Hertz HSK 165XL

Hertz HSK 165XL
From the municipality of Potenza Picena, Italy, the music lovers at Elettromedia were kind enough to send me a pair of their Hi-Energy component speakers.

If you don’t recognize the Elettromedia name, they are the parent company of such highly regarded brands as Hertz and Audison. The speaker system they sent for my perusal is the top of the line product in their Hi-Energy series, and priced at $699.00, oriented towards value conscious audiophiles.

I have enjoyed some previous experience with Hertz loudspeakers, and I’ve always come away generally impressed, so I was looking forward to playing with this “best of the series” system.


The speakers arrived in good condition thanks to a well-designed carton that holds everything securely in place, and in the interest of the planet, is 100% recyclable to boot! Included in the carton is pretty much everything you’ll need to install the system in a variety of applications, including four different types of tweeter mounting configurations. Whether you need to flush mount or surface mount the tweeters, the included hardware will have you covered. The grilles for the 6.5-inch mids are a 3 piece design, there is a black ABS plate that mounts behind the driver, and is used to retain a black perforated metal cover. Or you can just use the silver colored “kick protector” grille for a different cosmetic look that mimics the tweeter, or for even more options, you can use both together. Seems like a lot of options for parts that generally get relegated to a box under the installers workbench. Does anyone use grilles anymore? The drivers used in this system are very well constructed pieces that would be at home in a good home system.

Hertz HSK 165XL

Rated at 150 watts continuous, the 6.5-inch mid-range/woofer driver uses a cast aluminum basket that mounts in a 5.75-inch hole. The driver is 3 inches deep, and has 4 mounting screws 90 degrees apart. Each component of the mid-range is designed with high performance in mind. For example, in an effort to minimize rear wave interference, the basket uses three sturdy “spokes” instead of the usual four or more and has an aerodynamic shape to the spider landing. The basket also incorporates a vented bottom plate, and a radial venting system to improve heat dissipation. Other thoughtful performance enhancements include an oversize magnet structure and a 1.2-inch copper clad aluminum voice coil, wound on a low mass Kapton former.

The cone is also unusual in its design Hertz calls a V-cone. Constructed of pressed damped mesh fibers, it has a special shape said to improve off-axis dispersion and high frequency detail. The cone is attached to the basket via a 3.5-inch linear Nomex spider below, and on top by a butyl rubber surround. A deep V-shaped dustcap completes the V-cone design. The wire terminals are the usual push on spades and because they are very solidly mounted, won’t cause concerns of terminal breakage when connecting them. Interestingly, the speakers require female spade connectors, but neither wire, nor any connectors came in my system. This can be a pain for the "do-it-yourself" enthusiast, who may not have these connectors in the home toolbox (but for 700 bucks, I at least expect connectors!).

The tweeter used in the Hertz HSK 165XL system is also specialized for the application. Utilizing a 1.1-inch Tetolon fiber dome, neodymium magnets, and a back damping chamber, the Hertz tweeter has an over surround waveguide type grille aperture, said to result in a “diffused off-axis dispersion.” The tweeter comes with about 8 inches of wire already soldered to the terminals.

Crossover networks for the system are housed in nicely finished enclosures that have an easy to remove, but secure top cover. Mounting screw locations are inside, for a more finished appearance when installed, and the crossover housings use a really nice tactile “rubber” sort of finish with a silver contrasting plastic. Inside, there are -12dB low pass and high pass filters for the mid and tweeter. The tweeters use a crossover point of about 2.5kHz, which is good to know if you intend to use the system in an all active crossover application. Iron core inductors are oriented to prevent magnetic crosstalk, and polyester capacitors are used in the tweeters filter. The resistors for tweeter attenuation and mid alignment are mounted high off the PCB for maximum cooling and reliability. Speaker and amp connection terminals are Phillips head screws with a captured square washer underneath. Tweeter level control is accomplished by selecting one of three terminals, +2dB, 0dB or -2dB.

After a short break-in period, armed with a selection of my favorite CD’s, I sat down to listen to this high performance system in my dedicated listening room. Regular readers of my speaker evaluations will recall that I prefer to do my listening in a very quiet room with controlled acoustics, so my listening experiences and opinions are not colored by all the variables encountered when listening in a vehicle. With the system mounted in the baffles and the tweeters connected to the 0dB positions, I began with Diana Krall’s, “S’Wonderful” from the CD “The Look of Love.” This is a very good track for evaluating how well the speakers re-create her fantastic vocals, and also for getting a feel for the recreation of a sound stage. The first thing I noticed, was how warm and natural the midrange sounded! The timbre of her voice, and the ambience in the recording was plainly evident. Switching to Dire Straits stellar “Brothers in Arms” CD, I played “Ride Across the River.” Again, the Hertz system had a smooth warmth and natural timbre, and very good midrange definition! I thought the tweeters were a bit on the polite side for my taste, so I increased the level to the +2dB setting, and the top end then had more of the detail and sizzle I expected from Mark Knopfler’s guitar work. Bass output is strong and smooth with good definition and impressive clarity.

I listened to the system for about 3 hours, which only happens when I really am enjoying myself, so the speakers obviously sounded pretty darn good to me. Whether I played Pop, Rock, Jazz, Classical, or Rap, the Hertz system simply reproduced the music as intended, which is all you can ask of a great speaker system. Unlike some less proficient systems, the Hertz HSK 165XL’s did not require any tone adjustments when switching musical genres or when making large changes in volume. And I did get them rocking for a while, at volumes high enough to not be able to speak over, and the system had no complaints at all. My only relatively minor criticism was while the mids are quite good off axis, I found the tweeters to be fairly diffused and more than a bit subdued when I got 30 to 45 degrees to the side. I’d suggest mounting the tweeters as high and on-axis as possible with this system, to be able to fully appreciate their high end capabilities. A chat with Hertz confirmed this, as they recommend mounting the tweeters in the cars A pillars, and as on axis as possible for best performance.

Hertz HSK 165XL image_opt

After my listening was done, I moved the system into my speaker lab and ran frequency response plots as well as impedance curves. No big surprises, the system measured just like it sounded, nice and smooth, with a bit of a bump down low which is where the “warmth” of the sound came from. My system showed a woofer resonance at just over 70Hz, and another small impedance rise at about 1500Hz, no doubt the resonance point of the tuned chamber tweeter.

Generally speaking, this is a very excellent competent system, with an uncommon smoothness and natural tonality when set up correctly. I liked the sonics of the Hertz components, particularly when I increased the tweeters output, and sat on axis to them. The system will handle high power amplification, and doesn’t object to being played loud, but also doesn’t need a lot of power to sound great. While not an inexpensive system at around 700 bucks, I have heard systems costing twice as much that certainly didn’t sound twice as good, so it’s still considered a good value in my book! As always, you should evaluate the sound of any speaker system for yourself, before plunking down your hard-earned greenbacks. For more info visit: www.hertzaudiovideo.com

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