kicker zx350.4
im installing a pair of fusion tower speakers they are 200 rms each.
here is the specs for the kicker amp im just curious if this amp bridged will push those tower speakers fairly well. eventually ill get a better amp for the tower and use this as a 4 channel amp to push my in boat speakers specs: http://www.sonicelectronix.com/item_...r-ZX350.4.html 60x4 at 4 ohms 90x4 at 2 ohms 175x2 bridged |
I used a cousin of this amp (zx700.5, which is a 350.4 plus a 400.1 grafted together in a single chassis. I ran the amp bridged to a single pair of Bullet Hollowpoints. It worked, but I've since gone to an ARC KS300.2 for not a lot more money, and the difference in headroom and sound quality is amazing.
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wil this amp likely over heat after an hour or so of use? im in texas where it has been constantly 100 outside and running at 2 ohms will be making the amp run hot. any chance it wil over heat and cut on and off? is it better to find an amp i can run 175 watts in 4 ohms so its cooler?
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yes and yes. If you run that amp wfo for an hour in 100 degree heat it'll burn your hand it will be so hot. At least that was my experience.
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so find an amp that i can run around 175-200rms at 4 ohms? suggestions im looking for a used one locally on craigslist so any suggestions that i can look for will help
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Quick soapbox post. Some long time posters have heard it before. :D
I want to try to make a point to discourage the purchase of 4 channel amplifiers solely for the puropse of bridging the 4-channel amplifer to run a stereo load. For many situations, there is a proper stereo amplifer that will deliver the same amount of power while operating at a comfortable 4-ohm load per channel, with the cool, (or cooler) operating temperatures and lower current draw that result from the use of a stereo amplifer. For the OP's question regarding the ZX350.4, I would turn around and recommend a ZX450.2 or ZXM450.2. The reasons are two-fold. First off, MOST 4-ohm speakers are nominally 4-ohms, but in fact, their impedance can be quite a bit lower for certain frequencies. 3.4 - 3.6 ohms is often the norm. This will cause a bridged amp to see less than 4-ohms per side for some frequencies. This in turn shows each amp channel less than 2-ohms; the minimum safe load it was designed to operate into. Secondly Bridging an amp, or running a stereo amp at a nominal 2-ohm load take the amp to its max-current max heat operating condition. If I can draw an analogy, it is kind of like running a car or boat motor right at redline all the time. It is hot, it stresses things, and leads to things breaking soon. Sure you can bridge an amp, but why? Why take it right to the edge of its capabilities? These two things, (lower than 4-ohm speaker impedance and trying to not run an amp right to its ragged edge) are the reasoning for my recommendation MOST OF THE TIME to use a proper higher-powered amplifier that will deliver the spekaers desired rated power at 4-ohms. There are exceptions, so to play both sides, let me quickly explain. :D The Kicker KM6500.2 and KM6500 tower speakers were designed from the beginning to address the first point aove. Specifically, the KM6500.2 is a true 4-ohm system that does NOT dip below 4-ohms. As such, it can be used on a bridged amp, knowing FOR SURE that the amp always sees 4-ohms and only 4-ohms, regardless of frequency. Each amp channel only sees 2-ohms and never less. ... As a result I will recommend the bridging of a 4-channel amp where higher power is needed. Such and example would allow the ZX350.4 to bve used without fear, as the OP asked, or one could go with teh IX500.4, which I currently recommend as the hot ticket for that speaker setup. Back to the topic. For most "nominally" 4-ohm speakers, if you KNOW you are going to be running a pair of stereo speakers, and you need to buy an amp, try to buy a STEREO amp to run them. Use an amp that will deliver rated power to the speakers, while showing the amp a 4-ohm load. The sound will usually be better, the heat will be lower, the current will be less. and the amp will run longer before thermalling. Finally, to clarify or add to what Shawndoggy is saying. Many Class A/B amps run hot. It is their nature. The amp in question as well asa other Kicker amps run hot too, but they have a thermal protection system in them to prevent overheating. If it is hot, but it is running , it is fine. When it starts shutting off is when you know you are too hot, not by being hot itself... You can maximize your cooling for the amp by doing a few things: Always mount it on standoffs so that it is not against carpet. This gets air all arond it and helps shed the heat. Use the recommended wire gage. HIgh current running, (most ot our tower speakers) will create voltage sag, which inturn will increase current flow in the amp. Low voltage actually makes the amp run hotter. Get some air moving. Convection works wonders if you can have some way to allow the air in your amp compartment to change out. Fans will help, but many times, takign the opther steps first will eliminate the need for fans. they are cool to see in an install though, so cinsider it anyway. Hope my soapbox discussio is helpful... :D Thanks Phil Kicker |
I have it running a set of pro80s and haven't had any trouble out of it.
