The Details

Designed by renowned audio tech engineer Andrew Jones, the Pioneer SP-EBS73-LR “bookshelf” speakers can be used as stereo front-liners or as surround sound generators. Two concentric, 1″ mid-tweeter arrays provide clarity beyond the peers of these speakers, but the 5.25″ woofers also give you expressive, richly detailed bass, which is not always the case when you’ve got a lot of power in the treble.

Placed strategically, the SP-EBS73-LR speakers provide an outstanding surround sound experience because of their three-way design. The tweeters and woofers are paired up with 4″ midrange drivers. This unique driver configuration comprises Pioneer’s CST (Coherent Source Transducer) Concentric Driver. The build quality is regarded as superb, enhancing the resonance of the speakers. (They are 7.4″ wide by 15.7″ tall by 9.7″ deep, with gracefully curved sides.) To have surround sound, it’s recommended that the speakers be placed on stands about a foot out from the wall to allow their rear bass port, which gets down to 50Hz, to breathe and to allow the sounds to have more reflective space.

If you like music that’s heavier than classical/orchestral, jazz trio, New Age, etc., then you’ll want to invest in HD Tracks to listen to pop, heavy metal, blues, etc. These speakers are so high fidelity that they have a slight “treble forwardness” quality that reveals the tiniest flaw of lower quality tracks, especially with rock music and it sub-genres because there’s so much loudness.

The SP-EBS73-LR speakers can be used alone as your stereo output, or they can be part of a multichannel system as flankers for Pioneer’s Elite SP-EC73 center-channel speaker.

The SP-EBS73-LR speakers also come equipped with Dolby Atmos technology, which has been designed to accurately pinpoint the precise location of an audio object within a 3-D audio space and thus give you a far more realistic audio experience while you’re watching Atmos-coded Blu-ray movie or concert discs. The Atmos driver in these Pioneers is in the top and flush-mounted in a 20 degree, angled baffle. But, for now, Atmos coded movie discs are limited.

The best feature of the Pioneer SP-EBS73-LR speakers is simply the surround sound that you can buy without having to empty your bank account or go into debt. Retailing at US $700 to $750, it seems well nigh impossible to find a better surround sound system in this price range according to all available reviews.

Another Option

Another surround sound option, which costs several hundred dollars more than the SP-EBS73-LR speakers, is the Audio MASS System (5.1). Made up of a horizontally-aligned MASS Centre speaker, four MASS 10 satellites, and the MASS W200 active subwoofer, this system is praised by listeners for delivering power and sonic detail that’s exceedingly hard to match. The satellite speakers are so compact, standing on slender posts, that they can easily be placed so as to be nearly invisible, but they’re also designed with a futuristic or otherworldly beauty. The other two, larger components have the same eye-appealing quality. I should point out that you can find the 5.0 system for about the same price as the Pioneer speakers.

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The Details

Computer speakers get a bad rap and, for the most part, the poor reputation is well deserved. The A2+ defy this stereotype with their rich timbre and hifi support. This is a cost-effective, compact option that sounds as good as many bookcase speakers.

The A2+ has a built-in  44/16 DAC, or digital analog converter. A DAC converts digital data into analog signal. Most computer speakers need a standalone DAC to play hi-fi files. The A2+ does need a standalone to play 24-bit tracks, but runs most other HDtracks without any issues.

I’ve read mixed reports on the bass. Some say they were a little let down by the lows on the speaker and needed a subwoofer. Others reported that the A2+ has a significant output below 50hz and did not require a subwoofer. Either way, the A2+’s bass is in the highest echelon of computer speakers.

In addition to the USB and RCA outputs, the A2+ has a 3.5mm mini-jack for connecting phones and mp3 players.

Currently, the A2+ is available in red, white, and black. All three options are in a beautifully finished wood and look great on a desk. They speakers weigh about 5lbs each and their dimensions are 4″ x 6″ x 5.75.”

The Audioengine A2+ Desktop Speakers are available on Amazon for about $250.

