Sony XMZR704 4/3/2 Channel ZR Series Amplifier (Black) Review

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(More customer reviews)Clearly it's not the highest end amplifier on the market, but for the price it's worth it. I almost settled for an Alpine amp, yet later learned that the base boost was either an on or off feature, and I wanted variable bass boost. I found this Sony Xplod xm-zr704 after some searching on Amazon. It seemed pretty decent so I researched it further and purchased it. It arrived quickly with the Super Saver Shipping.
CHANNELS:
If you don't know what the difference between a mono channel and a 4 channel is, it's a very simple thing to learn.
Mono channel - 1 channel to power 1 speaker, usually a mono amp powers a sub-woofer.
2 Channel - 2 channel amps seem to be the most common amplifiers out there. A two channel amp can power 2 speakers (like both rear or both front but not one front and one rear speaker)
3 channel - Likely a 3 channel amp would power two speakers and a sub.
4 channel (LIKE THIS AMP) Powers 4 speakers. (both front and both rear)
If you get a 5 Channel it can power 4 speakers and a sub.
Note though that the more channels you use the more you may need to spend on wiring and necessary materials.INSTALLATION
Note, for those of you first time amplifier buyers, be aware that the amplifier DOES NOT come with all the necessary wiring. Amplifiers usually do not come with the wiring, and they are another expense you must add in. And if want to use all four channels instead of just two, you may need to add some RCA adapters, which will cost more, varying on what you buy. Overall I spent about: $140 - $180 extra dollars on some decent wiring and all the extra adapters / materials I needed to put all 4 channels to use.
I got my amplifier installed professionally (NOT BEST BUY) and that's what I recommend you do if you have any doubt on messing up your car. Getting it installed can be fairly pricey varying on where you get it done. Car audio shops have all the necessary wiring and materials you need if you don't have them already. Yet if you purchase from them, don't be shocked if that adds to the bill significantly.CONCLUSION
After a long day of waiting for my car to get my car back from the audio shop, I was very pleased with the results. It made my stock speakers in my 2002 accord sound much better. The sound quality is now clearer, sharper, has more bass. Overall it improved my stock sound to something much greater. IT WAS WORTH IT!


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Kenwood KAC-6404 500-Watt Max Power Stereo Bridgeable Amplifier with Variable LPF/HPF Review

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(More customer reviews)i would not recommend this amp...i bought it for 100$ and i thought it was a waste of money. I got it installed in my car and immediatly took it out 2 minutes later. It was powering a 10 inch subwoofer and when I turned up the volume the amp would cut out. Needless to say I returned it after that

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Pioneer Gm-D8400M Mono Amplifier With 1200-Watt Max Power Review

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(More customer reviews)The Pioneer GM-D8400M is an amazing amp. I have it pushing two 10" subs in my Chevy Avalanche. The remote for it is great. I can keep the bass at the perfect level and not over power the music. Love it.

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Pioneer TS-D1320C 5.25-Inch Rev-Series 180-Watt Speaker Package Review

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(More customer reviews)Installed in a 2004 Taurus in the front doors. I flush-mounted the tweeters in the triangle-shaped A-pillar cap by the side mirror. Used a 1 7/8" forestner bit to make perfect holes in the plastic. Looks super slick. Sound was clear and sharp, but distorted easily at first, even powered only by the factory HU. After about eight hours' listening time, however, the highs were more defined and natural, the mids bloomed into a rich fullness, and the bass is pretty good for their size, but I have a twelve in the trunk so I got these for the sound quality, not bump-ability. Awesome set of speaks, worth the price. Comes with an adapter plate for 6x8 locations, which I used, and I put the crossovers inside the door. Comes with everything but speaker wire. Intermediate automotive audio skills required. Tested with Outkast's Speakerboxxx/The Love Below, Dave Mathew's Band's Before These Crowded Streets, and Alice in Chains' Jar of Flies. The hip-hop sounds slick but breaks up fast due to scooped eq'ing in the mix. The Alice in Chains is very good quality, but the DMB record sounds the best. Also tried Steely Dan, various tracks with studio monitor-like accuracy in my car. Awesome!

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This 5-1/4-inch component system from Pioneer delivers 180 Watts of maximum power (35 Watts nominal), and offers the flexibility and improved soundstage of a component installation. The woofers are rock-solid, literally--basalt fiber (interwoven with aramid) is extremely rigid and lightweight, for serious sound integrity. Pioneer's rear chamber tweeter enclosures boast an extended mid-range frequency, which means improved vocal imaging. And the included crossovers ensure a smooth response from both.

