbx Type II Decoding curve, ±0,5 dB , 30 - 15,000 Hz (Typical program material tracking)

Hum and Noise:  <-100 dBV (A weighted, 20 kHz bandwidth referenced to 1 V)

Total Harmonic Distortion:  <0 1="1" 4="4" at="at" decode="decode" encode="encode" khz="khz" output="output" p="p" to="to" up="up" vrms="vrms">

IM Distortion:  <0 p="p" smpte="smpte">

Power line Requirement:  117 V AC, 50 to 60 Hz

Power Line Consumption:  5 W

Dimensions (W x H x D):  8¾" x 2¾" x 6⅝" (222 x 70 x 165 mm)

Shipping Weight:  2,5 lbs (1,1 kg)

dbx Dynamic Range Expander

A dbx Dynamic Range Expander will significantly improve the sound quality of all your conventional records and tapes, and even FM broadcasts. First, it will increase the dynamic range of your music by as much as 50% to give you much of the excitement and impact of a live performance.

Second, a dbx Dynamic Range Expander can reduce annoying tape hiss and record surface noise by as much as 20 dB. Such a marked reduction in these distracting noises will dramatically increase your listening pleasure.

In short. you'll hear a sound quality you've never heard before from your entire music library. All because of the dramatic strides dbx has made with this remarkable technology.

A dbx Dynamic Range Expander is available for every system and every budget.

dbx 3BX Specifications

Expansion Ratio: Continuously adjustable from 1.0 to 1.5 (0 to 50% increase)linear in decibels

Dynamic Range: 100 dB (peak signal to weighted background noise)

Input Impedance: 50 kΩ

Input level: 300 mV nominal

Input level: 7 V RMS maximum

Output Impedance: 100 Ω (designed to drive 5 kΩ or greater)

Output Level: 7 V RMS (max. 20 Hz - 20 kHz)

Frequency Response: 20 Hz - 20 kHz ±0,5 dB at 1,0 expansion

Equivalent Input Noise: -85 dBV (unweighted, 20 kHz bandwidth, referenced to 1 V)

Total harmonic Distortion: 0,1%, typical at 1.0 expansion 20 Hz to 20 kHz

IM Distortion: 0,15% typical

Power Line Requirement: 117 V AC, 50 - 60 Hz

Power Line Consumption: 30 W

Dimensions (W x H x D): 17¾" x 3¾" x 10¼" (45,1 x 9,5 x 26,0 cm)

Weight (shipping): 12 lbs (5,45 kg)

dbx 3BX & 3BX-R

3BX

The 3BX is the most advanced dynamic range expander ever developed. It restores much of the drama, impact and excitement of a live performance by making loud passages louder and soft passages quieter.

Bass, midrange and treble frequencies are sensed in the music signal and expanded individually from extraordinary clarity of soud from even the most complex musical material. Three rows of LED's are used to monitor the degree of expansion in each of the three frequency ranges. An expansion level control lets you want, up to 50%. ANd, with the transition level control, you can adjust the threshold of expansion to vary the level above which the music signal is upward expanded. The 3BX is the most sophisticated and flexible dynamic range expander on the market. With, you can bring new life to your entire record and tape collection as well as dramatically increase your enjoyment of radio broadcasts. The 3BX is provided with a tape monitor loop to replace the one used on your receiver or preamp.

3BX-R remote Control

The 3BX-R not only allows you to operate your 3BX Dynamic Range Expander at a remote location, it also gives you more control capability. It includes a release time of the 3BX to the type of music you're playing - fast for high energy rock, slow for quiet symphonies. There's also a fade switch for automatically lowering the music level for fade down or raising the level for fade up - ideal for making professional fades during recording. Other features include a master volume control for your entire system, a 3BX bypass switch, and LED displays that indicate the operational mode of the 3BX. A 25-foot cable comes with the 3BX-R, and a 25-foot extension cable is available as an option.

3BX Specifications

Expansion Ratio: Continuously adjustable from 1.0 to 1.5 (0 to 50% increase)linear in decibels

Dynamic Range: 100 dB (peak signal to weighted background noise)

Input Impedance: 50 kΩ

Input level: 300 mV nominal

Input level: 7 V RMS maximum

Output Impedance: 100 Ω (designed to drive 5 kΩ or greater)

Output Level: 7 V RMS (max. 20 Hz - 20 kHz)

Frequency Response: 20 Hz - 20 kHz ±0,5 dB at 1,0 expansion

Equivalent Input Noise: -85 dBV (unweighted, 20 kHz bandwidth, referenced to 1 V)