Another Option: M-Audio Studiophile Speakers

Another option is the M-Audio Studiophile AV 40 Active Studio Monitor Speakers. The speakers sound almost as good as the Audioengine’s A2+. They are bulkier speakers however — at 8.75 x 6 x 7.25 inches, they area almost too large for a desktop.

The M-Audio Studiophile AV 40 are available for about $160 on Amazon.

The Best Computer Speakers For Bass

For those interested in the computer speaker with the best bass, see Harman Kardon’s Soundsticks III. These speakers come equipped with a 6″ 20-watt downward-firing subwoofer with eight full-range transducers.

My old roommate had the the Soundsticks for over a year, and they fill the entire living room with a deep and pure sound that rivals larger, more expensive setups. They do suffer from some design flaws. They don’t have a headphone jack and there is no way to control the bass through the speakers. They cost $170.

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The speakers that produce the lowest bass are tactile transducers — they typically produce frequencies in the 0.5 – 20 Hz range. Tactile sound is not perceived through the ears — it perceived through the body. Most subwoofers are incapable of producing audio in this range.

A good tactile transducer to start with is $150, entry-level Clark Synthesis Silver Edition (TST239) — it provides ample sub-frequency bass for the home user.

The Details

Tactile sound is the sensation of sound transmitted directly to the human body by contact, rather than by sound waves through the ears (tympanic sensation).

More specifically, it is sound perceived through bone conduction, through muscles and deep tissue, and via skin sensation. We perceive the vibrations through our haptic senses which include both kinesthetic (muscle) and touch (cutaneous) senses. We feel both inaudible (infrasonic frequencies) and audible frequencies. Thus, tactile sound is not just brute rumbles and shock waves.

Tactile sound can be perceived in high fidelity up to the mid-range frequencies. According to NASA research we perceive 0 to 1 kHz through the sense of touch, 0 to 3 kHz through kinesthesia (the sense of the relative position of neighboring parts of the body), and 0.20 kHz to 20 kHz through our ears. Note there’s an overlap — we can hear the range of 0.20 kHz to 3 kHz both with our ears and through other parts of our body. Also, some hearing-impaired individual can hear sounds up to 5 kHz through their skin.

Tactile sound is a sensation that many seek out. People often buy expensive subwoofers to achieve deep bass effects. In this pursuit, subwoofers are often pushed past recommend levels, resulting in damaged equipment, muddied sound fields, and disturbed neighbors. Typically, subwoofers not produce tactile sound very well. They are designed to transmit low frequency sound through the air, and they don’t usually produce bass below 25 – 30Hz. Correctly installed and enclosed subwoofers can producer lower and louder deep bass, but they will not produce the same level of tactile vibrations.

So what kind of device produces tactile sound? Tactile transducers, or electro-mechanical devices that are built specifically to vibrate objects. They are very similar to a loudspeaker woofer driver minus the cone.

There are two basic flavors of transducer: inertial shakers and linear actuators. Let’s take a look at the differences between the two:

Inertial Shakers

Inertial Shakers operate by shaking a mass in an enclosed housing. The resulting vibrations are transferred to an attached object, like the wooden crossbeam of a couch, for example. Usually, shakers are bolted directed to an object.

Companies that make Inertial Shakers include: Clark Synthesis, Aura Sound, Earthquake Audio, Buttkicker and Sonic Immersion Technologies. These devices vary widely in price — some produce a simple shaking effect, some produce high-fidelity sounds that compliment to a stereo system or home theater (such as those offered by Clark Synthesis, my personal favorites).

A good tactile transducer to start with is $150, entry-level Clark Synthesis Silver Edition (TST239). It will produce solid definition to drum hits, or shake your fillings loose if you so desire. The transducer can be installed in less than an hour. It took me about 45 minutes to bolt it to the bottom of my couch, using the parts provided with the transducer. In my test installation, I removed the fabric from the button of a couch, and bolted the transducer to a crossbeam underneath. Once installed, the entire couch functions as a bass speaker.

