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Old 8th April 2008, 13:00   #16
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Thanks for the acknowledgment , Ajay.
We now need the great Google Singh ji or Sir Yeti for the exact figure.
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Old 8th April 2008, 13:24   #17
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The GTO1004 is 4 X 100W, each channel at 4 ohms.

It is 4 X 150W, each channel at 2 ohms.

Bridged, it is 280W X2, each channel at 4 ohms.

Baap re, so much you guys can argue, lol. Thanks for the PM Nitrous.
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Old 8th April 2008, 13:39   #18
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Quote:
Originally Posted by Sam Kapasi View Post
The GTO1004 is 4 X 100W, each channel at 4 ohms.

It is 4 X 150W, each channel at 2 ohms.

Bridged, it is 280W X2, each channel at 4 ohms.

Baap re, so much you guys can argue, lol. Thanks for the PM Nitrous.
SAM how do u rate GTO1004 over 75.4. what are the added advantages?
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Old 8th April 2008, 15:07   #19
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SAM how do u rate GTO1004 over 75.4. what are the added advantages?
Me thinks the new extruded aluminum chassis would offer a lot more heat dissipation/cooling than the plexi of the 75.4 , in fact this might have been mentioned earlier by sam yeti kapsi during the discussion.
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Old 29th September 2008, 10:48   #20
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Hey guys, so i need a little help with this.
I have a set of components in the front ( JBL CS2165C) and JL Audio co-ax speakers in the rear door of my SX4.
I need to add an amp, so i gotta choose between the 1004 and the GT5 A604. which one would ur'll suggest and why?
Thanks
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Old 29th September 2008, 11:10   #21
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I need to add an amp, so i gotta choose between the 1004 and the GT5 A604. which one would ur'll suggest and why?
The 1004 is a better amp and will cost more too. If its in your budget, get it.

Why? Like I said, better amp. More power too.
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Old 18th October 2008, 20:14   #22
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Default Gto 1004

Sorry but i am confused here it says that the 1004 puts out
Bridged, it is 280W X2, each channel at 4 ohms.

The Jbl Site says that it is
320W RMS x 2 Channels at 4 Ohms
Here is the link-
JBL Car & Marine Audio

Could the gurus help please.
Thanx in advance.
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Old 24th October 2008, 21:37   #23
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Yep thats what the site says.
Gurus please throw some light.
Sam your required here.
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Old 25th November 2008, 19:31   #24
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Originally Posted by shrivz View Post
It wont be bad, but IMO 225W versus 284W would mean a lot of difference while running a sub. Headroom is at a bare minimum (if any) with the 1004.



Absolutely!!

EDIT: Just noticed, the 1004 is stable at 2ohms!

Any details on the DBO circuit and adjustable 'Q' feature with the mono amps? How do you adjust the Q? is there a frequency selection knob?
Ahhh....questions about Q. Q in an equalizer refers to the width of the filter and the formula for its value is Q=F/BW of (frequency divided by bandwidth. Q in a high pass or low pass filter refers to the shape of the filter above roll-off. Higher Q values have a peak before roll off and low Q values don't. Butterworth filters require a Q of .707.

The DBO circuit in the amplifiers is a high pass (subsonic filter) with a variable frequency control and a variable boost--or Q. It isn't a classical Q control, though. Basically, you can set the bass boost frequency using the Frequency control and dial in the amount of boost at that frequency. THe bass belw the frequency you choose will be attenuated to conserve power for boosting. Remember that a boost of 12dB requires 16x power!
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Old 25th November 2008, 23:12   #25
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Originally Posted by Andy Wehmeyer View Post
Ahhh....questions about Q. Q in an equalizer refers to the width of the filter and the formula for its value is Q=F/BW of (frequency divided by bandwidth. Q in a high pass or low pass filter refers to the shape of the filter above roll-off. Higher Q values have a peak before roll off and low Q values don't. Butterworth filters require a Q of .707.

The DBO circuit in the amplifiers is a high pass (subsonic filter) with a variable frequency control and a variable boost--or Q. It isn't a classical Q control, though. Basically, you can set the bass boost frequency using the Frequency control and dial in the amount of boost at that frequency. THe bass belw the frequency you choose will be attenuated to conserve power for boosting. Remember that a boost of 12dB requires 16x power!
Hello Andy! Welcome to TBHP!

On behalf of everyone here I must say we are pleased to have you here and look forward to your regular contribution to this forum. Enjoy your stay.

Guys, Andy is the Global Product Line Manager for JBL Car Audio and an excellent resource on car audio theory and practice both. We can all learn a lot from him.
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Old 25th November 2008, 23:20   #26
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Originally Posted by Andy Wehmeyer View Post
Ahhh....questions about Q. Q in an equalizer refers to the width of the filter and the formula for its value is Q=F/BW of (frequency divided by bandwidth. Q in a high pass or low pass filter refers to the shape of the filter above roll-off. Higher Q values have a peak before roll off and low Q values don't. Butterworth filters require a Q of .707.

The DBO circuit in the amplifiers is a high pass (subsonic filter) with a variable frequency control and a variable boost--or Q. It isn't a classical Q control, though. Basically, you can set the bass boost frequency using the Frequency control and dial in the amount of boost at that frequency. THe bass belw the frequency you choose will be attenuated to conserve power for boosting. Remember that a boost of 12dB requires 16x power!
Thanks for the reply Andy! this helps a layman like me get a clearer understanding on the DBO circuitry!

As far as filters are concerned, I'm pretty confused on the whole concept. A laymanish explanation on the subject would be highly appreciated! As little as I assume I've understood is that there are three basic types of filters. Bessel, Butterworth and Linkwitz Rylie out of which I guess Linkwitz Rylie is superior and has minimum Q factor at x-over / rolloff point. Please correct me where I'm wrong.

Please bear with my noobish questions as I'm completely new to this subject!

EDIT: Just read gunman's post, "Global Product Line Manager for JBL Car Audio" whoa! My questions must be super noobish for you Andy!

Last edited by shrivz : 25th November 2008 at 23:28.
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Old 29th November 2008, 11:45   #27
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Ahhh....questions about Q.
So, you signed up!! Well, here's someone who can put most audio Gurus to shame, lol.

How about an introduction thread Andy?
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Old 29th November 2008, 13:21   #28
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So, you signed up!! Well, here's someone who can put most audio Gurus to shame, lol.

How about an introduction thread Andy?
OHO, Andy on the forum??? WELCOME
Hope to see you again soon. I heard you had a great time in India.
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Old 30th November 2008, 10:31   #29
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Look who's here! :
A very warm Welcome, Andy!

Your description answering the questions was simply great. Thanks.
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Old 1st December 2008, 21:58   #30
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OHO, Andy on the forum??? WELCOME
Hope to see you again soon.I heard you had a great time in India.
Looks like the next time you'll see him will be in India then
Now to think of an excuse to drag him back here...

Andy won't come back for the audio, but he will come for the food heh heh.
By the way there would have been 3 of us JBL-wallahs on the forum Jenny, only you've quit, lol.

Sir Andrew, bring on the knowledge.
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