Archive for August, 2009

Review By: Kevin Massy

The Eclipse AVN2210p is a novel addition to the aftermarket in-car navigation scene. It is the first system we have seen that combines the functionality of an in-dash GPS navigation device and media player with that of a standalone portable navigation device. It does this by using a TomTom Duo portable GPS device in combination with a unique docking mechanism, enabling drivers to insert and remove the touch screen navigation module at will. In its in-dash mode, the system can be used to play a variety of digital audio formats, including MP3 and WMA discs, and input from portable digital audio players via a front-mounted USB port. It can also be used right out of the box as a very useful Bluetooth hands-free calling interface with some advanced options, including instant phonebook transfer and text message playback.

Design
Apart from the hard button used to switch between map and audio view, all of the navigation functions on the Eclipse AVN2210p are controlled using the TomTom Duo's touch screen. Due to its dual functionality, the navigation screen on the Eclipse AVN2210p is far smaller than those on other double-DIN-size in-dash units. However, this size restriction does not impede functionality as much as it might, and maps and menus remain legible thanks to the TomTom's bright and colorful graphics. For digital audio playback, the Eclipse AVN2210p makes use of the same rotary volume knob/four-way push-button selector as that in the Eclipse CD3100. Curiously, disc-based audio cannot be controlled via the LCD touch screen, but media played via the USB port can.

Navigation
Whether the TomTom Duo device is docked or undocked in the AVN2210p cradle, all navigation functions are performed using its touch screen. Programming in a destination is straightforward, thanks to the colorful icons that populate each menu level. Destinations can be entered by address, ZIP code, city center, or cross street. Punching in an address on the system's touch screen keypad is easy and very quick, thanks to the impressive refresh rate of the menu level screens, and route calculation is equally swift. After selecting a route that meets their specifications (fastest, shortest, avoiding freeways, designated arrival time, etc.), drivers are given a whole host of features to preview their journeys before setting out. Specific route-preview options include: browse as text (gives a list of turn-by-turn directions); browse as images (shows each turn on the map); browse route on map; show route demo (runs through a virtual tour of the route, complete with turn-by-turn voice directions); and a route summary. When satisfied with the proposed route, the system gives turn-by-turn directions to a destination, either via the car's speakers (with the nav system docked) or via the TomTom Duo's built-in speaker. During route guidance, the screen displays roads in bright colors, with suggested turns illustrated with big, green arrows.

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The AVN2210p gives drivers a host of options for previewing their routes.

The TomTom Duo does not include text-to-speech functionality to enable the system to call out individual road names, but a useful bar on the bottom of the screen displays the name of the upcoming street, which is the next best thing. With the TomTom device docked, the GPS signal is stronger, as it is connected to an external antenna that can be mounted on the car's dashboard. In standalone mode, the signal is weaker, and we found that the system lost its bearings a couple of times when driving between tall buildings in downtown San Francisco, taking up to a minute to regain a GPS fix at times. Generally, the GPS system was quick to reroute when we purposely defied it by missing turns or going the wrong way.

One observation that is worth making, however, is that the system makes no distinction between driving directions (for when the TomTom unit is docked) and pedestrian directions (for when the TomTom unit is detached), meaning that all suggested routes are given with respect to road restrictions, such as one-way streets. We would like to have seen a pedestrian mode in the vein of other standalone portable GPS devices. Another niggle we have with the standalone GPS device is that its spoken directions are barely audible on a busy street, even with the volume turned up to maximum. And to round out our criticism of the standalone TomTom Duo, its battery life registered at less than two hours--far beneath the five-hour mark that most standalone GPS devices manage.

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We like the turn-by-turn route guidance, but with the TomTom Duo in standalone mode, spoken directions are difficult to hear on busy streets.