But wait, we need to power the tactile transducer! Clark Synthesis sells a $350 customized tactile amplifier to do this, but you can actually use any amplifier that outputs at least 100 watts (check the Clark Synthesis documentation for more info). Well, Cambridge Audio makes good amplifiers, but their entry-level models start at $330. We can instead use an AudioSource amplifier. This is a 2-channel 100-watt (50 watts x 2) power amplifier, which can be purchased for under $100. This amplifier is well-reviewed —  111 reviewers on Amazon gave it an average of 4 out of 5 stars. You attach your amplifier to the tactile transducer using standard speaker cables. You then connect the amplifier to the Sub Out connector on your receiver.

Linear Actuators

Linear Actuators are transducers that push against a hard surface. They apply a force directly to an object, in contrast to Inertial Shakers which vibrate themselves, and then transmit that vibration into another object. Commercially available Linear Actuators usually replace the feet of a chair. They operate by pushing against the floor, and directly lifting and dropping a chair. They tend to be more expensive that Inertial Shakers, and they can be only installed under chairs — they can’t be installed under a floor or in a swimming pool like the shakers above.

Companies that offer Linear Actuator include: Crowson Technology and d-Box Technologies.

See also: The Tactile Transducer FAQ

The post The Speakers With The Deepest Bass: Tactile Transducers appeared first on Reactual.

Pros:

• Great display and user interface
• Floats on water
• Portable

Cons:

• Small screen not the best for permanent installations

Top Review Sources:

• GPS Tracklog: “Highly recommended; probably the best marine handheld series currently made by Garmin”
• Marine Electronics Reviews: “One of the most sophisticated marine handheld GPS units on the market today”
• Amazon: 4.5/5.0 (5+ reviews)

The Garmin GPSMAP 78sc is a handheld GPS built for use in boating and watersports. The 78sc measures 6.0” H x 2.6” W x 1.2” D and weighs less than eight ounces with two AA batteries installed. The display itself measures 2.6” diagonally and has a resolution of 160 x 240. It is possible to hold and operate this unit with one hand—rubber sides enhance grip security. Above the screen, you’ll find eight buttons plus a directional pad, all of which control functions via a responsive and well-organized on-screen menu system. The 65K color TFT display is sharp and detailed, exhibiting no problems with washout in the sunlight. The 1.7 GB internal memory of the 78sc is preloaded with coastal charts, and the microSD slot enables you to add more maps or custom data via an external card. The microSD slot, mini USB port, serial port, and external antenna jack are all protected by a rubber cover on the back of the device. When the cover is in place, the 78sc is waterproof (and floats). If you’d like to permanently mount your 78sc, there is an optional mount and power cord available. Running on batteries, the 78sc will operate for approximately 20 hours. The 78sc is also equipped with an electronic compass and barometric altimeter. This unit comes with a one-year warranty.

The Garmin GPSMAP 78sc ($487) is for sale on Amazon. Also available is the GPSMAP 78 ($297), which is not preloaded with maps and does not have an electronic compass and barometric altimeter, and the GPSMAP 78s ($386), which also lacks the maps but has an electronic compass and barometric altimeter.

Humminbird 788ci HD Combo ($606)

Pros:

• High-resolution screen
• Very accurate GPS
• Excellent sonar

Cons:

• Some image details are very small

Top Review Sources:

• Cabela’s: 4.5/5.0 (10+ reviews)
• Bass Pro Shops: 4.4/5.0 (10+ reviews)
• Marine Electronics Reviews: “A desirable chartplotter fishfinder combo for any boater looking to upgrade their marine electronics gear”

The Humminbird 788ci HD Combo unites GPS capability with state-of-the-art sonar in a highly-regarded navigation/fishfinding device. The 788ci HD Combo has a 640 x 640, 256-color TFT screen that measures five inches diagonally. Its high resolution permits a high level of detail, though very small details can be hard to read. Viewing angles are wide, reflectivity and glare are low, and the display remains legible in direct sunlight. The unit itself has dimensions of 6.9” W x 7.5” H x 4.5” D and can be mounted either in-dash or on its included quick-disconnect stand. Its internal GPS receives praise for its impressive accuracy and tight integration with its sonar functions. Its sounding capability is similarly impressive, with 500 watts of power, multimode results display, and dual beams. The supplied transducer can be transom-mounted or mounted inside the hull. You can supplement the 788ci HD Combo’s internal memory via its two external memory card slots. This unit carries a one-year warranty.

