Sunday, August 12, 2012

Surround Sound: 5.1 vs 7.1 vs Virtual Surround

Which surround sound setup most accurately emulates the rumbling bellow of that Star Destroyer Sound Wrapping over our heads at the beginning of Star Wars: A New Hope? If money’s no object, shooting for any high-end 7.1 surround sound setup will likely net you some mindblowing audio. In the real world, though, where we have to contend with budgets and financial responsibility, it helps to know what we’re paying for.



Sound Bars and 2.1 Stereo: Can Virtual Surround Sound Cut It?


virtual surround sound, or VSS. By delaying certain sound signals or bouncing sound waves off walls, virtual surround sound can do a pretty good job of fooling our ears and making us think sound is actually coming from behind us.

Does it actually measure up to a true multi-speaker surround setup? Well, no. That’s the bitter truth: you’re not going to get the absolutely convincing, clear sound of a multi-speaker system with virtual surround sound. But they’re coming closer, and there are still reasons to look at them. In a small room, where it may be difficult to fit a 5 speaker arrangement, virtual surround can use the walls to its advantage, bounce sound to the back of the room, and fill the space. Virtual surround typically comes in two forms: one piece sound bars (sometimes accompanied with a subwoofer), and more traditional 2.1 (two speakers and a subwoofer) configurations.

sound bar reviews demonstrates the range between these two purchasing philosophies. Just about any sound bar’s going to cut out the clutter and mess of wires of a larger 5 speaker arrangement, but some of them are far from budget priced. 2.1 VSS kits like the Sony DAV-X1 hit near the mid-high end of the sound bar price spread, but are still best for a fairly small listening space.

Bottom line: Quality virtual surround sound system can cost less than some high-end 5.1 or 7.1 arrangements, but ultimately they’re more about saving space than saving money.

5.1 vs 7.1 Surround Sound: More Speakers Equals Better Sound?  , a home theater room to fill with waves of sound or a true ear for audiophile-calibur quality, it’s time to start hunting for a multi-speaker system. But how many speakers is enough? Typical surround systems are either 6 channel (5.1) or 8 channel (7.1). 5.1 configurations include a center speaker, subwoofer, left and right front speakers and left and right rear speakers. 7.1 adds a pair of side speakers into the mix.

7.1 support in the theater. In that regard, home theater is actually a bit ahead of the game--over 150 movies have been remixed with 7.1 sound for the Blu-Ray release.

To future-proof your setup without immediately investing in a more expensive 7.1 system, take the easy way out: go for a 5.1 surround that can support additional speakers. Later, when the time’s right for some side-speaker action, grab up some matching speakers and upgrade to 7.1.

Of course, this leads to another question: is it better to go with an all-inclusive home theater in a box or a custom-built setup with independently purchased speakers and a receiver? This one comes down almost entirely to money and your setup proficiency. Building your own home theater with a totally kickin’ receiver and high quality speakers will always net you better sound--but when the best AV receivers cost more than entire box systems all by themselves, it’s time to sit back and seriously consider how much money you’re willing to spend.

Monday, August 6, 2012

SNELL IC-C7S

For built-in cabinets, a utility version of the award winning C7 TowerThe IC C7HCC THX is based on the world’s first THX Ultra2 certified speaker. THX’s Ultra2 sets a benchmark for surround sound playback of...Music and Movies...Digital and ProLogic...DVD and CD. The result is a system uncompromised by program content or format! The IC C7HCC THX deploys the components of the award winning Snell XA 90ps in a space efficient enclosure designed to fit into most furniture and built-in cabinets or behind acoustically transparent screens. Intended for home theater and music system’s L/C/R channels, the IC C7HCC THX features a three-driver eXpanding Array (XA) of dual 2 ½-inch midranges and 1-inch aluminum dome tweeter. This unique driver/crossover innovation manages vertical directivity without lobing, for a natural and “airy” soundstage. Furthermore, its controlled dispersion pattern and special tuning compensate for unpredictable room acoustics and boundary interactions. Coupled with two 8-inch high output woofers, the IC C7HCC THX is capable of tremendous output, providing effortless, powerful sound to below 50 Hz. Every IC C7HCC THX is assembled by hand and individually calibrated, assuring performance to within 0.5dB of its reference standard.               

