Hi there:

I would hope you guys can give me a precise and simple explaination on what is a MOSFET amplifier, MONOBLOCK amplifier etc..

I not very familiar with amps so would hope to learn something here.

Googling does not help so far..still noobish

THANKS in ADVANCE!

Monoblock is a term people use for 1 channel amps... which in audio term is called mono... and well it has nothing to do with class D or class T amps actually but since class D amps are largely associate with mono channel amps hence they two are constantly linked together.

MOSFET's real name is metal oxide semiconductor field-effect transistor (known also as MOS-FET, or MOS FET) but i also dunno what they are for.... haahaha....

thanks for the info but still not very clear yet..hehehe

1 channel = monoblock = dedicated for subwoofer use only.
MOSFET: like craziechild said, its more of a term rather than a classification of amplifier.

ei...

y no 1 fills him up wif.. class A amp, class B amp, class AB, class D.. etc etc...

hehehe

Well mosfet is used for being more stable and faster switching power supply than previous amp generation. The mosfet IC is small yet power pack. Look at pioneer use it widely ever since it release it. Monoblock amp best suit for subwoofer as it churn out more watts at low thd level. Thd stands for total harmonic distortion. The lower the rate per channel watt output the higher the amp quality. Take a comparison between soundstream Xstream and Picasso. Picasso give out more cleaner and lower distortion than xstream.

yea..i also wanna know whats with the class?
initially tot it was classification for amps...silly me...haha..

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Added on December 16, 2007, 4:46 pmSo whats the difference between a single channel and 2 channel?
monoblok better ?

This post has been edited by stupidbump: Dec 16 2007, 04:46 PM

bump: look at amps like this... no matter single channel or 2 channel and both are class a/b, share the same power output. then they both are the same. there is nothing such as which is more superior between them...

and as for the question why people say monoblocks are better is because of the wiring manipulations you can perform on the amp. some monoblocks are good until 0.5ohm, some only till 2 ohm stable...

so in the end, what ever number of channel you choose, the wattage is the thing that you should consider. no 1000w rms @ 4ohm monoblock is better than 1000w rms @ 4ohm bridged 2 channel amp... they both are the same provided they are of the same class...

cheers...

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Added on December 16, 2007, 6:55 pmas for the classifications from my short piece of note from my jotter book:

class a- the output is always on no matter if there is music signal to be played, making it very power consuming but the SQ is at top notch. and also the heat is generated faster from this class of amp as the amp pumps out all the power regardless of whether there is music to be played of not.

class b - the output constantly turns on and off which in turn gives a lower idling power consumptions but the SQ goes down. Heat is reduced also as the amp will rest itself when the is no musical signal to be played.

class a/b - combination of the above two class to give a optimum SQ while less heat.

class d(thanks to mycarhifi) - First, lets dispel another myth: Class D does not stand for digital. The input is converted to a two-state (binary) representation of the audio waveform. That is where the similarity ends. This distinction is important because class D does not provide the benefits normally associated with digital components. That being said, class D designs dramatically improve efficiency. Instead of wasting power in the output transistor, the output is switched at a very high frequency between the positive and negative supply rails. If the output is to be zero, then the waveform is at a 50% duty cycle. If the output is to be a positive voltage, then the duty cycle would be greater than 50%. Because the output devices are either completely turned on (no wasted voltage) or completely turned off, theoretically efficiency is 100%. So the audio input must be converted to a pulse width modulated waveform (PWM). The yellow trace below is the output of the amplifier; the blue trace is the PWM waveform. The blue waveform is fed to an output filter, which results in the yellow output waveform. Notice that the output looks somewhat distorted. All of the switching noise and distortion cannot be removed and the result can be seen here. Because of this process of converting the input signal to PWM and converting back to analog, a good deal of distortion is introduced. Conventional feedback like that used in class AB designs is used in these amplifiers to reduce distortion. MOSFETs are the only choice for class D designs. Most class D designs are useful only for bass amps as they can not switch fast enough to reproduce high frequencies. Some high quality, full range class D designs exist for pro audio, but they are complex with multi-phased outputs.


more to come... this is all for now...

ciao

This post has been edited by craziechild: Dec 16 2007, 07:02 PM

THANKS A MILLION for the explaination.
i think i roughly get what you mean already.

HEARTILY APPRECIATE YOUR EFFORT!

thank you craziechild

no problem...

by the way there are class T, class G and etc etc... but i guess those are not very popular still in the market...

ciao

thank you...very very much!!
learned a lot today!!!kekeke

uncle soong's hammer is what class liao?

U want buy ar?

ask onli... hehe

who is uncle soong?noob here...kekeke

he is de powderful ICEr

haha...icic...why so?sorry ah...really very noob in amplifiers one ler...