Audio/Video Alternatives

Does a DLNA video-streaming A/V receiver exist? Also, some options for adding a soundbar to a home theater system for everyday TV viewing.

I plan to upgrade my very old Sony 5.1-channel A/V receiver sometime soon. The main feature I’m looking for in a new model is the ability to stream video from a DLNA server for output over HDMI. I know that many A/V receivers can stream music from a DLNA server, but I haven’t come across a receiver that also specifies video. I currently use a Sony Blu-ray player to access video from my PC and could continue with that method, but I’d like to know what, if any, video-streaming receivers are out there. Mark Thompson King George, VA

It’s true that many network-capable A/V receivers can stream audio via DLNA server software running on a PC or Mac, but ones that also claim to handle video are considerably more difficult to find. Sony’s specs for its top-of-the-line ES models suggest that they will retrieve and render video along with photos and audio via DLNA, but I have yet to come across any other receivers that promise to perform the same task.

In this particular case, though, you should be careful what you wish for. Sound &Vision’s A/V receiver reviews usually confirm that, when it comes to media streaming, the units test poorly compared with the inexpensive dedicated media receivers available from Western Digital (WD TV Play and Live), Apple, and others. The GUIs of A/V receivers can be barren and difficult: to navigate, the streaming performance sluggish or spotty. For those reasons alone, it might be better to buy a basic А/V receiver with no networking at all and pair it with an HDMI-connected media receiver that offers spiffy, reliable streaming and a graphically rich interface to navigate content. As you already know from experience, some Blu-ray players also work as DLNA audio/video streamers (that’s how I do it myself), so there’s no shame in sticking with that method. Continue Reading →

Best Air Purifier for Allergy Sufferers: HEPA Air Purifier Review

Honeywell-HEPAEven the most effective air purifiers for allergies, from dust allergies to cat/dog allergies, bacteria mold allergies and so forth, are not able to completely eliminate irritant from air. You need an air purifier which eliminates contaminants as well as particulates which are microscopic, as well as ones which cannot be eliminated from your home’s main air cooling and heating filtration system.

Suffering from allergies?

You might suffer from allergic reactions, but you should not have to worry about it at home. Best air purifier reviews are specifically written to help individuals with allergic reactions. The purifiers and filters are comparatively low-priced as well as easily accessible.

These kinds of purifiers will clear the environment of 99% of contaminants. These air purifiers have filters that are built to eliminate the allergens. These gadgets have been enhanced so that they can work discreetly at home.

Mildew, Bacteria and Mold

There are lots of air purifying systems which pull air into the “killing chamber” and are meant for destroying bacteria and mold. They have the capacity to clean the air that they pull into them. Since a few of these smaller purifiers have smaller fans it will take a long time in order to draw the air which resides in a place right into them. Continue Reading →

Stereo Spectrograph


Most stereo systems have some kind of music level indicator, The indicator may be as sim pie as a set of LEDs, ordinary low-voltage lamps or V-U (volume-unit) meters. These were later replaced by bar-graph type LED indicators. Though attractive, they provide only one-dimensional ‘movement’ of LEDs with the music. Now this system has also become very common.

Presented here is a spectacular system to replace the outdated music level indicators. This system is capable of providing a smart, two-dimensional ‘dancing’ effect on a square matrix of 100 LEDs.


In this system, out of 100 LEDs arranged in a square matrix, only one LED glows at a time and it keeps dancing within the so-formed LED array along with the music being played or the stereo system. The movement or dancing of the LED depends basically on the ‘stereo’ effect of the music Hence, the system may be called s stereo spectrograph.

This system ’s working depends not only on the type of music being played but also on the ‘stereo’ effects of the music. Greater the stereo effect, hater the movement of the dancing LED. As you know, a stereo signal is recorded or played on two independent channels which arc purposely isolated from each other. Therefore, at every instance the signal strengths of the right and left channels are different from each other. As shown in the schematic block diagram (Fig. 1).

The audio signals from the left channel are made to force the glowing LED to move along the vertical columns and the signals from the right channel provide the movement of the LED along the horizontal rows. Hence, we see ‘movement’ of the glowing LED in a two-dimensional square area where t he vertical and horizontal movements are isolated from each other* just like audio signals in both the channels.

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