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Old 26th February 2009, 11:32   #91
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Quote:
Originally Posted by noidaboy View Post
The 700.1 is rated as
175w X 2 @4ohm's
325w X 2 @2ohm's
650w X 1 @1ohm

The 1200.1 is rated as
400w X 1@4ohm's
800w X 1@2ohm's
1200w X 1@1ohm
This is what noidaboy had mentioned on another thread.

P.S. why in the 700.1 i see 175*2 and 325*2, is that a typo?
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Old 26th February 2009, 11:39   #92
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Quote:
Originally Posted by abhinav.gupta88 View Post
This is what noidaboy had mentioned on another thread.

P.S. why in the 700.1 i see 175*2 and 325*2, is that a typo?
Its a two channel amplifier the model number is 700.2
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Old 26th February 2009, 15:10   #93
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Quote:
Originally Posted by low_bass_makker View Post
Since yours is a D-Class I would take 75-80 % efficiency.
Quote:
Originally Posted by low_bass_makker View Post
AB class it would be 50 % efficient
Quote:
Originally Posted by Autophile View Post
Just in case you need help with the specs of your amplifier. Waiting for your expert insight on this.
May I jump in?

For Class A, B, and AB amps the efficeincy is determined by the quiescent current (also called bias) flowing through it's transisitors.

Class A amps that are the least efficeint in translating input power (from the power supply) into output power (at the speaker) have an efficieincy of about 50% (a little less in reality)

Class AB amp are about 65% and Class B amps are as high as 75% (theoretical limit is about 78%). Class D amps however do not use the same technology as Class A, AB, B. Class D amps use a switching supply which operates a very high frequency and hence can achieve efficiencies greater than 90% (theoretical limit is 100%).

but this is just the basics. there are other factors (heat sink size / fan cooling, number of stages, and atleast for tube amps the topology long-tailed-pair vs SRPP for example) that can determine the overall efficiency of the amp. Without a rigourous study of the amplifier's schematics and test bech results I would not hazzard a guess leave alone debate an amplifer's exact efficiency. Then again I am NO Guru.
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Old 26th February 2009, 15:24   #94
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Quote:
Originally Posted by Autophile View Post
Its a two channel amplifier the model number is 700.2
Yes that was a typo.Apologies
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Old 26th February 2009, 17:10   #95
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Quote:
Originally Posted by Autophile View Post
Its a two channel amplifier the model number is 700.2
Quote:
Originally Posted by noidaboy View Post
Yes that was a typo.Apologies
I aint getting it.
was 700.2 the typo or the power rating at 2 ohms

If the typo was 700.2 , then how come 650 x 1 @ 1 ohms
and if it was the power rating type then how come 325 x 2 @ 2 ohms

I'm totally confused.

P.S. Whats the price of the 700.1 (/2)
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Old 26th February 2009, 20:39   #96
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leave the hassle. buy another 14001 and sleep a 'chain ki neend'
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Old 26th February 2009, 20:42   #97
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Chain ki neend wont come until i have another one in my car.


Trying my sub at 4 ohms tomorrow most probably and decide accordingly.
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Old 26th February 2009, 22:03   #98
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How much is the cost for JBL 14001 with and without b&w
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Old 26th February 2009, 22:11   #99
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Quote:
Originally Posted by abhinav.gupta88 View Post
I aint getting it.
was 700.2 the typo or the power rating at 2 ohms

If the typo was 700.2 , then how come 650 x 1 @ 1 ohms
and if it was the power rating type then how come 325 x 2 @ 2 ohms

I'm totally confused.

P.S. Whats the price of the 700.1 (/2)
Bhai mere the model is 700.2 (Its a 2 CH amp.)

Rest you can visit the website to get all its spec's

Oh are you preparing for the event by anychance?
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Old 26th February 2009, 22:14   #100
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Quote:
Originally Posted by noidaboy View Post
Bhai mere the model is 700.2 (Its a 2 CH amp.)

Rest you can visit the website to get all its spec's

Oh are you preparing for the event by anychance?
Thanks for the clarification. Will check it out.

As for the event, not yet. Will do it tomorrow most probably.
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Old 27th February 2009, 10:32   #101
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Quote:
Originally Posted by abhinav.gupta88 View Post
If the typo was 700.2 , then how come 650 x 1 @ 1 ohms
and if it was the power rating type then how come 325 x 2 @ 2 ohms
that must mean 650x1 @ 4 ohms. Few amps can drive 1 ohm in bridged mode.
Image Dynamics Q 700.2 - Image Dynamics 2-Channel 700 Watt Amplifier

Last edited by navin : 27th February 2009 at 10:38.
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Old 27th February 2009, 10:40   #102
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Quote:
Originally Posted by abhinav.gupta88 View Post
Rest you can visit the website to get all its spec's
the website I visited did not have the specs of the 700.2 hence I had to quote woofersetc.
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Old 27th February 2009, 11:18   #103
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Thanks for the link navin sir.
I was about to search it soon.
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Old 27th February 2009, 15:14   #104
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Update : Checked the amp by wiring the sub at 4 ohms.

The problem earlier was that my subs need 1000w each ( = 2000wrms) while JBL gives 1500w rms at 2 ohms.
So the subs were underpowered.
Due to this, at high volumes, the amp used to reduce the volume / bass at higher volumes.

Now after getting it checked, JBL gives 1200w rms at 4 ohms(14.4v) to the subs which needs 1000w rms. There is no lowering of volume / bass at full volume too.

Thanks for the suggestion guys, i will buy another JBL 14001.
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Old 27th February 2009, 15:59   #105
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finally you decided congrats !!!
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