anyone know any thing about amps and speakers?

[dave]

Hi i have seen this amp on ebay its got more watts rms then any othere ive seen on there but that all i know about it, is this a good amp will i need anything else to go with it like crossovers what ever they are. i have got a wiring kit from breakers with a 10mm think power cable that has a splitter on it for 4 amps and one of those big fuses.
but i know nothing about ICE. This is for my son. link to amp...
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=4950&item=3046716531

 

[CentoEvo]

Never heard of them.
Being as it 2ohm stable and 1600watts it looks like its designed as a mono amp i.e. to power a sub.
Correct me if i'm wrong anybody

It were proper Bo i tell thee!!​

 

[dave]

Thanks for the reply, but i dont think its mono as under the last pic it says,Musiic Power: 1600w
RMS: 150wx4 (600w)
Im thinking that because it says x4 it means 4 out puts if it was mono wouldn't it only have one. I don't know about all the other stuff like ohm's and thatand mosfet, whats mosfet ive looked at loads of diffrent amps and lots of them say "mosfet"?

don't understand most of that below

MOSFET Amplifier
Integrated adjustable frequency switch (50 - 250 Hz/12 dB)
Adjustable Input level (0.15 to 3 V)
Bass Boost adjustable levels (45 Hz/0 - 12 dB)
HPF/LPF/OFF switch
Large gold plated power connection
Gold plated RCA plugs
2 ohm stable
Overheating protection
Overload protection
Short circuit protection
Lit up control panel
Dimensions: 63*250*320mm

 

[Morty Mort]

Hei.

This amp has actually 150 watts RPM through 4 channels. Or so it says. The questions are: Are the watts measured through 2 or 4 ohms? And are the watts measured through 12 volts (no engine) or 14,x volts (driving).

Read this string:
https://www.fiatforum.com/forum/topic.asp?TOPIC_ID=2714
It explains a great deal.

Anyway, I've never heard of the amplifier. My recommendation will always be Phoenix Gold amplifiers.

Morten.

Be patient. I'm an architect - not a mechanic.

 

[purplemonday]

On the face of it, the amp definitely looks like it's designed to run a sub purely based on the quoted power rating and the 2 ohm capability however without seeing decent close up piccies of the amp (i.e. ones where you can read the writing above the terminals) it's difficult to say for certain.

What is your son planning to run off the amp? If it's just a case of wanting to run a pair of 6x9's or basic sub then there are plenty of better amps out there for the same sort of money (www.caraudiocentre.com has an Alpine which gives 2x50w or 1x130w for £69.99).

It's only necessary to bring crossovers into the equation when you are hooking up component speakers (i.e. separate tweeters, mid and bass) - the crossover splits out the signal into the various frequency ranges for each speaker which prevents the tweeter getting fried by a generous helping of bass.


________________________________________________
I have a drink problem...only one mouth but two hands!

1.6 Active 5 door in Crystal Green.

 

[dave]

Thanks for the replys. i read that link to the other discusion morten, now i know what mosfet is. i emailed the guy selling the amp and he says its defently 600w rms split four ways 150 watts rms per channel 4 chanels = 600w rms didnt know about engine running 14v or 12v thing, My sons bought two he was wanting to run subs off one and 6x9s off the other i think. When the amps arive I can let you know what it says on it.
I still don't understand this 2ohm 4ohm thing.

 

[Blue Seid Boy]

this may be completly wrong so someone please correct me if it is!

2ohm and 4ohm are the resistance that the speaker offers. if the load on the amp is 2ohm then the amp will find it easier than powering a 4ohm load and so it will have a higher wattage and so with a 4ohm load the amp has to work harder to power it and so the wattage will drop.

or that might be complete ******!

 

[Morty Mort]

Heihei.

Ohm is a rating of electrical resistance. A speaker with a rating of 4 ohms connected to an amp will show 4 ohms resistance to the delivered power of the amp. The higher resistance on the speaker cables, the lower power the amp will produce. If the amp is shown a too low resistance, it will produce more power than the amp can safely handle, and will quickly overheat resulting in automatic shutdown or damage.

Usually (I think) speakers and subs are 4 ohms. So are the amps. But if you connect two 4 ohm subs in parallell, you would achieve 2 ohms resistance load. Lowering the resistance draws more current which gives you more power. This allows you to get dramatic increases in power from relatively small amps. I know my Phoenix Gold amp isn't stable in 2 ohms. If you do the opposite - make a serial connection, the total impedance is 8 ohms.

See page:
http://www.eatel.net/~amptech/elecdisc/spkrmlti.htm
for different connection methods.

I wouldn't worry about it. Never done it. I always run this safe. Amp in 4 ohms. Speakers in 4 ohms.

Just some info I found on the net:

Impedance (what subs are actually rated in) is not exactly the same as resistance (but similar enough for comparison). Resistance is electrical opposition to the flow of direct (constant) current while Impedance is opposition to alternating (changes from positive to negative) current. The Impedance rating of a speaker is its average opposition to current within its intended frequency range.

Morten.

 

[dave]

SO this amp says 2ohms stable, can i asume that that means when engine is not running.
When we are looking for speakers should we be looking for speakers with 2ohms writen on them or will ones with 4ohms be ok.
Will a speaker with this on it be any good "Balanced Aluminum Cone Dual 4 Ohm Voice Coils 2 Ohm or 8 Ohm Operation"
thanks

 

[Morty Mort]

Hei.

