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Old 21st August 2008, 10:19   #8566
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Originally Posted by noidaboy View Post
@ LBM esw12 has 400peak power
Bacha I am asking for the RMS figure I don't need the peak figure.
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Old 21st August 2008, 12:02   #8567
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Originally Posted by greenhorn View Post
what are the RCA cable's you're using now ? are you sure they have enough shielding ?
They are Monster - 1yr old, I don't know if the shielding is enough. The car is NHC.


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Originally Posted by Sam Kapasi View Post
Change your RCA cable and run it away from the power line. This should mostly solve your problem.
Yes, they run together. I'll first try grounding the RCA jacks on the Amp and then on the HU since that's the easiest thing to do. If that doesn't work I'll space the RCA from the Power and change them.

Thanks for the inputs.

By the way, the SQ changed dramatically after I changed the amp from Sony to JBL. I'm no audiophile but even I could tell there was an immense difference: The sound is tighter, less boomy, clearer. The clean-ness encourages me to go louder. To be honest, I didn't expect any change.

However from the above experience and from what I read in the forum, Sony amps have exceptional noise tolerance. Let's give that one credit to Sony.
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Old 21st August 2008, 12:28   #8568
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Originally Posted by ketchup View Post
Sony amps have exceptional noise tolerance.
I wish I was as tolerant of noise as Sony. :-) LOL.
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Old 22nd August 2008, 16:57   #8569
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Default Hi

i have seen you pick, i feel you have connected all the RCA outs together try checking from which RCA out the noise is coming then only short that RCA out to the ground it will work i have tried the same ti will work.

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Originally Posted by ketchup View Post
Hello,

I have a query regarding alternator noise:

I was using a Sony Amp (554zr) with my Pio HU. I changed this amp to a JBL GT5 604. I had severe alternator noise: a "kirrrr" sound from the speakers which goes to a high pitch with accelleration.

I then set the input levels on the Amp near to the min mark (6v), this has eliminated the alternator noise for the front speakers, but there's still some noise from the rears. The downside is that I have to play the volume at close to max on the HU.

I came across this solution on TBHP.

Attachment 40497

This is the back of a HU. My question is: Would it work if I did this on the Amp instead of on the HU? And is it safe ie, wiring 2 or 4 shields together?

Thanks, Giri
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Old 22nd August 2008, 19:16   #8570
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One of the amps that I am considering for my sub puts out 350W at 4 Ohm & 900W at 1 Ohm. Should I wire my DVC sub for 4 Ohm or 1 Ohm? Why?
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Old 23rd August 2008, 10:05   #8571
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Hi,
My friend got a pio p4000dvd from the Us and installed it in his swift. Sadly the video does not work as he says that some cable has to be connected to the hand brake for it to work. A couple of installers over here have no clue how that has to be done. Any help on this will be highly appreciated.
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Old 23rd August 2008, 13:52   #8572
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Originally Posted by nura View Post
Should I wire my DVC sub for 4 Ohm or 1 Ohm? Why?
900W @ 1 ohm. More power.
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Old 23rd August 2008, 14:03   #8573
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Originally Posted by nura View Post
One of the amps that I am considering for my sub puts out 350W at 4 Ohm & 900W at 1 Ohm. Should I wire my DVC sub for 4 Ohm or 1 Ohm? Why?
4ohms!
- better control over subwoofer
- more headroom
- lesser distortion
- better efficiency at 4ohms (if its a class D amp)
- lesser strain on your electricals
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Old 23rd August 2008, 14:13   #8574
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what about the other option, using just one coil with the other coil open/short/loaded with a resistor
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Old 23rd August 2008, 14:24   #8575
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Quote:
Originally Posted by gunbir
- better control over subwoofer
Debatable. Will depend on the amp.

Quote:
Originally Posted by gunbir
- more headroom
Lesser reserve power = lesser headroom

Quote:
- lesser distortion
Nope, closer you get to the max power, greater the distortion. Which is more likely in 4 ohm mode.

Quote:
Originally Posted by gunbir
- better efficiency at 4ohms (if its a class D amp)
Efficiency of class D amp drops drastically with output impedance? Do you have the impedance v/s efficiency curve of any class D amp? I'm sure it does not drop considerably even if it does.

Quote:
Originally Posted by gunbir
- lesser strain on your electricals
If efficiency does not drop, this is irrelevant.
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Old 23rd August 2008, 14:36   #8576
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Originally Posted by Bass&Trouble View Post
Debatable.
Good thing then that I'm not here for a debate. I responded to Nura's post. He can take my advice or leave it, his choice.
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Old 23rd August 2008, 14:39   #8577
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Thanks for the replies. Will the sub play louder at 1 Ohm?
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Old 23rd August 2008, 14:43   #8578
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Originally Posted by gunbir View Post
Good thing then that I'm not here for a debate. I responded to Nura's post. He can take my advice or leave it, his choice.
Now that makes complete sense.
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Old 23rd August 2008, 15:09   #8579
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Quote:
Originally Posted by nura View Post
Thanks for the replies. Will the sub play louder at 1 Ohm?
Wire it first at 4 ohms, listen.. then wire it at 1 ohm and listen..

It will play louder at 1 ohm..

Adjust the gains accordingly and play it at the same reference level, then decide which config appeals to your ears!

Its that simple!!

|
v

Last edited by shrivz : 23rd August 2008 at 15:11.
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Old 23rd August 2008, 18:59   #8580
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Default Query on Pioneer 6988 three way coaxial speakers

Hello to all the gurus,

I am a newbie member on the team . My second day here actually. Have been through most of the threads in this section but couldnt locate anything on the 6988's.


I had been using the 6988 three way coaxial speakers from pioneer along with a HU and coaxial speakers and the bigger tweeters all from Pioneer incidentally with an amp from pioneer too driving the rear 6988's in cars like the Esteem and Sierra. Of late all the cars of mine have come with factory fitted systems so I really havent been aware of the changes that have been taking place.

I had recently begun looking for an audio setup for a SwiftD(thats looking more like a mirage now, thanks to all the delays) , and found that the Pioneer 6988 three way coaxials have been discontinued and are no longer available. I was instead suggested to look at the GTO 937 and also the power series P963 both from JBL.

Now I'm not much of an expert on all things audio, in fact i dont think id qualify as a beginer in the field even. All i know is that the 6988,s in that setup sounded really crisp with sufficent bass and clarity with no distortions whatsover.

Id just like to ask the gurus to suggest a a set of speakers that sound similar to my setup I had earlier in terms of clarity.Im hoping there is somebody in here who has used the Pioneer 6988 three way coaxials so they know what im talking about.



Thanking you for the replies in advance

nicedude
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