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Old 13th September 2007, 22:51   #31
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Guys guys...chill remember wat this thread was about??

We going a little offtrack..
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Old 14th September 2007, 09:22   #32
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Hi,

Sorry if the this question has been asked eaarlier....

I am getting a little confused on the impedence part, i.e 2 ohm and 4 ohm

Did a little bit of search on the net, from what i understand is that a 2 ohm amp/woofer will allow more current to pass through it than a 4ohm

I lay-man terms kindly explain the following.
Consider the two systems at different impedences

1) A 400 watts RMS DVC woofer run with a 400 Watt RMS amp at 4 OHMS

2) A 750 watts RMS DVC woofer run with a 750 Watt RMS amp at 2OHMS.

(Technical perspective) Now considering the above system, from my basic understading, i say the 2 ohm consumer more power and has more power output.

((SPL) BASS HEAD prespective)Which is louder 2 ohm or 4ohms?
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Old 14th September 2007, 10:05   #33
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OK amit, let me help you.

Imagine a tap with a pipe connected to it. The tap pushes water out through the pipe. As you can imagine, without the pipe the water will flow very well, with no resistance.

But when you connect the pipe, the water flow is a little restricted.

If you have a thick large pipe, the restriction is less. If the pipe is thin, the restriction is more. However, you can control the water better, with a thin pipe.

In the case of copper wound coils, the restriction is called impedance. How much impedance the coil offers the amplifier is more or less decided at the manufacturing stage.

An amplifier that is capable of putting out 100W at 4 ohms will generally offer 150 to 170% more when connected to 2 ohms. (I know what you're thinking, it should be twice as much and sometimes it is too, depending on the quality of the amplifier).
BUT an amplifier running a lower impedance speaker is always under greater stress.

Neither 2 ohms nor 4 ohms translates into SPL directly. However, following the above explanation, a 2ohm woofer will play much louder on the same amplifier, with the same settings. The amplifier would need more current and will get hotter as it will run with a load twice as much.
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Old 14th September 2007, 11:02   #34
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Quote:
Originally Posted by Sam Kapasi View Post
In the case of copper wound coils

An amplifier that is capable of putting out 100W at 4 ohms will generally offer 150 to 170% more when connected to 2 ohms.

Neither 2 ohms nor 4 ohms translates into SPL directly.
additions:
1. some woofers use aluminum voice coils. neither is better than the other it all depends about the total transducer design.
2. most amplifiers are voltage amplifiers. That is they amplifiy voltage for say a 0.5V signal to say a 20V signal. since they are voltage amplifiers as resistance halves current will double. so say the amp is putting out 20V at 4ohms = 5 Amps. P = 20 x 5 = 100W. Now the same amp is putting out 20V at 2ohms = 10 amps P = 20 x 10 = 200W. as long as the amplfier's electronics (transistors, tubes, etc..) can handle the larger current this will happen.
3. The NOMINAL sensitivity of speakers is often quoted at 2.83V. THis voltage was derived becuase most speakers were 8 ohms and 1W/8hms = 2.83V (P = V^2 / R or PxR = V^2). Now a 4 ohms speaker when fed 2.83 volts is actually geting 2W ((2.83*2.83)/4). This means that it's nominal sensitivity will be 3db higher unless the manufacturer specifically states that the ratings were at 1W or 2V (not 2.83V).
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Old 14th September 2007, 11:17   #35
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LOL! Classic Navin explanation! I was looking for it for quite sometime now.

Amit, See layman terms mein:

1. 2 Ohm will play louder than 4 ohms.

2. Woofer generally would be either single coil (SVC) or double coil (DVC), allowing you to extract 4 ohms or 2 ohms from your amp (depending upon amp's capablities).

3. System # 2 in your post would be much louder than in System # 1
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Old 14th September 2007, 11:53   #36
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Hey panky!!!!!!! u the man...sahi simple layman terms

SAM, good to have to back...nice BMC type explanation. Really was easy to understand.

Navin thanks for all that technical information....phew some of it was a bouncer.
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Old 14th September 2007, 11:54   #37
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And my cousine in US has got the ZX2500.1 and S12L5 - 2 ohms bass system
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Old 14th September 2007, 12:03   #38
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congrats amit, please post exact details with prices please, including the buying source.

waise i somehow feel that your cousin would gift this to you in near future. ;-)
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Old 14th September 2007, 12:33   #39
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Quote:
Originally Posted by amit_sound View Post
And my cousine in US has got the ZX2500.1 and S12L5 - 2 ohms bass system
Congrats! he has to wire the subs in series , parallel to get a final 2 Ohm load.



And ask him to go easy on the gain, Kicker amps will always churn out more than rated, so he will be getting around 2700 to 3000 RMS actual out of that amp.
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Old 14th September 2007, 13:05   #40
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Quote:
Originally Posted by panky12345 View Post
congrats amit, please post exact details with prices please, including the buying source.

waise i somehow feel that your cousin would gift this to you in near future. ;-)
hmm...u trying to read the furture OR u trying to solve the trick of this thread.
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Old 14th September 2007, 13:06   #41
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thanks for the info blueraven

Quite helpful indeed
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Old 14th September 2007, 13:31   #42
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Quote:
Originally Posted by amit_sound View Post
hmm...u trying to read the furture OR u trying to solve the trick of this thread.
Both....and I'm pretty sure I'm RIGHT!
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Old 16th September 2007, 02:01   #43
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Hey panky....keep guessing.