Thursday, August 2, 2012

What You Need To Know About Amplifiers and Amplification

One receiver has 50 Watts-Per-Channel another one has 100, and still another has 200. The more watts the better right? Not Necessarily.
Most people think that more watts means more volume. An amplifier with 100 WPC is twice as loud as 50 WPC right?  DecibelsSound levels are measured in Decibels (db) In essence, our ears detect differences in volume level in a non-linear fashion. Our ears become less sensitive to sound as it increases. Decibels are a logarithmic scale of relative loudness. A difference of approximately 1 db a minimum perceptible change in volume, 3 db is a moderate change in volume, and about 10 db is an approximate perceived doubling of volume. To give you an idea of how this relates to real-world situations the following examples are listed:0 db is the threshold of hearing
Whisper: 15-25 dB
Background noise: about 35 dB
Normal home or office background: 40-60 dB
Normal speaking voice: 65-70 dB
Orchestral climax: 105 dB
Live Rock music: 120 dB+
Pain Threshold: 130 dB
Jet aircraft: 140-180 dB
In order for one amplifier to reproduce sound twice as loud as another in Decibels you need 10 times more wattage output. An amplifier rated at 100 WPC is capable of twice the volume level of a 10 WPC amp, an amplifier rated at 100 watts per channel needs to be 1,000 watts per channel to be twice as loud. In other words, the relationship between volume and wattage output is logarithmic rather than linear.  DistortionIn addition, the quality of the amplifier is as (or more) important than just the wattage output. An amplifier that exhibits excessive noise or distortion at loud volume levels can be unlistenable. You are better off with an amplifier of about 50 WPC with a low distortion level that a much more powerful amplifier with high distortion levels. For example, an amplifier that has a distortion rating of 10% at full power output is unlistenable (perhaps even at lower output levels as well), however, an amplifier that outputs a .01% distortion level at full power output level would be imperceptible at all listening levels. Distortion specifications are expressed by the term THD (Total Harmonic Distortion). Signal-To-Noise Ratio (S/N)Also, another factor in deciding amplifier quality is Signal-To-Noise Ratio (S/N), which is ratio of sound to background noise. The larger the ratio, the more the desirable sounds (music, voice, effects) are separated from acoustical effects and background noise. In amplifier specifications S/N ratios are expressed in decibels. A S/N ratio of 70db is much more desirable that a S/N ratio of 50db.  Continuous PowerAn additional factor is this equation is the ability of a receiver or amplifier to output its full power continuously. In other words, just because your receiver/amplifier may be listed as being able to output 100WPC, doesn't mean it can do so for any significant length of time. Always make sure that, when you check for Specifications, that the WPC output is measured in RMS terms. This means that the listed power output is sustained output at a specific volume level. How Stated Power Ratings Can Be Deceivingalso to the continuous power rating, another factor affecting real amplifier power output, especially with surround sound receivers, is whether the manufacturer is basing their wattage output specification on one or two channels driven or with all channels driven. In addition, was the measurement made using a 1KHz test tone, or with 20Hz to 20KHz test tones?In other words, when you see an amplifier wattage rating of 100 watts-per-channel at 1 KHz with one or two channels driven, the real-world wattage output when all 5 or 7 channels are operating across all frequencies will be lower, possibly as much as 30 or 40% lower. Of course, not all channels actually require the same power at the same time as variations in audio content affect the requirements for each channel at any given time. However, it is important to note that the wattage output, as stated in the manufacturer's specifications, may not be available across all channels at the same time.  Dynamic Headroom is the ability of your receiver/amplifier to output power at a significantly higher level for short periods to accommodate musical peaks or extreme sound effects in films. This specification is very important in home theater applications, where extreme changes in volume and loudness occur during the course of a film. This specification is expressed as Dynamic Headroom. Once again, Dynamic Headroom is measured in Decibels. If a receiver/amplifier has the ability to double is power output for a brief period to accommodate the conditions described above, it would have a Dynamic Headroom of 3db.  ConclusionSo, when shopping for an receiver/amplifier, be wary of wattage output specifications and also take stock of other factors such as Total Harmonic Distortion (THD), Signal-To-Noise Ratio (S/N), and Dynamic Headroom. In conclusion, your amplifier or receiver, although the centerpiece your audio or home theater system, other components such as Loudspeakers, Input devices (CD, Turntable, Cassette, DVD, etc...) are also links in the chain. However, you can have the best components available, but if your receiver or amplifier isn't up to the task, your listening experience will definitely suffer. This has been a very brief overview of some of the factors to take into consideration when buying a Receiver/Amplifier.by robert silva 

Dolby Surround Sound Atmos 62.2 Channels Coming to Home Theater?

The system, which has debut with the  Pixar flick "Brave," offers a 62.2 surround sound format that includes developments such as pan-through array and overhead speakers.

While the 62.2 format will likely never make it into home theaters, it's something that integrators should be aware of.

This video from Dolby not only runs through the historical development of audio, from mono to stereo to 5.1 and 7.1 surround sound, but it explains in detail how the new Atmos system works. It is a great video to show your customers about the importance of sound immersion.

To date, 14 theaters are equipped with the system. by jason knott



  list of theaters currently equipped with Dolby Atmos 62.2 Surround Sound

AMC BarryWoods 24 (Kansas City, MO)
AMC Burbank 16 (Burbank, CA)
AMC Century City 15 (Century City, CA)
AMC Downtown Disney 24 (Lake Buena Vista, FL)
AMC Garden State 16 (Paramus, NJ)
AMC Van Ness 14 (San Francisco, CA)
ArcLight Sherman Oaks (Sherman Oaks, CA)
Brenden Theatres at the Palms (Las Vegas, NV)
Century at Pacific Commons and XD (Fremont, CA)
Cinemark West Plano and XD (West Plano, TX)
SilverCity-Yonge Eglington Cinemas (Cineplex) (Toronto, ON)
Cinetopia Vancouver Mall 23 (Vancouver, WA)
El Capitan Theatre (Hollywood, CA)
Kerasotes ShowPlace ICON at Roosevelt Collection (Chicago, IL)