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Depends on the design topology of the amp. While in Class AB, D etc the power drawn is mostly in proportion to the output power, Class A amps will have full draw even when idling.

agree: I forgot the A class here. But then the A class amps are quite rare in the ICE world.

JBL 75.4 and 301.1 are from which class?

Class AB.

I have been trying to figure out my ICE power consumption. Breaking my head with numbers, not finding any solution. Gurus please throw some light. List of things installed in a wagon R Lxi (march 2007 model):
1. JBL CS 60.4 amp (max current draw 40A mentioned on the brochure)
2. Pioneer HU 6950 (max current draw 10A mentioned on the booklet)
3. Pioneer Subwoofer TS-W307D2 (12")
4. Pioneer 4 way rear speakers TS-A6982S
5. JBL 3 way front speakers CS2104

I am searching for answers to the following doubts:
1. How fast can the battery drain happen when ICE is used without engine ON ?
2. How do we compare the power used in watts ? (same like bulbs power consumption)
3. Volume level influences the power consumption ?

I have seen lot of my friends using the ICE (with 4 amps and 2 subs in 1 car etc.) at rest-hours of the trekking, fishing or similar situations without the engine ON. Also heard from many that engine would not start if power is used this way. Its like a confused picture in my mind, hope to hear from gurus. please: . Many of my friends have the similar confusion, so answers are appreciated by a group of people !

The above system - under regular (not very loud) volume will consume about 10A and under. Under louder (boom boom) circumstances it will draw 20A, but rarely more. I quote this from experience.


1. How fast can the battery drain happen when ICE is used without engine ON ? This will depend on the equipment being used and the volume it is being played at.

For example - a simple HU and 4 speakers will run for hours with no noticeable problem with a good battery.
2. How do we compare the power used in watts ? (same like bulbs power consumption) Kind of. ALL power is measured in watts. However in the case of a 40W bulb, switch it ON and it consumes 40W. In the case of your system - the volume you are playing it at, will affect the consumption of power. As you turn the volume up, more current is need. As with any other physical equation - power is the multiplication of the voltage present with the current drawn. More current draw = more power.

3. Volume level influences the power consumption ? Yes.

4 big amps will drain the battery awful fast. Even the idling current of 4 Class AB amps will drain the battery. I would not play such a car system for more than a few minutes (10-15mins) without the engine on. what amps do you friends have?

Hi Sam, it was a great info. The searches online, discussions with friends etc. couldnt clear this doubt since last 10 days. But its bit tough to believe the volume levels affect the power consumption. I never ever thought that way. Hope its the same situation with a 5.1 home theatre system too. I will make sure 'boom..boom' is attained only while the engine is ON. I dont think many regular music lovers are aware of this fact.
Navinji, most of them have combination of JBL CS 300.1, 60.4, 60.2, 75.4 and Pioneer 2 channel and 4 channel amps. Subs are mostly powered by mono amps, front and rear through either two 2-channel amps or a single 4-channel amp. Blasting music while the engine is OFF is a common routine with most of them as a 'show off'. Its not only about my friends, I have seen the same habit with lot of youngsters around the city.

Hello Friends,

I am looking for a good quality audio system. After browsing large number of websites and contacting lots of friends, I have drilled down to following requirements:
Pioneer HeadUnit p6950 or p7950
JBL 937 speakers
JBL 1000 Watt sub-woofer
JBL amplifier - 4 channel.
Front Speakers (I am still doing some R&D on this)

I am reluctant to go to JC road, bangalore as heard about lots of duplication there.....
My budget is around 20-25K but have no idea if I will be able to get this configuration installed in my car....

Can you please help me out in selecting my configuration in this budget...?

I want more of the thump in my car.

Thanx in advance
Harsh

Please pardon posting this here. It is OT but a bit related:

Would the fuel consumption in a car vary depending on the blower speed of the a/c? Shouldn't an increase in blower speed make the compressor work harder?

withstupid

No that doesn't sound right to me. The increase in speed would only increase the current draw of the blower to the battery.

The compressor works on a simple logic. It's either on or off. There is no in-between state.
The duration of the time it is on, versus the duration of the time it is off - is controlled by the temperature setting - the thermostat.
Ergo, it would be logical to say that the fuel consumption of the car will vary depending on the setting of the thermostat.

Since you have posted in the ICE section, I'll take a shot!

By normal logic, the blower should be just a fan that runs on electricity from the battery and hence its speed should have nothing to do with load on the engine. Evidence of this is that the blower can be kept on even when the engine is not running, but not the compressor.

However, in the climate control case, maybe the fan speed is linked to the compressor working also, hence although not directly, the fan speed may influence whether the compressor is always running or intermittently. Not sure about this part though. Must depend on how the climate control is set up to function.

someday one of these kids will desperately need a set of jumper cables.

I beg to differ on the above comments, though these guys above are a lot more qualified. From my experience & logic, I can say that if you have your blower at full speed, more quantity of air inside the cabin is being recirculated which results in the compressor running for a lot longer than if the blower is running in a lower speed. If the air throw is closer to the thermostat, then the thermostat enjoys cooler air & works less, if the throw is wider & longer, then it has to work that much longer to cool the car. I am sure I have sounded crude, but that is my theory, more on this discussion here.

Ergo, it would still be logical to say that the fuel consumption of the car will vary depending on the thermostat.