Amplifier comparison

navin · 8th August 2007, 09:14

Quote:

Originally Posted by vkhandelwal

any place between mumbai central to santa cruz. Thanks for the help

Bharat Audio at Worli (near the bridge) and Bhavi Motors at Milan Subway good enough?

vkhandelwal · 9th August 2007, 11:19

can someone post the prices of amplifiers options available at Mumbai?

vkhandelwal · 9th August 2007, 11:50

More questions for gurus - I do not plan to add a subwoofer in my car. as informed earlier I have JBL co-AX in rear and COMPO in front. is it good idea to install 4 channel amplifer to drive the front and rear speakers. will this setup improve the sound quality and overall bass from co-ax?

navin · 9th August 2007, 13:09

amplifier options in mumbai:
Sony, Blaupunkt, Pioneer, JBL, Infinity, Audison, Steg, and a dozen or so more.

ramie2400 · 9th August 2007, 13:54

the blaupunkt GTA-4 special is a good option and VFM so do check out with this.

@navin:(Out of Topic) Sir what is the lowest price range for Steg in mumbai??

Cheerz

navin · 9th August 2007, 14:10

Quote:

Originally Posted by vkhandelwal

any place between mumbai central to santa cruz. Thanks for the help

Opera House has a few dealers but dont know any personally. I prefer dealers who have garages large enough to keep my car over night in case the work is not complete in a day.

low_bass_makker · 9th August 2007, 15:48

Quote:

Originally Posted by navin

amplifier options in mumbai:
Sony, Blaupunkt, Pioneer, JBL, Infinity, Audison, Steg, and a dozen or so more.

With Steg and audison on a bit expensive side..

Quote:

Originally Posted by ramie2400

@navin:(Out of Topic) Sir what is the lowest price range for Steg in mumbai??

the entry level Steg that is the Qmos series

for 20k which can do 45 x 2 or 150 x 1 and 25k for 75 x 2 or 250 x 1

filcord · 9th August 2007, 16:18

Quote:

Originally Posted by vkhandelwal

More questions for gurus - I do not plan to add a subwoofer in my car. as informed earlier I have JBL co-AX in rear and COMPO in front. is it good idea to install 4 channel amplifer to drive the front and rear speakers. will this setup improve the sound quality and overall bass from co-ax?

The HU itself puts out about 22 W RMS per channel. This may not be enough to drive the speakers loud, and if you crank up the volume it will certainly distort. Hence you need an amplifier, even if you don't blast the speakers, the sound will be much clearer.

low_bass_makker · 9th August 2007, 16:25

Quote:

Originally Posted by filcord

The HU itself puts out about 22 W RMS per channel..

with 5-10 % noise in it.

navin · 9th August 2007, 23:07

Quote:

Originally Posted by filcord

The HU itself puts out about 22 W RMS per channel.

More like 12W rms at < 0.1% THD 20-20kHz. 222W rms might be at 10% THD 1kHz.

filcord · 10th August 2007, 09:46

Quote:

Originally Posted by navin

More like 12W rms at < 0.1% THD 20-20kHz. 222W rms might be at 10% THD 1kHz.

My Pioneer 4750 user manual says "no more than 5%THD at 22W Rms, 50-15000 Hz"
My question to the Gurus: what levels of Thd are acceptable?

Sam Kapasi · 10th August 2007, 09:52

Good (high end) products are measured at 0.01%THD. Sometimes even less.

THD is not acceptable, it is tolerated while making power measurements. The level of tolerance is specified. In the case of tyour HU, while it is giving out 22W power, the THD is 5% (HIGH!) The pioneer too can be measured while it gives out 0.1% THD (for example, like navin says) but expect it to give out 10-12W rms at this point. No more.

low_bass_makker · 10th August 2007, 10:29

Quote:

Originally Posted by Sam Kapasi

Good (high end) products are measured at 0.01%THD. Sometimes even less.

THD is not acceptable, it is tolerated while making power measurements. The level of tolerance is specified. In the case of tyour HU, while it is giving out 22W power, the THD is 5% (HIGH!) The pioneer too can be measured while it gives out 0.1% THD (for example, like navin says) but expect it to give out 10-12W rms at this point. No more.

If you want to go louder then go for a AMP. Like Jbl 75.4

navin · 10th August 2007, 10:53

Quote:

Originally Posted by filcord

My Pioneer 4750 user manual says "no more than 5%THD at 22W Rms, 50-15000 Hz"
My question to the Gurus: what levels of Thd are acceptable?

and the fact that THD rise at the freq extremes shows why they have loped of almost an octave in the bass and the last 1/3rd octave in the HF.

Sam Kapasi · 10th August 2007, 15:05

Let me simplify what Navin said (Oh nostalgia)

Instead of measuring that at 20Hz - 20Khz (the way it's supposed to be measured), the power has been measured from 50Hz to 15Khz. Because the distortion would be much higher than 5% at those frequencies. So very conveniently, the measurement has been done in the middle band. And that too shows 5% THD lol.

This is a clear example of a marketing con job.

9th August 2007, 11:19	#17
vkhandelwal BHPian Join Date: May 2007 Location: Indore Posts: 71 Thanked: 30 Times	can someone post the prices of amplifiers options available at Mumbai?
	() Thanks

9th August 2007, 11:50	#18
vkhandelwal BHPian Join Date: May 2007 Location: Indore Posts: 71 Thanked: 30 Times	More questions for gurus - I do not plan to add a subwoofer in my car. as informed earlier I have JBL co-AX in rear and COMPO in front. is it good idea to install 4 channel amplifer to drive the front and rear speakers. will this setup improve the sound quality and overall bass from co-ax?
	() Thanks

9th August 2007, 13:09	#19
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,199 Thanked: 9,304 Times	amplifier options in mumbai: Sony, Blaupunkt, Pioneer, JBL, Infinity, Audison, Steg, and a dozen or so more.
	() Thanks

9th August 2007, 13:54	#20
ramie2400 Senior - BHPian Join Date: Nov 2006 Location: Mumbai Posts: 1,903 Thanked: 66 Times View My Garage	the blaupunkt GTA-4 special is a good option and VFM so do check out with this. @navin:(Out of Topic) Sir what is the lowest price range for Steg in mumbai?? Cheerz
	() Thanks

10th August 2007, 09:52	#27
Sam Kapasi Distinguished - BHPian Join Date: Jul 2005 Location: Mumbai (but wat Posts: 6,997 Thanked: 2,378 Times View My Garage	Good (high end) products are measured at 0.01%THD. Sometimes even less. THD is not acceptable, it is tolerated while making power measurements. The level of tolerance is specified. In the case of tyour HU, while it is giving out 22W power, the THD is 5% (HIGH!) The pioneer too can be measured while it gives out 0.1% THD (for example, like navin says) but expect it to give out 10-12W rms at this point. No more. Last edited by Sam Kapasi : 10th August 2007 at 09:56.
	() Thanks

10th August 2007, 15:05	#30
Sam Kapasi Distinguished - BHPian Join Date: Jul 2005 Location: Mumbai (but wat Posts: 6,997 Thanked: 2,378 Times View My Garage	Let me simplify what Navin said (Oh nostalgia) Instead of measuring that at 20Hz - 20Khz (the way it's supposed to be measured), the power has been measured from 50Hz to 15Khz. Because the distortion would be much higher than 5% at those frequencies. So very conveniently, the measurement has been done in the middle band. And that too shows 5% THD lol. This is a clear example of a marketing con job.
	() Thanks