TS-D1320C Specs


Pioneer Car Audio SystemsPioneer's Mobile Business Group is known for offering the kind of in-car products that make driving more enjoyable by offering high quality audio and video, seamless connectivity and ease-of-use. Its focus is on the development of new digital technologies including audio video, navigation and satellite radio, while maintaining its strong heritage in products for car audio enthusiasts and sound competitors.
What's in the Box Pioneer TS-D1320C Component Speaker Package (Two Woofers, Two Tweeters, Two Crossovers), Mounting Hardware, Installation Guide

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Crunch Ground Pounder GPV1000.2 1000 Maxx Watt Power A/B Class Two Channel Amplifier (Silver) Review

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(More customer reviews)I REALLY DONT KNOW HOW PEOPLE CAN GIVE THIS A BAD REVIEW. YOU NEED TO MAKE SURE EVERYHTING IS CONNECTED RIGHT PEOPLE. LOOK AT A WIRING GUIDE TO FIND THE CORRECT OHMS FOR YOUR SUBS AND AMP. MAKE SURE THEY ARE COMPATIBLE. I CONNECTED THIS GROUND POUNDER TO 2 Quantum QBCW12D4 Beta Series 12-Inch 4 Ohms DVC Subwoofer WHICH I GOT FROM AMAZON FOR A DAM GOOD PRICE AND A PORTED BOX ALSO PURCHASED FROM AMAZON AND THIS AMP MAKES THEM BUMP! I HAVE A PIONEER PREMIER 50WX4 HU AND MY LOW AND BASS SETTINGS ARE AT -6. MY HU HAS MANY SETTINGS AND THEY ARE ALL TURNED OFF. I CAN IMAGINE HOW MUCH THUMP I WILL GET IF I TURNED THEM ON. TRUST ME THIS AMP DOES THE JOB! IF YOU WANT BASS FOR LITTLE MONEY I SUGGEST YOU START WITH THIS AMP. I PAID $272 HERE ON AMAZON FOR 2 SUBS, AMP AND PORTED BOX!

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Audiobahn 210-Watt 2-Channel Amplifier (A2301T) Review

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(More customer reviews)Product was great - at first. Then it died - spewing smoke and all! But things happen. So I contacted Audiobahn - and that is when it all started. They will not honor their own warranty unless you buy from one of their "authorized resellers'. This was buried in the product's manual and not even mentioned on the warranty card that I filled out and returned when this was first purchased. Many emails over a month long period provided no solution. The responses that I received from the "customer service manager" demonstrated that they had no concern for my business. I will go so far as to say that they were curt & rude in their responses. At no time could they come up with a reason for not standing behind their product. I refuse to do business with a manufacturer that has such little concern for their customers. Look elsewhere for a quality product that has a reputable manufacturer standing behind their products!

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Polk Audio PA200.4 4-Channel Bridgeable Power Amplifier Review

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(More customer reviews)I purchased this Polk Audio PA200.4 amplifier as part of an (initially) reasonably priced stereo upgrade for my 2006 Prius. However, when I received and installed the unit, I found that it introduced a noticeable (and extremely annoying) hiss into my system. This noise was present in all of my speakers (especially the tweeters) at any volume even when the amplifier wasn't connected to any inputs. Thinking that it was a problem with the particular unit that I received, I exchanged it for an identical unit and had the same issue. Eventually, I replaced this Polk amp with a nicer (and more expensive) JL Audio XD400/4 amplifier, which provided much cleaner and more powerful output in a smaller package. I understand that these amps are not directly comparable due to their price difference, but my experience has been to avoid the bottom-line amps from any manufacturer. I have been enjoying a more expensive Polk amp in my other car for the last few years, so I don't suggest that Polk amps all have this issue. However, the PA200.4 is certainly a dud in their product line. *Note: I should also mention that the coating on the rails of this Polk amp seems to corrode over time such that a white powdery finish forms at the surface. The first unit that I received had this problem worse than the second, but it was apparent in both. Although this "corrosion powder" looks like it will brush off, it is impossible to remove completely.

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Boss Audio CH350 4-Channel Amplifier, 100 Watts x 4 Channels Review

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(More customer reviews)I purchased this amp to add to my existing factory setup, I'm running it as a second amplifier to power two Aura Bass shakers along with two `left over' speakers I've mounted behind the rear seats to fill out the sound profile. It works great, delivers the power needed and I wired it to use the remote turn on signal from my radio to operate it independently when I want the extra power the bass shakers give as well as the fuller audio of the added speakers.
The instructions were clear and installation was a breeze, I really liked the flexibility of this amp in accepting low (line level) as well as high (powered) inputs.
The only thing I would have liked is the ability to adjust the speaker level volumes remotely but that is not what this amplifier was designed for and those amplifiers are in a different price bracket entirely. Having independent power volume adjustment for the two sets of channels is still wonderful to fill out the sound as you want it. For the price, versatility and features this amplifier has I'd recommend it or another model on this product line depending on the application.