Aacha btw cousine said thanks to team-bhp community for helping him with everything. Says he too will become a member.

Now the keeda part in me.

I am,

Planning to settle in for a new zx1500.1 mono amp. (Kicker)
It chruns out 1500x1 rms @ 2 ohms
and 750 x 1 rms @ 4 ohms.

I am throughly confused between the 15" L5 and L7 solo baric woofers.

Note: I am taking about L5 and L7 which run at 2ohms. I am not intrested for the 4 ohm woofer

Official kicker website sugests. (If u need to confirm kicker recommendation....kicker.com -> Support -> Tecnhical Support -> Sub-to-Amp Guide) And a round table sort of opens up

1) Two 15" L7 1000 rms at 2 ohms can be played with a single zx1500.1 amp.

2) Two 15" L5 750 rms at 2 ohms can be played with a single zx1500.1 amp

Now the L7 is rated at 1000 RMS @ 2 ohms and the L5 is rated at 750 rms at 2 ohms.

So u see confused!!


Quote:
Originally Posted by blueraven316 View Post
And ask him to go easy on the gain, Kicker amps will always churn out more than rated, so he will be getting around 2700 to 3000 RMS actual out of that amp.
The zx1500.1 seems a little undepowered fot two L7....but as blueraven suggested that kicker amp outputs a little more than wat they mention on paper. So practicaly making assumptions from blueravens quote, 1500.1 can output aarox 1700 + (appx) at 2 ohms.

Although 1500.1 looks a perfect match for two L5...no doubt about this. But still heart wants more ....So mind say L5 but heart says L7.

Opnions??

Quote:
Originally Posted by blueraven316 View Post
Which Car is This for ?
The two systems are miles apart, Kicker is a pure SPL belter and a pair of L715s will will yank the wax out of his ears (if that is what he wants, then yes its fine) However, that amp will overpower the subs running 2500 RMS @ 2Ohms.
Yes overpowered it looks....but 1500.1 looks a little under powered.

Also,

Something about the boxes....as far as my knowledge is concerned a sealed box is supposed to give tight bass. Where as a ported is not as tight as a sealed but certainely much louder than the sealed enclosure.

Also, it is suggested that if u have enough amplification then a sealed box iis a good match. If amplification is little less then ported should be choice.

So i think that zx1500.1 with 2 L7 in a ported box should perform awesome job..wat say?

BTW i have never heard L5 OR L7 play before. Currently wat i have is two 15" JBL GT4-15 subs and a single GTO601.1 mono amp. I am preety satisfied with the current setup . But still, how much of a difference can i expect by switching from current JBL to two L7s/L5s, hooked with a zx1500.1 in a ported box?


So finally....can i settle in for a 15" L7 with the 1500.1 inside a ported box? (yes/no)

Last edited by amit_sound : 16th September 2007 at 02:06.
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Old 16th September 2007, 03:21   #44
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Quote:
Originally Posted by amit_sound View Post

Something about the boxes....as far as my knowledge is concerned a sealed box is supposed to give tight bass. Where as a ported is not as tight as a sealed but certainely much louder than the sealed enclosure.

Also, it is suggested that if u have enough amplification then a sealed box iis a good match. If amplification is little less then ported should be choice.


BTW i have never heard L5 OR L7 play before. Currently wat i have is two 15" JBL GT4-15 subs and a single GTO601.1 mono amp. I am preety satisfied with the current setup . But still, how much of a difference can i expect by switching from current JBL to two L7s/L5s, hooked with a zx1500.1 in a ported box?


So finally....can i settle in for a 15" L7 with the 1500.1 inside a ported box? (yes/no)
A sealed box can sound tight as long as the volume is kept on the lower side, on a L7, anything above 1.3 CuFt will boom, so if he is looking at tight bass then 1CuFt is more like it.
Compared to the GT4 15" subs in your car it can sound 3 to 4 times louder (LITERLALLY!)

If you want a ZX1500.1 then you have to pair it with a single 15"L7 Dual 2Ohm sub and connect it in series! safer and will beat the cra@ out of the car.
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Old 16th September 2007, 09:50   #45
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Quote:
Originally Posted by blueraven316 View Post
(LITERLALLY!)
If you want a ZX1500.1 then you have to pair it with a single 15"L7 Dual 2Ohm sub and connect it in series! safer and will beat the cra@ out of the car.
Sorry blueraven could not understand this.....U saying to use a zx1500.1 with a single 15" L7 2ohms connected in parallel?

I am looking at two subs....

Also someone please answer my post #43 in detail....too a lot of time out on a SATURDAAY night and wrote it..

Last edited by amit_sound : 16th September 2007 at 09:54.
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