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"Kicker ZX300.1 is the perfect car stereo amplifier for those who are fond of bass. This amplifier is designed with high-end amplification to set standards for a powerful sound and a unique look would make your amplifier stand apart from the various other amplifiers. The Kicker ZX300.1 mono subwoofer would control your subs with nearly 300 watts of power. This unit does not have a peak power rating and you can ensure that the amplifiers CEA-2006 compliant rating would mirror a true measure of its capabilities. Similar to all the kicker amplifiers the Kicker ZX300.1 is also designed with a high quality internal component to offer you a reliable performance. The Kicker ZX300.1 features an in built low pass filter that helps in removing high frequency that is generated by the amplifiers output, so that you get the most from your subwoofers. Apart from this, there is a subsonic filter that eliminates the intense low bass that usually hampers the system efficiency. You can use the bass increase control to make a little more low-end bump or you can also turn it on and off with the additional wired remote control.

Features:
The Kicker ZX300.1 features a CEA 2006 complaint where the power ratings are calculated according to the firm standards dictated by the Consumer Electronic Association (CEA). The unit also features a speaker level input or a high level input connection that allows you to use it with a source that does not have RCA preamp level output. Along with this, the unit also features a remote bass level control that allows you to adjust the output levels of the amplifier from anywhere in your vehicle. When you attach the remote bass level control to the mounting bracket it will have the dimension of W=2.204″, H=1.171″, D=2.253″ that includes the knob. There is also the KickEQ bass enhance circuit that offers a 12 dB signal increase at 40Hz."

KICKER 08 ZX3001 R CLASS D AUDIO AMP MONO AMPLIFIER
KICKER 08 ZX3001 R CLASS D AUDIO AMP MONO AMPLIFIER
Paypal   US $114.95
KICKER ZX3001 350W MONO BLOCK AMPLIFIER FACTORY REFURB
KICKER ZX3001 350W MONO BLOCK AMPLIFIER FACTORY REFURB
Paypal   US $118.74
KICKER ZX3001 CAR STEREO MONO BLOCK SUB AMP AMPLIFIER
KICKER ZX3001 CAR STEREO MONO BLOCK SUB AMP AMPLIFIER
Paypal   US $151.19
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h113KACX10D-fp

"The design is fairly clean overall. Connections are made by removing the fascia shield via the 2 allen head screws allowing access to the terminal strips for connections. The first thing I noticed is the weight. This amp is light. Meaning, there can't be that much inside for a clean performer. Sure enough, this is a plane jane stripped down amp, with limited MOSFETS.

Here's the specs:
Class D Mono Power Amplifier
K-STAT technology
Dual sigma drive
Dual power supply with two transformers
Maximum Output Power: 1200 Watts
RMS Power 4-Ohm: 300 Watts x 1 (20-200Hz, 0.5%THD)
RMS Power 2-Ohm: 600 Watts x 1 (100Hz, 0.5%THD)
RMS Power 1-Ohm: Over 600 Watts x 1
Signal To Noise Ratio: 80dBA (Ref:1 Watt into 4Ohm)
Infrasonic Filter: 15Hz, 25Hz, -24dB/oct
Bass Bosost ready (Wire remote): 40Hz-100Hz, 0dB-+18dB
Low Pass Filter: 40-200Hz (Variable), -24dB/oct

OK... Now for the truth. CEA 2006 rating is 1% THD. Meaning it's a Loose noise monster. Secondly...Where's the second power transformer... There sure isn't one on the board. Lastly, do the math. 40A fuse X 13.8V = ~552W peak load before the fuse pops. Generally, this formula works for class AB the best. Digital amps are more efficient. Based on the number of Mosfets...there's no way this amp is getting near 800 or 1200 watts.

This looks like a revised layout from the older KAC series amplifiers, with near identical componentry. There is so much sparce space on this amplifier board, there's no reason to have the heat sink this large. The other thing I observed... is the solder joints on the MOSFETS on the amplifier side of the board looked relatively poor and high in flux.
Under high load, I would expect a failure condition.

If your looking for just cheap sound reinforcement and not worried about quality, then pick this one up. If your looking for Better Regulated, true digital class D, and better overall circuitry...look on to either Xtant (before their MTX aquisition), JL, or Directed."