This is MY opinion, and may ofcourse be discussed.

This amp is 2 ohms stable. It can handle the high output and the heat when the engine is not running, delivering through 2 ohms.

Go for speakers with an impedance of 4 ohms. The amp has 4 channels, delivering 150 watts each. I think this is plenty of power - especially if these watts are through 4 ohms. Propably two of the channels can be bridged into one mono (sub) channel, I don't know. It's irrelevant anyway when two amps are to be used. Maybe the whole amp is somewhat bridgeable from 4 to 2 channels, delivering 300 watts each. Maybe.

Remember to pull a double set of power cables from the battery. Do not serial connect the amps, twice the amount of current is then tried drawn through the first cable. It may overheat (cable), and deliver weak signal to the amp, distorting the audio output.

About the speaker. Read with caution - I can't verify this. It has 2 voice coils running at 4 ohms. These coils can be connected together, making it draw only 2 ohms from the amp. If you use a pair of these speakers you will actually use all 4 channels of the amp, still running in 4 ohms - which is good.

I would still go for the simple... but the above propably works.

Any good answer? Or just confusing? I got confused myself...

Morten.

 

[dave]

HI yes thanks. this bridging thing if i have 2 red and 2 white outputs or 2+ & 2- do i just join 1 red to one white/one + to one - then just use the 2 remaining outputs?
We have a very thick power cable about 10mm core that conects from batery. this came with a masive fuse and on the other end it a splitter that has the thick cable going in and four outputs with thinner but still quite thick cables coming out, i can remove 2 of these, do you think that will be ok?

 

[Morty Mort]

Hei.

The bridging may be dependent on the amp. You'll se when you get it. It may be a lever/switch, or a special way of connecting the speaker wires. Or, it isn't possible at all.

I think the power cable is big enough, yes. Some will disagree with me probably. I have no experience about this. Make sure you place the fuse near the battery.

Morten.

 

[dave]

Hi thanks again, my sons just said he wants some speakers in front of his car as well ive just seen these will they be ok or will the amp blow them up,

Woofer: 6.5", 15 Oz magnet 1" ASV
Frequency: 35-20 kHz
Spl: 93dB
Impedance: 4 ohms
Tweeter: 1" Neodymium magnet Tweeter
Crossover: 2 ways Crossover 12dB

 

[Morty Mort]

You can blow up any speaker with this amp. Any amp actually. Weak amps ruins both speakers and itself. A powerful amp will destroy the speakers if overdriven - but you'll hear it and turn down the volume. So I say: You can use a very powerful amp on not so powerful speakers. It is better to have a powerful amp than a weak. So it will be ok.

MI.

 

[dave]

Thanks

 

[dave]

HI again i got out bidded on thoes last speakers ive seen these other speakers THESE FEATURE A DISHED POLYPROPYLENE WOOFER CONE AND CO-AXIAL SILVER CONED MID RANGE AND TWEETER. will in need crossovers for these
thanks.

 

[Ham]

MOSFET.
Is Metal Oxide Field Effect Transistor.

or a type of Transistor in laymans terms.
Made by various companies.

There are lots of types for differnt applications.

The more power they deliver the more current required to drive them and the more power they use, they generate a lot of heat and so need large heat sinks to cool them and a free airflow over them or even a fan.


Judgeing by the freq: quoted it looks to be a

Sub woofer.




Fiat Stillo MW. 1.9JTD
Met. Blue. all Electric. Skywindow..SatNav+
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Rear Parking sensor and Puddle Lights.


......Ham............

 

[dave]

<blockquote id="quote"> face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by dave
HI again i got out bidded on thoes last speakers ive seen these other speakers THESE FEATURE A DISHED POLYPROPYLENE WOOFER CONE AND CO-AXIAL SILVER CONED MID RANGE AND TWEETER. will in need crossovers for these
thanks.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

WE bought them anyway my son recons he dont need a crossover because they have something built in is he right, hears what the speakers had writen about them, sorry for the capitals i copied and pasted it.

3 WAY CONCERT LINE SERIES SPEAKERS FROM AUDIO X. THESE FEATURE A DISHED POLYPROPYLENE WOOFER CONE AND CO-AXIAL SILVER CONED MID RANGE AND TWEETER. FREQUENCY RESPONCE IS 68HZ TO 20KHZ, IMPEDENCE IS 4 OHMS AND THE SPL IS 92DB. POWER HANDLING IS AN AWESOME 600W PEAK, 550W CONTINUOUS AND 400W NORMAL. SORRY NO R.M.S FIGURE IS AVAILABLE. THESE ARE WELL MADE WITH HEAVY DUTY 20 OZ MAGNETS. THESE ARE BRAND NEW BOXED AND COME WITH GRILES AND FITTINGS.

Thanks dave.

 

[purplemonday]

You are right about not needing crossovers with those speakers - you only need to use crossovers where you are using component speakers (i.e. separate physical speakers for bass and treble as shown below:

________________________________________________
I have a drink problem...only one mouth but two hands!

1.6 Active 5 door in Crystal Green.

 

[dave]

Thanks