Correct load impedence

SharpyWarpy · 9th May 2007, 02:44 PM

I'm a newbie so please bear with me here.
I have a Sony surround sound amp. I wanted to improve the quality of sound when listening to music so I built a set of speakers. I have two drivers per enclosure wired in parallel, they are 4 ohm drivers. It occurred to me this makes the load impedance 2 ohms. Should I put a 2 ohm resistor in there to bring the load back up to 4 ohms? Would it be better to wire the drivers in series, or would that not work properly? Thanks.

Cal Weldon · 9th May 2007, 02:53 PM

Hi,

Are these full range units?

SharpyWarpy · 11th May 2007, 07:31 AM

I''m sorry, I don't know what you mean by "full range". Where can I find terminology of speakers? Thanks.

SharpyWarpy · 11th May 2007, 07:31 AM

Okay, never mind, a quick Google search tells me "full range" means the drivers are capable of producing the entire audio range, which in my are case they are.

Cal Weldon · 11th May 2007, 03:47 PM

I would try running them in series.

Hartono · 11th May 2007, 04:32 PM

given the choice of serial connection or parallel+resistor connection :

1. If you do connect in parallel+2 ohm resistor, your resistor will dissipate a lot of power and should be rated accordingly (watts) ,plus you will lose 50% or more power in that resistor. without the resistor the load will be to hard for amp to drive. meaning not good for amplifier life.

2. I agree with Cal Weldon, I also recommend series connection.

SharpyWarpy · 12th May 2007, 12:39 PM

Quote:

Originally posted by Cal Weldon
I would try running them in series.

Quote:

Originally posted by Hartono
given the choice of serial connection or parallel+resistor connection :

1. If you do connect in parallel+2 ohm resistor, your resistor will dissipate a lot of power and should be rated accordingly (watts) ,plus you will lose 50% or more power in that resistor. without the resistor the load will be to hard for amp to drive. meaning not good for amplifier life.

2. I agree with Cal Weldon, I also recommend series connection.

Thanks for the replies.
I rewired them from parallel to series and they sound just as good. Now I will worry a lot less about my amp. Thanks again guys.

Cal Weldon · 12th May 2007, 03:53 PM

Did you happen to notice if you lost a wee bit at the top end?

Hartono · 12th May 2007, 04:03 PM

I never thought of that before (haven't been putting tweeter in series)

how does that happen ? (losing the top end a bit)

Cal Weldon · 12th May 2007, 04:10 PM

I was just thinking the extra inductance of two voice coils might filter it.

9th May 2007, 02:44 PM	#1
SharpyWarpy diyAudio Member Join Date: Dec 2006 Location: Florida, USA	Correct load impedence I'm a newbie so please bear with me here. I have a Sony surround sound amp. I wanted to improve the quality of sound when listening to music so I built a set of speakers. I have two drivers per enclosure wired in parallel, they are 4 ohm drivers. It occurred to me this makes the load impedance 2 ohms. Should I put a 2 ohm resistor in there to bring the load back up to 4 ohms? Would it be better to wire the drivers in series, or would that not work properly? Thanks.

9th May 2007, 02:53 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Hi, Are these full range units? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

11th May 2007, 03:47 PM	#5
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I would try running them in series. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

12th May 2007, 03:53 PM	#8
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Did you happen to notice if you lost a wee bit at the top end? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

12th May 2007, 04:10 PM	#10
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I was just thinking the extra inductance of two voice coils might filter it. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting


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11th May 2007, 07:31 AM	#3
SharpyWarpy diyAudio Member Join Date: Dec 2006 Location: Florida, USA	I''m sorry, I don't know what you mean by "full range". Where can I find terminology of speakers? Thanks.

11th May 2007, 04:32 PM	#6
Hartono diyAudio Member Join Date: Nov 2002 Location: currently in China	given the choice of serial connection or parallel+resistor connection : 1. If you do connect in parallel+2 ohm resistor, your resistor will dissipate a lot of power and should be rated accordingly (watts) ,plus you will lose 50% or more power in that resistor. without the resistor the load will be to hard for amp to drive. meaning not good for amplifier life. 2. I agree with Cal Weldon, I also recommend series connection.

12th May 2007, 04:03 PM	#9
Hartono diyAudio Member Join Date: Nov 2002 Location: currently in China	I never thought of that before (haven't been putting tweeter in series) how does that happen ? (losing the top end a bit)

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