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Old 7th October 2005, 08:55   #211
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dude the tweeters on the 426 are not bad. it would make more sense to add more bass upfront that will really bring the music to the front. obviously the midbass will cost more than the tweeter. if you can afford the components go for it. if not let it be.
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Old 7th October 2005, 23:20   #212
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Ok. I will let things be as they are for now. I will fit the parcel tray first and see how things go. Maybe I will be in a better position to think of these things later.
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Old 8th October 2005, 02:16   #213
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Quote:
Originally Posted by navin
vivek, dont worry abot having 2 drivers operating in the 10Hz+ band (both tweeters) if you use option 2 above.

reason: the impedance curve of tweeters tend to rise as the freq.goes up. this is true of most moving coil transducers. by using 2 tweeters the impradance of both in parallel at say 15K will be about 2.8-3 ohms not 2 ohms as you might have feared.
Is it inductive impedance Z = R + wL-1/wC....just remembered something from my engg days..of course all coils are inductances but in general...do speakers (they are moving coil transducers) have inductive impedances...or does it depend on the type of speaker.


Inductive impedances increase as the frequency goes up while capacitive impedances go down... of course there is a "resonance frequency" where wL = 1/wC and you have max power transfer......

Last edited by Buffetfan : 8th October 2005 at 02:20.
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Old 8th October 2005, 10:10   #214
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most moving coil transducers have some inductance. the larger the coil (woofer) the larger the inductance and hence the rise in impedance startes at a lower freq. tweeter inductances are in the order of 0.1mh so the rise starts around 12-15kHz.
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Old 8th October 2005, 19:14   #215
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sorry it is Z = R + j(wL-1/wC) and not Z = R + wL-1/wC....as posted earlier...where j=sq root of -1
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Old 10th October 2005, 09:44   #216
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yes but the relationship is the same (inverse).
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Old 10th October 2005, 11:56   #217
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:(( sam really really jblfyed a santro xing with 2 comp at frnt and 2 dvc subs at the back and ...snif...snifff.... :(( and and...

mclaren u have the pix?
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Old 10th October 2005, 13:31   #218
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Quote:
Originally Posted by jkdas
:(( sam really really jblfyed a santro xing with 2 comp at frnt and 2 dvc subs at the back and ...snif...snifff.... :(( and and...

mclaren u have the pix?
arey yaar all thats nothing just wait for sams surprise...imsure u all will be blown off...
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Old 10th October 2005, 20:00   #219
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Quote:
Originally Posted by navin
1. 97db that is 3db more for the hair parting!
So a sub with 97db is more bhoom bhoom?

which would be better 94db sub ( jbl) or 97 db sub ( hertz).

and hertz sub dont eat space right? coz it works well in small box


Last edited by jkdas : 10th October 2005 at 20:03.
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Old 10th October 2005, 20:02   #220
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Quote:
Originally Posted by jkdas
So a sub with 97db is more bhoom bhoom?

which would be better 94db sub ( jbl) or 97 db sub ( hertz).
The JBL sub is stable at 4 ohms, the Hertz is stable at 8 ohms. So you will need more power to run the Hertz, than JBL. Take that factor in to account as well!
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Old 10th October 2005, 20:07   #221
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Quote:
Originally Posted by aseem
The JBL sub is stable at 4 ohms, the Hertz is stable at 8 ohms. So you will need more power to run the Hertz, than JBL. Take that factor in to account as well!
but coz hertz is more sensitive... i thought it would be better than jbl

and is the hertz ES300D a dual coil one? coz it says a4+4 and hence 8 right?

and hence tough 2 get an amp 2 suit it?

Last edited by jkdas : 10th October 2005 at 20:13.
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Old 10th October 2005, 20:22   #222
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Quote:
Originally Posted by aseem
The JBL sub is stable at 4 ohms, the Hertz is stable at 8 ohms. So you will need more power to run the Hertz, than JBL. Take that factor in to account as well!
Can you please educate me about the "stability" concept of subwoofers. I have only heard this term applied to amplifiers for impedance handling.

The Hertz subwoofers are DVC 4 Ohms that means they can be wired in series for 8 Ohm load or In-parallel for 2 Ohm load.

It will play louder than a 93dB sub with same impedance. Even if compared to a Pioneer SVC 4 Ohms sub rated at 89 dB.

Those who want more loudness wire Hertz subwoofer in parallel to 2 Ohms where it will be much much louder.
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Old 10th October 2005, 20:24   #223
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Quote:
Originally Posted by jkdas
but coz hertz is more sensitive... i thought it would be better than jbl

and is the hertz ES300D a dual coil one? coz it says a4+4 and hence 8 right?

and hence tough 2 get an amp 2 suit it?
JK

FYI 8 ohms is easier load than 4 ohms for an amplifer to handle. But 4+4 does not mean 8 ohms you can wire it in parallel to get 2 ohm load also...if you have a 2 ohm stable amplifier.
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Old 10th October 2005, 20:27   #224
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Quote:
Originally Posted by jkdas
but coz hertz is more sensitive... i thought it would be better than jbl

and is the hertz ES300D a dual coil one? coz it says a4+4 and hence 8 right?

and hence tough 2 get an amp 2 suit it?
well sensitivity just by looking at the figures does not describe how well a speaker or a sub works compared to the other..so that should not be the only consideration while selecting one..
and yes the ES3000 "D" is a DVC and the "D" says its DVC..well there are advantages of both DVC and SVC subs and at the same time disadvantages too..well if u have a good amp then u should have no problem playing a DVC sub conected in parallel,so in the end u will be getting a load of 2 ohms which many amps play quite efficiently if not all..

Last edited by mclaren1885 : 10th October 2005 at 20:28.
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Old 10th October 2005, 20:33   #225
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Quote:
Originally Posted by Autophile
Can you please educate me about the "stability" concept of subwoofers. I have only heard this term applied to amplifiers for impedance handling.

The Hertz subwoofers are DVC 4 Ohms that means they can be wired in series for 8 Ohm load or In-parallel for 2 Ohm load.

It will play louder than a 93dB sub with same impedance. Even if compared to a Pioneer SVC 4 Ohms sub rated at 89 dB.

Those who want more loudness wire Hertz subwoofer in parallel to 2 Ohms where it will be much much louder.
Jasdeep, I in no way want to discourage users from buying your subwoofer. However you know that most 4 channel amps are not stable at 2 ohms. So you will in all likelihood you will wire the Hertz subwoofer in series and the impedance would be 8 ohms.
However the JBL when wired in series will have 4 ohm impedance, so most 4 channels amplifiers would be able to drive it in bridged mode.
So given a 4 channel amp in bridged mode is stable at 4 ohm and above, and JBL running at 4 ohms, and Hertz running at 8 ohm will have twice as much impedance!
Given the fact that Hertz is more sensitive means that it will be louder at same impedance as JBL, however they wont be running at same impedance with a 4 channel amp as stated, thus JBL will be running at half the impefance as hertz and thus sound louder than the Hertz.
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