Total harmonic Distortion: 0,1%, typical at 1.0 expansion 20 Hz to 20 kHz

IM Distortion: 0,15% typical

Power Line Requirement: 117 V AC, 50 - 60 Hz

Power Line Consumption: 30 W

Dimensions (W x H x D): 17¾" x 3¾" x 10¼" (45,1 x 9,5 x 26,0 cm)

Weight (shipping): 12 lbs (5,45 kg)

dbx 2BX

2BX

If you want dynamic range expansion technology at a lower cost than the 3BX, then the 2BX is the model for you. Its somewhat simpler circuitry divides the frequencies into two bands instead of three. Music integrity of the bass and treble is maintained so that dynamic range of highly percussive music, either rock or classical, without causing the high and middle frequencies to track the low frequency dynamics of the music. The 2BX has two rows of LED's for monitoring expansion in each of its bands.

As with the 3BX, you can select the expansion you want (up to 50%) and adjust the transition level using the two controls provided for these purposes. Except for the most critical applications, the 2BX offers an ideal choice for increasing the dynamic range of your stereo system and your enjoyment of recorded music. Like the more expensive 3BX, the 2BX features PRE/POST recorder selection to allow you to expand either before or after the tape recorder connected to the 2BX. This tape loop replaces the one used on your receiver or preamp.

Specifications

Expansion Ratio: Continuously adjustable from 1.0 to 1.5 (0 to 50% increase)linear in decibels

Dynamic Range: 100 dB (peak signal to weighted background noise)

Input Impedance: 50 kΩ

Input level: 300 mV nominal

Input level: 7 V RMS maximum

Output Impedance: 100 Ω (designed to drive 5 kΩ or greater)

Output Level: 6 V RMS (max. 20 Hz - 20 kHz)

Frequency Response: 20 Hz - 20 kHz ±0,5 dB at 1,0 expansion

Equivalent Input Noise: -85 dBV (unweighted, 20 kHz bandwidth, referenced to 1 V)

Total harmonic Distortion: 0,1%, typical at 1.0 expansion 20 Hz to 20 kHz

IM Distortion: 0,15% typical

Power Line Requirement: 117 V AC, 50 - 60 Hz

Power Line Consumption: 20 W

Dimensions (W x H x D): 17¾" x 3¾" x 10¼" (45,1 x 9,5 x 26,0 cm)

Weight (shipping): 8,3 lbs (3,8 kg)

dbx 1BX

1BX

Like its 3BX and 2BX counterparts, the 1BX can increaste the dynamic range of music from records, tapes and radio broadcasts by a factor of up to 50%. Its RMS level detector incorporates an infrasonic filter to prevent mistracking caused by turntable rumble or record warp. Ten LED's monitor upward and downward expansion and, as with the 3BX and 2BX, a transition level is provided to select the level above which the music signal is upward expanded and below which it is downward expanded. because of its less complex circuitry, the 1BX is priced so anyone can affard the benefits of increased dynamic range. The1BX provides a tape monitor loop to replace the one used on your receiver or preamp.

Specifications

Expansion Ratio: Continuously adjustable from 1.0 to 1.5 (0 to 50% increase)linear in decibels

Dynamic Range: 100 dB (peak signal to weighted background noise)

Input Impedance: 50 kohms

Input level: 300 mV nominal

Input level: 7 V RMS maximum

Output Impedance: 100 ohms (designed to drive 5 kohm or greater)

Output Level: 6 V RMS (max. 20 Hz - 20 kHz)

Frequency Response: 20 Hz - 20 kHz ±0,5 dB at 1,0 expansion

Equivalent Input Noise: -85 dBV (unweighted, 20 kHz bandwidth, referenced to 1 V)

Total harmonic Distortion: 0,1%, typical at 1.0 expansion 20 Hz to 20 kHz

IM Distortion: 0,15% typical

Power Line Requirement: 117 V AC, 50 - 60 Hz

Power Line Consumption: 10 W

Dimensions (W x H x D): 11" x 3¾" x 10¼" (27,8 x 9,5 x 26,0 cm)

Weight (shipping): 4,5 lbs (2 kg)

dbx Encoded Discs

Recordings of exceptional clarity and dynamic range

for your increased listening pleasure.

The technology behind dbx encoded discs.

DIAGRAM DEPICTING THE COMBINATION OF SIGNAL COMPRESSION

DURING ENCODING AND EXPANSION DURING DECODING THAT RESULTS

IN SURFACE NOISE REDUCTION AND DYNAMIC RANGE RETENTION

ON dbx ENCODED DISCS.

'' dbx '' is a trademark of dbx Inc.