Gefen EXT-WHDMI wireless HDMI extender review: Gefen EXT-WHDMI wireless HDMI extender

The transmitter has three inputs: two HDMI and one component video, and all of the supported resolutions work via both HDMI and component. There's also a separate stereo analog audio input on the transmitter that has a corresponding output on the receiver. Unfortunately, stereo audio on the transmitter can't be piped into the HDMI output on the receiver; you'll need to connect the audio output separately. However, the provision of an analog audio connection lets you connect both component-video and legacy DVI devices that require a separate audio connection. In that vein we'd have liked to see a provision for optical or coaxial digital surround sound audio, like the Sony has, but it's not available.

Gefen EXT-WHDMI
An HDMI output and an analog audio output, plus a port for an IR blaster, comprise the receiver's back panel.

The Gefen also lacks the included IR blasters found on the Sony. Both the transmitter and receiver have IR blaster and receiver jacks, but for some reason the company didn't include the blasters.

Gefen EXT-WHDMI
Two HDMI cables are included in the box, but no IR blasters are included.

The EXT-WHDMI works with HDMI CEC, a protocol for sending commands over HDMI. To use it, you point your remote control at the display, which sends the commands over the Gefen's wireless connection back to the source device. Both the TV and the source device must be HDMI CEC compatible.

In our testing, this feature worked as advertised. We were able to control our Panasonic Blu-ray player using both a Sony and a Samsung TV over the Gefen by simply pointing the remote at the TVs and having the player respond. Of course, your results will vary depending on which devices you have connected.

Performance
Overall the video quality of the EXT-WHDMI was very good. All of the pop and detail of 1080i and 1080p video was in evidence, and the advantage of being able to transmit 1080p/24, with its inherently smoother and more filmlike motion compared with 1080i (when seen on compatible displays) should be a boon for videophiles. Speaking of smoothness in moving video, the Gefen appeared to maintain the source's frame rate without introducing any of the stutter or dropped frames we experienced on the Acoustic Research HDP100.

The Gefen isn't quite as good as using a standard HDMI cable, however, and in at least one key video quality aspect we tested--false contouring--it also fell a bit short of the Sony DMX-WL1. With program material, as opposed to test patterns, we give the video quality nod to the Sony, despite its inability to handle 1080p. But the Gefen scores higher in Performance overall, thanks to its more stable signal and still-solid video quality.

We compared the three (Gefen, Sony, and standard HDMI cable) using the Panasonic TH-65VX100U as our reference display with a variety of sources: PlayStation 3, Panasonic DMP-BD35, and DirecTV HR20 satellite box. We'll restrict most of our video-quality discussions to the highest-quality source, Baraka on Blu-ray delivered via the PS3.

Our setup placed the Sony and the Gefen transmitters and receivers next to one another in the same room, with about 20 feet of distance and line-of-sight between transmitters and receivers. There was anywhere from 4 to 10 active Wi-Fi networks in the area during testing, according to our laptop PC.

The major weakness we could discern with the Gefen was false contouring, which appeared as subtle lines of gradation in nearly flat fields and fine transitions that wasn't visible in the images conveyed by the Sony or by regular HDMI cable. During the beginning of Chapter 8 of Baraka, for example, we saw evidence of faint contours in the water beneath the ascending flock of birds, and also a very faint pattern that almost looked mottled in the brownish lake. Contours were even more obvious in the background graphics of the PS3, and again neither of the two comparable methods showed these contours. It's worth mentioning that this kind of contouring was infrequent and subtle when it did occur in Baraka and other sources we watched.

At times, the image delivered by the Gefen also appeared just a bit noisier than via the cable or the Sony wireless transmitter. The beginning of Chapter 10, for example, includes a very slow pan over a Brazilian shantytown, and there was a bit more noise in the bricks of the buildings and the green of the hillside when we watched the Gefen. We doubt the difference would be visible outside of side-by-side comparisons, however, and the noise test material from the HQV Blu-ray Disc looked basically the same between all three of the HDMI transmission methods.

There were also a few areas where the Gefen beat the Sony. We noticed minor edge enhancement around text on the Sony that wasn't visible on the Gefen, and in test patterns it was even more obvious. Thin lines on the Sony, such as the graphics around some menu elements on Blu-ray Discs, also showed slight shimmering on the Sony whereas the Gefen was completely stable. Numerous test patterns also looked significantly better on the Gefen, especially resolution--the Gefen was perfect, while the Sony broke up, flickered, or lost definition in the highest-detail areas.

In fact, a couple of the toughest patterns on the Digital Video Essentials--HD Basics test Blu-ray (Luminance and Chroma Zone Plate) would "break" the Sony's communication, forcing us to cycle its receiver's power before we could continue watching. The Gefen didn't look as good as the HDMI cable on those patterns, but its communication remained stable. For the techies out there, it did appear as if the Gefen was truncating chroma (color) resolution, but again the difference was quite difficult to spot outside of test patterns.

During one pattern, a jaggies test from HQV, the Gefen stuttered quite a bit about half the time--the other half remaining smooth--while the Sony did not. We don't consider this a huge failure since we couldn't duplicate it with other material.

We made these comparisons with the Sony in 1080i mode, since it doesn't support 1080p. When we switched to 1080p/24 the Gefen worked fine, delivering the smoother video without that subtle hitching motion seen on film sources displayed at 1080i, for example in the pan over the buildings in Chapter 12 of Baraka. Again, you'll need to connect a compatible display and to pay pretty close attention to appreciate the 1080p/24 difference, so the Gefen's capability to handle that format is probably an advantage only videophiles will care about.

Between the two wireless systems, the Sony evinced significantly less delay than the Gefen, which becomes especially important to video gamers. When watching via the Gefen and flipping around to various items in the PS3 menu, for instance, we experienced maybe a third- to a half-second delay between pressing the key on our controller and seeing the result on the screen. The delay on the Sony DMX-WL1 was much shorter--enough so that less-twitchy gamers might not notice--and, of course, we experienced no delay at all with the HDMI cable.

According to Gefen's user manual, the system can transmit two-channel PCM and multichannel Dolby Digital and DTS soundtracks, but it couldn't do the latter in our testing. It failed to transmit a Dolby Digital soundtrack that passed with no problems via a standard HDMI cable. We don't consider this a huge deal, however, since most installations won't require multichannel audio on the receiving end.

Finally we moved the Gefen into another room about 30 feet away and through a door. The image appeared but was broken up and essentially unwatchable. On the other hand, in our original configuration, the transmission remained stable regardless of whether we walked between the transmitter and receiver, placed components in front of the antennas, or stashed the receiver behind the TV. In general, the Gefen was quite stable overall as long as we kept within the 30-foot range.

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Gefen EXT-WHDMI wireless HDMI extender

Part Number: EXT-WHDMI Released: Jan. 15, 2008
MSRP: $999.00 Low Price: $1,080.34 See all prices

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  • Release date Jan. 15, 2008
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