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#1
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Adding subwoofer, do I need an AMP with MOSFET built in
Presently, I have a Pioneer DEH-7500MP cd player in my pickup.
It supposedly has a mosfet amplifier, 50 watts, I think. I have no idea what does mosfet mean. "MOSFET" doesn't mean anything important. Don't worry if the amp has a MOSFET design or not. Most amps don't even advertise that they have MOSFET output stages, and it's not an inherent advantage anyway. It's a marketing ploy. I am thinking about adding a subwoofer. Do I need to buy a separate amp for it? I am not looking to get car shattering performance, I just want to hear nice distortion free bass at reasonable volume level. Yes, you need an amp. |
#2
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Adding subwoofer, do I need an AMP with MOSFET built in
Subwoofers draw all the wattage. Speakers don't blow from too many watts,
they blow from not enough. A speaker is an acoustic motor which runs on a fuel called "watts". The motor only draws what it needs to put out the musical signal. If there isn't enough you'll have a condition called "clipping", where the entire musical signal cannot be played. When adding a subwoofer, you would be well advised to use a dedicated amplifier in mono mode (4 ohms) of at least 100 watts rms. Almost all Asian made amplifiers have mosfet outputs. They are cheap, always available, and fairly bullet proof. American made amplifiers, (Fosgate, Earthquake, JL, Kicker, etc.) use Bi-polar outputs( not F.E.T.-field effect transistors) which handle more power, cost much more, require novel circuits to eliminate the distortion, but make much more accurate sound. Even if you will only listen at realistic levels, 200 watts would be about right for a single 12" sub in a real enclosure-not generic. P. "Ignoramus13024" wrote in message ... Presently, I have a Pioneer DEH-7500MP cd player in my pickup. It supposedly has a mosfet amplifier, 50 watts, I think. I have no idea what does mosfet mean. I am thinking about adding a subwoofer. Do I need to buy a separate amp for it? I am not looking to get car shattering performance, I just want to hear nice distortion free bass at reasonable volume level. i |
#3
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Adding subwoofer, do I need an AMP with MOSFET built in
Subwoofers draw all the wattage. Speakers don't blow from too many watts,
they blow from not enough. That would defy the laws of physics, so I'm guessing no. A speaker is an acoustic motor which runs on a fuel called "watts". The motor only draws what it needs to put out the musical signal. If there isn't enough you'll have a condition called "clipping", where the entire musical signal cannot be played. Not only is the entire signal played, but more signal to boot (ie. distortion)! When adding a subwoofer, you would be well advised to use a dedicated amplifier in mono mode (4 ohms) of at least 100 watts rms. Doesn't need to be a dedicated amp, and it doesn't necessarily have to be mono. Almost all Asian made amplifiers have mosfet outputs. They are cheap, always available, and fairly bullet proof. American made amplifiers, (Fosgate, Earthquake, JL, Kicker, etc.) use Bi-polar outputs( not F.E.T.-field effect transistors) which handle more power, cost much more, require novel circuits to eliminate the distortion, but make much more accurate sound. No, they don't "make much more accurate sound." Why do you think that? |
#4
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Adding subwoofer, do I need an AMP with MOSFET built in
Peter Klein wrote:
Subwoofers draw all the wattage. Subwoofers - or any load - doesn't "draw wattage". Speakers don't blow from too many watts, they blow from not enough. They teach you that in amp selling class? Speakers blow from too many watts. Thats the only thing other than mechanical failure that will cause a speaker to fail. If you use too small of an amp, you risk causing transient distortin which contain peaks of more power than the amp was designed to put out. This has an equal chance of blowing the amp, but usually the speaker takes a dump first. A speaker is an acoustic motor which runs on a fuel called "watts". You're hurting my brain. You're making everyone in this group stupid with your very presence. Please stop. The motor only draws what it needs to put out the musical signal. The amp puts out the signal. The amp puts out the signal at a given voltage, which is determined by the input voltage. When this voltage is applied across the speakers impedance, a current flows. Voltage * Current = Wattage. If there isn't enough you'll have a condition called "clipping", where the entire musical signal cannot be played. When adding a subwoofer, you would be well advised to use a dedicated amplifier in mono mode (4 ohms) of at least 100 watts rms. Is that because 100 watts RMS is where the amplifier price-points begin to pay you more money? Almost all Asian made amplifiers have mosfet outputs. Damn those squinty eyed asians! They are cheap, always available, and fairly bullet proof. American made amplifiers, (Fosgate, Earthquake, JL, Kicker, etc.) use Bi-polar outputs( not F.E.T.-field effect transistors) which handle more power, cost much more, require novel circuits to eliminate the distortion, but make much more accurate sound. Even if you will only listen at realistic levels, 200 watts would be about right for a single 12" sub in a real enclosure-not generic. P. You are clueless. You are clearly a newb. http://www.teamrocs.com/crap/newbie.htm Please stop giving advice from sales-literature. "Ignoramus13024" wrote in message ... Presently, I have a Pioneer DEH-7500MP cd player in my pickup. It supposedly has a mosfet amplifier, 50 watts, I think. I have no idea what does mosfet mean. "Metal Oxide Semiconductor Field Effect Transistor". It's a type of transistor. I am thinking about adding a subwoofer. Do I need to buy a separate amp for it? I am not looking to get car shattering performance, I just want to hear nice distortion free bass at reasonable volume level. Bass requires as much as 60% (generalization here) of your total system power, even if you're not trying to rock it. You should almost certainly get an amplifier, especially if you don't want distortion (you'll never be distortion free sorry). How much power is up to you - I'm happy with 80 watts RMS of power. Make sure it says "RMS" when comparing watts of one amp to another. -- thelizman teamROCS Car Audio Forums http://www.teamrocs.com/caraudio/ teamROCS Car Audio News http://www.teamrocs.com/news/ "It's about the music, stupid" This post is Copyright (C) 2004. Reproduction of its content anywhere other than usenet without the express written permission of the author is forbidden. |
#5
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Adding subwoofer, do I need an AMP with MOSFET built in
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