"The Kicker Comp 12 is the entry-level in the Kicker's line of subwoofers, but that doesn't mean they skimp on this woofer. The cone, coupled with the Inverted Dustcap, forms a very solid piece that can withstand high pressure in a small sealed enclosure. The polyester foam surround are stitched to the cone to eliminate the possibility of separation, the rubber speaker gasket serves as a seal and protects the stamped steel frame. The sub has a 40-ounce booted magnet with a vented and extended pole piece, and also vents around the single voice coil to draw cold air to cool off the voice coil, Kicker calls this "Perimeter Venting." Connections are via standard solder-type with large gauge wires going to the voice coil, with care done so the wires won't bounce off the cone and make noise during high excursion.

I bought this speaker from a friend of mine for 40 bucks, but he paid 70 when brand new. I have to note that I have the 8-ohm version of the sub instead of 4-ohm, which was suitable for home use. Now this friend of mine is deep into bass and he has serious bass power in his Explorer, consisting two batteries and a 1-farad cap just for one USAmps 2000x that runs two 15 inch Eclipse Titanium cone "Professional Subwoofer." On a quiet night I could hear his bass from more than a quarter mile away. So, basically he bought this speaker just for kicks, he made a very small(and completely wrong) vented box for the sub and ran the 1Hz to 100Hz test tone with his beat-up home receiver, with about 150 watts of distorted power going into this poor thing. The vented subwoofer obviously went into overload at such low frequency, it maxed out its peak-to-peak excursion limit which was about an inch and a half or so, we could very well smell the heating of the voice coil, but that was about it, it didn't even bottom out. This subwoofer took the serious abuse and recovered without a hitch, but as for his beat up receiver it went into gross overload and shut itself down. At that time I was in a need for a temporary sub in my room, so I bought the speaker and made a slot-vented enclosure that would produce higher SPL at 35Hz and above. I listen to music a lot more than I watch movies, so trading the missing subsonics for higher SPL wasn't a big deal. I ran a 150 watt sub amp to this baby and was greeted with strong kick drums and midbass, and it sounded really fast and accurate consider the box I made was purely for SPL. I put in some dance music with strong 60Hz bass kick, and my amp ran out of steam before the speaker moved more than half an inch peak-to-peak. Convinced for its SPL mojo, I put in The Matrix DVD and the gun shots was quite strong, but shotgun shots sounded like a pistol, and the ultra-low explosion information was missing. Please note that I made a box that DOES NOT produce subsonics, I plugged the slot port with a bunch of clothes and the sub did indeed went a lot lower, about as low as 25 Hz. Watching movies was a lot more exciting this way, but the midbass would suffer and playing music had less impact.

Conclusion:
This sub was built and sounded more than its price would suggest. It took abuse and recovered fine, it could be made for SPL, sound quality, or sub-bass, depending on the design of the box. Overall I really liked this subwoofer, even though it was only a temporary substitute before I upgrade to a even better subwoofer. If you are looking for a bargain subwoofer with performance, this is for you."

DUAL 12 KICKER SUBWOOFER BOX C12 SUB ZX4001 AMP KIT
DUAL 12 KICKER SUBWOOFER BOX C12 SUB ZX4001 AMP KIT
Paypal   US $373.95
KICKER DUAL 12 AMPLIFIED TRUCK C12 SUB BOX ZX4001 AMP
KICKER DUAL 12 AMPLIFIED TRUCK C12 SUB BOX ZX4001 AMP
Paypal   US $324.95
2 KICKER 10C124 12 Comp CAR SUBWOOFER pair C12 4 Ohm
2 KICKER 10C124 12 Comp CAR SUBWOOFER pair C12 4 Ohm
Paypal   US $154.95
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Each roll on a typical subwoofer spider has a uniform height but because the center area is subject to increased stress when for example, a subwoofer's excursion is especially large - this area can become stretched out, leading to breakage in the spider and limiting higher power handling. However, Kenwood's new spider roll gradually becomes higher towards the center, enabling this area to withstand more stress with less stretching. The design goal was to gradually transfer up-down movement outward to reduce stretching in the center area. As the spider's outward portion has more surface area to better dissipate stress from the center, this helps to reduce mechanical damage during increased excursion and enables the subwoofer to withstand more power.