Purchase the Humminbird 788ci HD Combo ($606) on Amazon. You’ll also find the 788ci HD DI Combo ($740), which has down imaging capability.

Lowrance HDS-7 ($999)

Pros:

• Large, sharp screen
• Very precise GPS
• Easy-to-navigate interface

Cons:

• Included maps may not meet all needs

Top Review Sources:

• Marine Electronics Reviews: “Excellent for daylight viewability”
• Bass Pro Shops: 3.8/5.0 (15+ reviews)
• Cabela’s: 4.0/5.0 (2 reviews)

The Lowrance HDS-7 is a chartplotter/fishfinder combo unit with a 6.4-inch, 480 x 640 display. Images are sharp and bright even in sunny conditions, and viewing angles are excellent. On-screen functions are controlled by means of the HDS-7’s eight pushbuttons and arrow pad. Processing is speedy and the response time of menus is above average. As with the other nautical GPS units reviewed here, the HDS-7 can save thousands of waypoints and hundreds of routes. Memory capacity is expandable via the external SD card slot. The HDS-7’s 16-channel internal GPS antenna is a strong performer, locking on to signals quickly and exhibiting outstanding accuracy. The HDS-7 will also accept an external GPS antenna if you have a closed cabin. There are a variety of mapping cards available to supplement the included Expanded U.S. or Insight USA internal maps. The fishfinder works well with the included transom-mount, skimmer transducer and is able to sound 5,000 feet. The HDS-7 measures 8.8” W x 6.4” H x 3.5” D, comes with mounting hardware, and carries a two-year warranty.

The Lowrance HDS-7 with Expanded U.S. BaseMap and transducer ($999) is for sale on Amazon. You can also purchase the HDS-7 without the transducer ($949).

The post The Top Rated Nautical GPS Units appeared first on Reactual.

Harman Kardon Soundsticks III Computer Speakers

The Harman Kardon Soundsticks received editor’s choice on both PCMag and CNET for excellent sound performance and unique, aesthetic design. The frequency response range of 44Hz to 20KHz offers crisp definition for all forums: music, movies, and gaming. Power switch built in to the volume control on the subwoofer makes for energy efficiency. Satellite speakers can be angled to personal preference. You can own a piece of art and pop culture.

On the negative side, missing from this system is a remote control and a headphone jack.

The Harman Kardon Soundsticks III  is on permanent exhibit at New York City’s Museum of Modern Art. The third generation system was redesigned for 2010.

Features on this 2.1 sound system include 8 full-range transducers powered by a 10-watt amplifier in each speaker and 1 low-frequency, down-firing subwoofer powered by a 20-watt amplifier for bass. The system connects to 3.5 mm stereo devices such as computers and Mp3s.

The Harman Kardon Soundsticks III are on sale at Amazon for $145.81 or you can buy them direct from the Harman Kardon site.

Audioengine 2 Multi-Media Computer Speakers

Pros: Compact design fits well for a computer set-up. Superior sound clarity as reviewed by CNET, PCMag and Amazon customers who have given these computer speakers an average 4.5 star rating. Music and movies can be played at high volumes with no buzzing or distortion. Speakers are housed in hand-built wood cabinets to help amplify the bass.

Cons: The volume control is inconveniently located on the back of the speaker and doesn’t come with a remote control. PCMag thought the bass was slightly lacking compared with a subwoofer system.

