SONY TA-V909
¥ 99,800 (released in 1997)
Commentary
An AV amplifier with a built-in Dolby digital processor equipped with digital cinema sound technology.
A 24-bit DSP is used for decoding the Dolby Digital.
It can be connected to the digital output of the DVD player to decode and amplify Dolby Digital.
It supports the bus redirection function of Dolby Digital and allows you to divide the low-frequency range to other speakers. This allows you to enjoy dramatic surround sound playback even when you use a small speaker that tends to lack the low-frequency range, by letting the subwoofer handle only the low-frequency range.
The crossover network processing for low-pass extraction is done in the DSP with 24-bit processing at the digital stage.
It is equipped with Cinema Studio mode and Virtual 3D mode by digital cinema surround, which is Sony's original surround technology.
Cinema Studio Mode allows you to enjoy the sound effects of three different types of Sony Pictures Entertainment studios.
In the Virtual 3D mode, you can create a sound field unique to a movie theater more actively by making full use of 3D acoustic technology. It is equipped with various modes : Virtual Multiria, which allows you to enjoy the feeling of being surrounded by many rear speakers, Virtual Rear Shift, which allows you to get a sense of a wide sound field like a movie theater, and Virtual Enhanced Surround A/B, which allows you to play back the sound of the rear with only the front speakers.
In addition to the surround mode of digital cinema sound, it is equipped with a total of 29 programs and 56 surround modes, including modes for reproducing sound fields of concert halls and live houses.
You can also tune up to your preference by adjusting various parameters based on preset modes.
The D/A converter is equipped with a full-feed-forward digital filter and an advanced pulse D/A converter.
In the full-feed-forward digital filter, low-order bits, which were previously rounded off, are transmitted through a separate route, stored in memory, and combined with the result of the next stage operation. This enables oversampling operations that also reflect low-order bit data, thereby almost completely eliminating requantization noise within the audible band.
In the TA-V88ES, the advanced pulse D/A converter is integrated into a single LSI together with a full feed-forward digital filter to achieve more stable operation.
Each of the front, center, and rear channels has its own digital equalizer that can adjust high and low tone in the digital domain.
A dynamic 5-amp system with front L/R, center and rear L/R amplifiers is adopted, enabling more powerful surround playback.
The power stage uses a parallel transistor with two NPN-type and two PNP-type elements arranged on the same plate. This allows the temperature environment to be matched and the amplification characteristics to be matched. In addition, the plate on which the elements are mounted is of a large size. It functions as a stabilizer to prevent sudden changes in temperature to improve stability.
A large transformer with a wrapped core is used for the power supply.
In conventional EI core transformers, E-type and I-type magnetic steel sheets are individually laminated and then combined (welded or bonded) to form the core. However, by adopting a wrap-packed structure in which E-type and I-type magnetic steel sheets are stacked alternately, there is no part that is cut in a fault in the magnetic path, reducing leakage of magnetic flux.
The electrolytic capacitor is also equipped with a large-capacity and large-size type for pure audio that is carefully selected through repeated trial listening not only in electrical characteristics but also in acoustic characteristics.
The heat sink uses a high-rigidity large heat sink made of extruded aluminum that is tuned to suppress harmful fin squeal. The heat sink itself is also firmly fixed to the chassis body to reduce vibration structurally.
The legs are equipped with an eccentric insulator.
The eccentric insulator has a structure with a screw hole to avoid the center position, and by changing the phase of vibration, it is canceled and transmission to the chassis is reduced.
Equipped with an AC-3 RF input, it supports Dolby Digital Audio, which is converted to RF signals and recorded on a Dolby Digital Laser Disk.
Equipped with base boost function, you can increase the impact of low sound with one touch.
It has a direct pass switch that allows you to bypass surround, tone control and base boost circuits as needed.
A simple menu operation using cursor keys is adopted to improve operability.
The SA-IF70 can be used as a rear speaker with a dedicated terminal that can be combined with the optional wireless speaker SA-IF70.
Wireless remote control with learning function is included.
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Model Rating
| Type | AV amplifier | ||
| Maximum Practical Output (EIAJ, 6 Ω) | Front : 150W + 150W Center : 150W Rear : 150W + 150W |
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| Total harmonic distortion rate (20 Hz to 20 kHz) | Front : 0.09% or Less (at 6 Ω load, 90W + 90W output) | ||
| Frequency characteristic | Line : 10 Hz to 50 kHz + 1-3 dB (when direct path is ON, analog system) | ||
| Signal-to-noise ratio (A network) | Line : 82 dB (when direct path is ON) | ||
| Surround Mode | 29 Program 56 mode (refer to the surround mode list below) | ||
| Dolby Pro Logic Input Balance | Auto | ||
| Tone control | Front, center and rear independent Bass : ± 10 dB (center frequency 90 to 992 Hz) Treble : ± 10 dB (center frequency 1.0k to 8.6 kHz) Increment / decrement step : 0.5 dB |
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| Input of video equipment (audio & video) | Line 5 | ||
| Video equipment (audio & video) output | Route 2 | ||
| Video monitor output | Route 1 | ||
| S-image input | Route 3 | ||
| S Video Output | Route 1 | ||
| S video monitor output | Route 1 | ||
| Digital input | Light : 4 systems Coaxial : 1 system AC-3RF : 1 System |
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| Digital output | Light : 1 system | ||
| Audio input | Phono MM : 1 system Line : 4 routes |
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| Audio Out | Rec out : 2 lines Two sub-woofers Headphone : 1 system |
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| AC outlet | Power switch interlock : 2 systems | ||
| Pwer | 100 VAC, 50Hz/60Hz | ||
| Power consumption | 217W | ||
| External dimensions | Width 430x Height 155x Depth 360 mm | ||
| Weight | Approx. 12.7 kg | ||
| Attachment | Remote Controller with Learning Function RM-P501 | ||
Surround mode on the TA-V909
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