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Old 21st December 2005, 14:34   #1
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Default Help: Setting amplifier

Recently is got Blau THA 480 4 ch amp. Sounds great and upto my satisfaction. But i am rather doubtful about some settings. Each amplifier avaliable has a specification that some RMS output at 4 ohms and some RMS output at 2 ohms. My amp spec are 80 x 2 + 240 x 1 at 4 ohms.

Now, how do i come to know that at what ohms the amp is running? It may be a silly question, but i am not clear with it!!!
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Old 21st December 2005, 14:39   #2
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Quote:
Originally Posted by amit_sound
Recently is got Blau THA 480 4 ch amp. Sounds great and upto my satisfaction. But i am rather doubtful about some settings. Each amplifier avaliable has a specification that some RMS output at 4 ohms and some RMS output at 2 ohms. My amp spec are 80 x 2 + 240 x 1 at 4 ohms.

Now, how do i come to know that at what ohms the amp is running? It may be a silly question, but i am not clear with it!!!
Hi.
Welcome.

This is not a silly question at all. To answer this question, you will have to tell us how many speakers you have connected to this amplifier.

For example - if the rear channel has 2 speakers - then it's 4 ohms each. (99% of all car speakers are 4 ohms)
80X2 +240X1 is when you use 2 speakers in stereo mode and one woofer in bridged mode.
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Old 21st December 2005, 14:42   #3
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it all depends on the speaker connections..most speakers these days come with 4 ohms rating..so ur amp ratings are given at 4ohms as standard..whereas certain speakers or rather subs which have Dual Voice Coils can be connected in parallel to get a load of 2ohms..thus ur amplifiers are rated for 2 ohms too to give the user a good idea as to the power being supplied to the speakers..

looks like sam has answered the question before i could in a very simple way..
PS: abey sam,pick up ur phone da..

Last edited by mclaren1885 : 21st December 2005 at 14:45.
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Old 21st December 2005, 15:30   #4
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ya sam, my amp is working as a 3 channel amp. 2 channels are into the rear speaker and one channel into the subwoofer. I have pioneer REV range speakers (yellow ones 330 watts PMPO, and 60RMS @ 4ohms . I know u people dont like PMPO ratings!!!!.) as rear speakers, JBL CS1200T bass tube.
For fronts i have installed sound stream speakers, these are not connected to amp. pioneer 7750 as headunit.
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Old 21st December 2005, 15:48   #5
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It's perfect. Leave it. With your current setup you are making full use of your amplifier. I am assuming that is why you were asking.
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Old 21st December 2005, 23:34   #6
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ya sam, i jus wanted to get some knowledge about the amp settings, but my system rocks, atleast for me. Thanks for all u people for giving me advice, in the topic which i started "advice car audio setup for Hyundai accent"
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Old 22nd December 2005, 18:07   #7
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hi amit sound
amp runs at the ohms of speaker. BTW we call it impedance not ohms
the impedance of a speaker is mentioned on it. it can be 2 ohm 4 ohm or 8 ohm, generally 4 ohm as the other guy said
u can even measure it by using a multimeter
if u connect 2 speakers in parrallel the net impedance is divided by 2 and in series it is mulltiplied by 2.
summary
2 speakers in parallel each 4 ohm makes a load of 2 ohms or u r amp
2 speakers in series each 4 ohm makes a load of 8 ohms or u r amp
u definately get more power @ parallel @ 2ohms

Last edited by amit1101 : 22nd December 2005 at 18:10.
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Old 8th March 2007, 14:17   #8
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1)I have pio Coax(rear) & 1000watt Base tube connected to 4channel Sony Xplod amp
& Front 4" Balupunk connect to HU (is this correct?)
2)Cant i connect the 4" baupunk to amp????
3)in the amp considering my prsent settings
rear Speakers are played at HPF(off) & Woffer LPF(on)(is this correct??)
4)can i get power to 4" balupunk from Amp???
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Old 8th March 2007, 18:20   #9
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Quote:
Originally Posted by amit1101 View Post
hi amit sound
amp runs at the ohms of speaker. BTW we call it impedance not ohms
the impedance of a speaker is mentioned on it. it can be 2 ohm 4 ohm or 8 ohm, generally 4 ohm as the other guy said
u can even measure it by using a multimeter
Since you yourself are particular about not referring to impedance as merely ohms, I thought I should point out that a normal multimeter in resistance mode will display the DC resistance of the speaker and not the impedance. Impedance mentioned on the speaker is the nominal impedance. The nominal impedance and the DC resistance vary significantly.

As for....
Quote:
Originally Posted by amit1101
if u connect 2 speakers in parrallel the net impedance is divided by 2 and in series it is mulltiplied by 2.
... this is true only if both the speakers in consideration have the same impedance.
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Old 8th March 2007, 18:24   #10
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Quote:
Originally Posted by ASH-WINS View Post
1)I have pio Coax(rear) & 1000watt Base tube connected to 4channel Sony Xplod amp
& Front 4" Balupunk connect to HU (is this correct?)
2)Cant i connect the 4" baupunk to amp????
3)in the amp considering my prsent settings
rear Speakers are played at HPF(off) & Woffer LPF(on)(is this correct??)
4)can i get power to 4" balupunk from Amp???
In theory, you could power the fronts from the amp, it would play, but you would have no control over the level of individual pairs of speakers, and both pairs of speakers would receive the same amount of power at any given time.

HPF off? The option must be HPF or Off. Which position is it on? Some Sony amp's have a fixed HPF setting of 80Hz. If you have a sub, you should ideally set the switch to HPF.
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Old 8th March 2007, 18:29   #11
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Quote:
Originally Posted by amit1101 View Post
if u connect 2 speakers in parrallel the net impedance is divided by 2 and in series it is mulltiplied by 2.
summary
2 speakers in parallel each 4 ohm makes a load of 2 ohms or u r amp
2 speakers in series each 4 ohm makes a load of 8 ohms or u r amp
u definately get more power @ parallel @ 2ohms

if the speakers are connected in parllel then the result would be like this

1/r + 1/r + 1/r........ = 1/R

but if the speaker are connected in series then the result would be like....

r + r + r.....= R
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Old 9th March 2007, 09:15   #12
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2)Cant i connect the 4" baupunk to amp????

you can but it is not advisable.

3)in the amp considering my prsent settings
rear Speakers are played at HPF(off) & Woffer LPF(on)(is this correct??)

Since you have a sub, rear speaker can be HPF on.

4)can i get power to 4" balupunk from Amp???

it is preferable to only connect one speaker per channel (unless ofcourse you are bridging 2 channels for a subwoofer).
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