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Yamaha YSP-1 Sound Projector Produces Virtual Surround Sound with One Speaker Enclosure

Part I

October, 2005

Sumit Chawla

 

Specifications:

Speaker Section

● Drivers: Forty 1.5 Tweeters, Two 4.5" Woofers;
    Magnetically Shielded; Sealed Enclosure

Amplifier Section

● 2 Watts to Each Tweeter; 20 Watts to Each Woofer


SSP Section

● Inputs: Two Optical, One Digital Coaxial, Two Pairs
    Analog
● Outputs: Subwoofer Pre-Out, One Composite Video
    for OSD
● Codecs: DD, Pro Logic, DPL-II, DTS, DTS Neo: 6

General

● Dimensions: 7.8" H x 40.7" W x 4.6" D
● Weight: 28.7 Pounds
● MSRP: $1,499 USA

 

Yamaha

www.yamaha.com

Introduction

Flat panel displays have been in vogue for some time now. Their popularity has been accompanied by the introduction of in-wall and on-wall speakers from most of the speaker manufactures. The goal of all such designs has been to make the speaker less obtrusive. Although many consumers would like to have surround sound to go with the flat panel TVs, for one reason or another, they can't install a speaker array in the same room.

For such individuals, there is now an option from Yamaha, called the Digital Sound Projector, or YSP-1. It provides surround sound through an aesthetically pleasing single unit that goes underneath the flat panel TV. Included in the body is a surround sound processor and 42 individual amplifiers for each of the 42 speakers. Aside from a DVD player, it really has all that you need to get a surround sound system started, without having to mount speakers all the way around your room.

The Design

The YSP-1 is a powered speaker. The amplifier section is rated at 2 W x 40 (1 kHz, 10% THD, 10 ohms) for the tweeters and 20 W x 2 (100 Hz, 10% THD, 4 ohms) for the woofers. There is no capability to bypass the internal amplifiers. The photo below shows the 40 tweeters flanked by two woofers on the ends.

The SSP section provides some basic inputs/outputs. On the input side, two pairs of analog inputs, two optical digital inputs, and one coaxial digital input are provided. There is no video switching capability. On the output side, a composite video output designated for OSD is provided. For audio, there is a subwoofer pre-output jack. Three selectable crossover settings are provided: 80 Hz, 100 Hz, and 120 Hz. The low-frequencies can be routed to either the subwoofer only, the YSP-1 only, or both. The YSP-1 definitely needs to be augmented with a subwoofer, and I recommend using the option where the low-frequencies are only routed to the subwoofer. That way, for example, the YSP-1 is only required to handle frequencies down to 120 Hz.

Dolby Digital and DTS sources are decoded by the SSP. In addition, DPL, DPL-II, and DTS Neo:6 can be used with two-channel sources. When using Dolby Pro Logic II, Panorama, Dimension, and Center Width parameters can be adjusted. In DTS Neo:6 Music mode, the Image parameter can be adjusted. Even though the YSP-1 is not THX-certified, it does adhere to the THX requirement of attenuating DTS soundtracks by 4 dB. Internal test tones are provided for level calibration, but I found the internal test tone to set the subwoofer level too high compared to what I got from Avia. For this reason, I recommend using an external calibration disc, such as Avia or DVE, to calibrate the levels.

There are three dynamic range modes: Min, Std, and Max, with Max being the default. These modes are only effective when decoding Dolby Digital and DTS signals. The LFE channel can be attenuated by as much as 20 dB. Again, this applies only to Dolby Digital and DTS signals. The mute level can be set to either shut off the volume completely or reduce the current volume by 20 dB. The display on the front can be dimmed or turned off.

The Remote Control

The supplied remote is of the universal variety, and it can be used to control four additional devices. The small database with codes to control various devices is provided in the user manual. There is no learning capability unfortunately, so you would probably want to have your learning remote learn the commands from this remote.

The buttons on the remote are well laid out, and there is good spacing between the buttons. Unlike with most remotes, channel levels are adjustable through a single button press on this one. At the bottom of the remote are buttons to select the different beam modes (changes how the sound is dispersed from the speaker drivers). Below each button is an icon showing the dispersion pattern used for that mode, which is very useful.

In general, I liked this remote, but I would like to see it develop into a fully functional remote. It should be backlit, and learning capability should get added along with a more extensive device database. In the market that the YSP-1 is being targeted at, I think that such a remote would be a welcomed upgrade.

How It Works

The YSP-1 works by projecting directional sound beams for the front left/right and surround left/right speakers onto the side walls. As the sound bounces off the wall and reaches the listener, the sound will appear to originate from the point of the last reflection. The diagram below illustrates the dispersion/reflection pattern and where the ear would place the virtual speakers in the room. As can be seen, the YSP-1 can create (simulate) a five-speaker array in the room. Clever! For this to work, however, the surface that the beam projects onto must be reflective. Acoustically absorbent surfaces, furniture obstruction, or a wall opening will have an effect on the surround sound.

The YSP-1 provides four beam modes to choose from. The first mode is the conventional stereo mode which does not rely on sound reflecting off of any wall. The three other modes, referred to as 3 Beam Mode, 5 Beam Mode and Stereo+3 Beam Mode, rely on sound reflecting from the side and/or rear walls (see figures below). When a corner installation is used, the 3 and 5 beam modes are automatically disabled.

Click Here to Go to Part II.

Copyright 2005 Secrets of Home Theater & High Fidelity

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