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Crunch Ground Pounder GPV1000.4 500 Maxx Watt Power A/B Class Four Channel Amplifier (Silver) Review

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(More customer reviews)When I first saw this amp it was at my local electronics store with a price tag well over $120 + tax. I checked it throughly that day to see if it's even in the range I was looking for. Turned out to be a pretty solid amp.
I purchased this amp for $85 shipped to my door through amazon. Put it in my whip within a few hours after redoing my wiring. I drive a 97' suburban and this is powering two sets of MB Quart speakers, one being component the other 6 x 9's. I at first thought that the light on the amp would increase its temperature but it doesn't. I drilled it into some MDF boards just to keep it off the carpet to be safe.
Once the wiring was done sweet sweet heaven started to pump out of every speaker it was powering. Adjusted the settings a little and now I have crisp rich highs/mids running through my Quarts. I recommend buying two sets of RCA Y-splitters (female to 2xmales) if your after market deck has only one set of output RCA's to power your fronts. That way you can drop it down to 4 channels at 125w each. Or you can leave it bridged what ever works best for you.
Over all I am very pleased with this amp and Crunch has earned a spot on my team with audio electronics.

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Polk Audio PA500 4 4-Channel Bridgeable Power Amplifier Review

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(More customer reviews)Love these amps.I was using Sony before but not any more.These amplifiers are clean sounding,well built and are capable of many applications.

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Crunch Ground Pounder GPV700.2 700 Maxx Watt Power A/B Class Two Channel Amplifier (Silver) Review

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(More customer reviews)it is a great product. it works for decent subs. if you want to power high wattage subs then you prolly need to get something else. i have it powering two 250 watt rms kenwoods and it works just fine.

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Pioneer GM-6400F 600-Watt, 4-Channel Power Amplifier Review

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(More customer reviews)Like the other guys said - it is big, it is heavy. Big and heavy suggests big heatsink, which you want. I haven't opened it up to see how well built it is inside, but the bottom cover is made of that cheap, thin, plated steel that they make generic PC cases out of. In contrast, my 350W Rockford Fosgate sub amp is all cast aluminum and chrome-plated, thick steel. The Pioneer runs a bit hotter than the Rockford amp and the screw terminals are much cheaper than the enclosed terminals of the Rockford, but you gets what you pay for.
I have this amp mounted vertically on stand-offs on the side of my trunk space, with a 120mm PC fan blowing across it. Only gets warm then, even when you start off with the trunk interior at 100°F.
I'm playing a 4-year old Pioneer head unit via the RCA jacks into this amp which drives a pair of [...] 6x8 Pioneer 3-way front speakers and some [...] 6x8 Infinity 2-way speakers in the rear. Sounds nice and clear - no noticeable distortion at a fairly high volume level (that I can't stand to listen to for more than a few minutes at a time). With only the head unit (rated at 4x50W, which is supposedly 4x25W RMS) powering the same speakers, I had to use its built-in HPF to take away the bass below 50Hz, else it would be distortion-a-plenty. Now with this amp hooked up, I can feel the front doors vibrating again and no distortion!
Do yourself a favor - ignore the fairy-tale power rating on your head unit and use a separate 4-channel amp for your main speakers. It just sounds so much clearer and you can enjoy the full amount of bass that your speakers can produce. You don't have to listen at a very loud volume to hear the difference. This is the first time I've bothered getting an amp for the main speakers in a car (and I've been driving since 1988). I've upgraded head units and added small subs, but this has made the most overall difference in sound quality. Next time I change cars, a 4-channel amp is the first thing I'm going to install. Wish I'd figured this out years ago!

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The 4-channel GM-6400F delivers a whopping 600 watts max (60 watts x 4 or 150 watts x 2 at 4 ohms; 75 watts x 4 at 2 ohms)--plenty of juice to power your high-quality speakers. It's also got built-in 4-channel crossovers. Speaker level inputs for easy connection to an OEM headunit. Oversized power terminals. And a wide input level of 400mV to 6.5V.

GM-6400F Specs


Pioneer Car Audio SystemsPioneer's Mobile Business Group is known for offering the kind of in-car products that make driving more enjoyable by offering high quality audio and video, seamless connectivity and ease-of-use. Its focus is on the development of new digital technologies including audio video, navigation and satellite radio, while maintaining its strong heritage in products for car audio enthusiasts and sound competitors.
What's in the Box Pioneer GM-6400F Amplifier, Input Harness, Installation Hardware, Owner's Manual

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