Audioengine has successfully married compact size with superior sound and convenient features for a high quality computer speaker. Perfect for those who want a comparable subwoofer sound without the subwoofer, features on the Audioengine 2 include 2 audio inputs for both RCA and mini-jack, AC adapter, 15 watts of power per speaker with the left speaker housing power amps, Kevlar woofers and silk tweeters, and an auto-sleep power saving mode.

The Audioengine 2 computer speakers are on sale at Amazon for $199.00.

M-Audio Studiophile AV 40 Powered Computer Speakers

Pros: Excellent sound quality and ample low end bass levels for those who listen to music or watch movies on their computer. The editor’s review at CNET says “they sounded bigger, delivered more bass, and played louder than the other PC speakers we had on hand”.

Cons: Though there’s no subwoofer to make room for, these speakers will still take up considerable space on your desktop. They also weigh 14 pounds each so if you’re looking for portability, say in conjunction with a laptop or switching between devices, then these are not the ones.

M-Audios are larger than other computer speakers and pack a powerful punch with 20 watts per speaker, 4-inch polypropylene-coated woofers and 3/4-inch tweeters. Other features include RCA inputs on both speakers, a 3.5 mm jack, a headphone jack, and an integrated bass boost switch.

The M-Audio Studiophile AV 40 computer speakers are currently on sale at Amazon for $149.00.

Logitech Z623 Computer Speakers

Logitech has a long-standing reputation for making mid-range, quality computer speakers at an affordable price. The Logitech Z623 computer speaker system was one of PCMag’s Best of the Year products for 2010. It features a sleek, efficient design ideal for desktop listening. THX-certified, the 2.1 system offers 200 total watts of power with a 130 watt subwoofer and 2 35W satellite speakers as well as convenient inputs for multiple devices including computers, iPods, DVD players, and gaming consoles.

Sound quality is commended by reviewers at PCMag, CrunchGear, and Amazon. Clarity and power are unrivaled at this price range. Subwoofer presents a powerful bass that can be easily adjusted by the on-speaker nob. No buzzing at high volume. RCA and 3.5 mm inputs provide simple transfer between devices. THX certified.

The LogitechZ632 computer speaker system retails for $149.99, but is currently on sale at Amazon for $136.99

Klipsch ProMedia 2.1 Wireless Computer Speakers

The Klipsch ProMedia has a USB wireless transmitter that can stream audio from your computer to the speaker system from up to 30 feet away. Features a 2.4 GHz wireless signal and a total wattage of 120 watts between the 2 satellite speakers and subwoofer.

Pros: No pesky wires to clutter up the space. According to the review by PCMag, this system “packs so much power you’ll rarely raise the volume beyond half-way”. Using Apple’s Remote Application, iPhone customers can wirelessly access iTunes on their computer. Black cloth grilles are removable. It’s also THX certified.

Cons: No remote control. Power switch is inconveniently located on the subwoofer.

The Klipsch ProMedia 2.1 wireless computer speakers are only available through Klipsch on their website or via Amazon for $199.99

Cyber Acoustics CA-3602 Computer Speakers

This 2.1, 3-piece speaker system from Cyber Acoustics is our budget pick for a computer speaker set-up. There aren’t many tech reviews on this model, but the user reviews are outstanding with 109 5 star reviews on Amazon and 168 5 star reviews on Wize. Cyber Acoustics has been putting out quality, affordable audio equipment since the 80s. This system includes 2 satellite speakers, a subwoofer, a separate desktop control pod for volume, power, and bass, and a cradle for your Mp3.

Pros: The price: with an MSRP of $54.99, the CA-3602 may not be the cheapest computer speaker, but it will deliver a more powerful sound than other discount speaker systems. The low-end bass sound has been rated as excellent. The desktop control is convenient and features an LED light when turned on and also contains a headphone jack. A good choice as a basic computer speaker.

Cons: Speakers aren’t protected by a covering.

The Cyber Acoustics CA-3602 is currently on sale on Amazon for $37.23.