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Justin-
I think Tim puts a little more thought into his crossovers than some, so you may have a setup that works out well for your application with the Pro80's. The crossover, (or the lack of a full crossover for many speakers) is usually the major contributor to a 4-ohm speaker being lessd than 4-ohms. If you have had no problems, you should be golden Phil Kicker |
the km450.2 is only 150rms will that power the 200 rms speakers? or do i need something at 200rms?
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While Kicker does not currently have a stereo amp that big, you can find several of the older Kicker amps on the used market. a ZX550.2 will deliver 205 a side at 4-ohms. A ZX850.2 will deliver 295 a side at 4-ohms. There will be other amps from other brands out there as well with higher power delivery into 4-ohms. My point in my long post above is to try to break that nasty habit of thinking you always have to bridge a 4-channel amp to get the power you need. There is usually a better solution with a two-channel amp. Phil Kicker |
I am running the IX500.4 bridged per Phil's recommendation on a pair of Pro 60's and couldn't be happier! The amp runs a lot cooler than my zx700.5 that is running the rest of the system and the output is phenomenal on the Pro 60's. You can pick up last years IX500.4 for a pretty good price from this authorized kicker dealer: http://www.audiosavings.com/products...10IX500.4.aspx
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buddy of mine has an infinity amp, read some specs on the amp and sounds decent. obviously not the best but its free so i was wondering if it would work? it says 200 watts rms at 4 ohms so it would meet the 200rms each speaker needs. here are the specs:
4 Ohm Stereo: 200W x 2 RMS 4 Ohm Stereo: 400W x 2 MAX 2 Ohm Stereo: 300W x 2 RMS 2 Ohm Stereo: 600W x 2 MAX 4 Ohm BL: 600W x 1 RMS 4 Ohm BL: 1200W x 1 MAX T.H.D. @ 4 Ohms Rated Power: 0.05% Frequency Response(+0 -3db): 20Hz - 20kHz signal-to-Noise Ratio: >95db Channel Seperation: >50db Damping Factor: >200 Simut. Stero/mono: Yes Aux Output: Yes Variable Electric Crossover: Yes Aux Output Variable Electronic Crossover Yes Dynamic Bass Optimizer Circuit: Yes Dimensions (H x W x D): 2-3/16 x 19-1/2 x 8-1/2" 56 x 483 x 203mm Line-Level Sensitivity: 250mv-9v Operating Range:10-16 VDC will this amp work fairly good at pushing those fusion tower speakers? maybe next summer i can buy a better amp but will this work and sound decent for the remaining summer __________________ |
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It might sound funny coming from the Kicker guy telling you not to us the 4-channel Kicker amp, but I would rather steer you right with regards to driving your speakers properly by connecting them to a proper amp for the application. That is the kind of integrity Mr. Irby, Kicker's owner exhibits every day, and I want to try to be the same guy integrity-wise. Maybe I can talk you into a Kicker amp next year! Good luck getting your system hooked up and holler if you have any questions. Phil Kicker |
Phil, I just picked up a pair of used Pro 80's for a great deal and been loking for a good amp that won't break the bank. Would the Kicker IX500.4 that timmyb mentioned be a good fit? I also like the idea of having a class D/H/G amp for the efficiency. I would also like to put the recomended 200 watts to each speaker as well.
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I think you should be golden; I say go for it Phil Kicker |
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