JBL Duet III Computer Speakers

Tight on space? The JBL Duet III computer speakers are perfect for a small desktop setting or for your laptop. They are simple to set up and offer versatility with an AC adapter and a 3.5mm jack to plug into a Mac, Mp3, PC, or CD player. The 2 satellite speakers put out 10 watts each of power. There’s no subwoofer here, but the Duet IIIs are slightly larger than the predecessor, the Duet II, and therefore provide a bit more bass, though still not as powerful as a 2.1 system.

Pros: The design is both aesthetically pleasing and convenient for work space. Both CNET and PCMag recommend these computer speakers for decent sound quality at modest volume levels. These would be good in a work environment. Speakers connect to each other with a standard RCA plug. The price is reasonable at the Amazon sale price of around $100.00.

Cons: Not for bass lovers or those who are looking for loads of power. There isn’t an auxiliary input to plug in a second device as most of the other computer speakers offer.

The JBL Duet III computer speakers are currently on sale at Amazon for $107.98.

The post The Top Rated Computer Speakers appeared first on Reactual.

According to Harry F. Olson in his book Maths, Physics and Engineering:

20 Hz is considered the normal low frequency limit of human hearing.

The lower the frequency of sound, the more difficult it us for human to hear it. So, in order for us to hear a sound under 20 Hz, it must be powerful.

We mostly hear infrasound through our ears, but at higher levels it is possible to feel infrasound vibrations in various parts of the body.

Examples of natural events that produce ultrasound include: lightning, earthquakes, volcanoes, bolides (exceptionally bright fireballs), aurorae and surf.

Human can produce ultrasound too, examples include: sonic booms, mechanical sounds from engines, subwoofers and transducers.

Perceiving Sound Under 20 Hz

We all perceive infrasound differently — an infrasound wave might be perceived as loud to one individual, but another might not perceive it at all. Wikiepedia says:

When pure sine waves are reproduced under ideal conditions and at very high volume, a human listener will be able to identify tones as low as 12 Hz.

Below 10 Hz it is possible to perceive the single cycles of the sound, along with a sensation of pressure at the eardrums.

If you want to produce infrasounds, you can try a tone generator.

Paranormal Investigations

Infrasound can also cause feelings of awe or fear in humans, because it is not consciously perceived. It can be described as “shivers down your spine” or other weird sensations. An experiment in England was set up to study the effect of infrasound, Participants reported feeling uneasy and fearful when infrasound was introduced. After conducting the experiment, Professor Richard Wiseman said:

These results suggest that low frequency sound can cause people to have unusual experiences even though they cannot consciously detect infrasound. Some scientists have suggested that this level of sound may be present at some allegedly haunted sites and so cause people to have odd sensations that they attribute to a ghost—our findings support these ideas.

Some film soundtracks make use of infrasound to produce unease or disorientation in the audience. Irréversible is one such movie, as is Paranormal Activity.

Here is another infrasound investigation story from Wikipedia:

Research by Vic Tandy, a lecturer at Coventry University, suggested that an infrasonic signal of 19 Hz might be responsible for some ghost sightings. Tandy was working late one night alone in a supposedly haunted laboratory at Warwick, when he felt very anxious and could detect a grey blob out of the corner of his eye. When Tandy turned to face the grey blob, there was nothing.

The following day, Tandy was working on his fencing foil, with the handle held in a vise. Although there was nothing touching it, the blade started to vibrate wildly.

Further investigation led Tandy to discover that the extractor fan in the lab was emitting a frequency of 18.98 Hz, very close to the resonant frequency of the eye given as 18 Hz by NASA (see this PDF file). This was why Tandy had seen a ghostly figure—it was an optical illusion caused by his eyeballs resonating. The room was exactly half a wavelength in length, and the desk was in the center, thus causing a standing wave which was detected by the foil.

Tandy investigated this phenomenon further and wrote a paper entitled The Ghost in the Machine (PDF file here). Tandy carried out a number of investigations at various sites believed to be haunted, including the basement of the Tourist Information Bureau next to Coventry Cathedral and Edinburgh Castle.

The post Below 20 Hertz: The Rumbling Realm Of Infrasound appeared first on Reactual.