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M1.0t load handling
ibanez59erOffline
#1 Posted: Thursday, February 23, 2012 11:15:05 PM(UTC)
 
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Hi everyone, new member first thread. My speakers (infinity QLS2) have a nominal impedance of 4 ohms. There are two mids,  
 8ohms each connected in parallel to create a 4ohm load. They are dead and I want replace them with some mids I have.
The problem is that these measure 3.6 ohms each, in parallel would give me a 1.8 ohm load. Will my M1.0t have a problem with this??? 
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dennismiller55Offline
#2 Posted: Thursday, February 23, 2012 11:20:28 PM(UTC)
 
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I just wanted to say welcome.  This site has a lot of very active members who are knowledgeable on many subjects.  I am sure someone will chime in soon.   I look forward to your future post.
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madmike46Offline
#3 Posted: Thursday, February 23, 2012 11:26:37 PM(UTC)
 
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Welcome o the forum.  As Dennis said there are some very knowledgable folks here that will chime in.  Looking forward to your future posts.
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TNRabbitOffline
#4 Posted: Thursday, February 23, 2012 11:39:58 PM(UTC)
 
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The short answer is....YES. That would be a hard load for most amplifiers on the planet. Could you not wire them in series?
TNRabbit

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RichP714Offline
#6 Posted: Thursday, February 23, 2012 11:52:00 PM(UTC)
 
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ibanez59er;87349 wrote:
Hi everyone, new member first thread. My speakers (infinity QLS2) have a nominal impedance of 4 ohms. There are two mids,  
 8ohms each connected in parallel to create a 4ohm load. They are dead and I want replace them with some mids I have.
The problem is that these measure 3.6 ohms each, in parallel would give me a 1.8 ohm load. Will my M1.0t have a problem with this??? 


8 ohm speakers usually measure about 6 ohm of resistance (as opposed to impedance). 4 ohm drivers usually measure about 3 ohm resistance.


Are you sure your replacements are 8 ohm drivers? They measure as if they are 4.

Two 4 ohm drivers in parallel would be a hard load, but not impossible for the 1.0.
Enjoy!

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ibanez59erOffline
#5 Posted: Friday, February 24, 2012 12:38:59 AM(UTC)
 
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TNRabbit;87352 wrote:
The short answer is....YES. That would be a hard load for most amplifiers on the planet. Could you not wire them in series?
Does using a series connection decrease output levels??  I am running a 2nd pair of speakers (infinity rs2.5)(simultaneously) which have the same mids and they are in parallel,  which is the original design. If I switched those to series then the tweeters would over power them and so on. Is there a way to make a series/parallel connection using only two drivers??
cwad8505Offline
#7 Posted: Friday, February 24, 2012 12:45:32 AM(UTC)
 
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Don't mean to get off track here.. but a much larger problem is that you would need to completely re-work the crossover if you are changing the drivers.  There are so many issues at play here, not the least of which may be a sensitivity mis-match.  Not trying to rain on your parade, but I want you to be happy with your changes.
Good Luck!
Chris
ibanez59erOffline
#8 Posted: Friday, February 24, 2012 2:56:53 AM(UTC)
 
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cwad8505;87369 wrote:
Don't mean to get off track here.. but a much larger problem is that you would need to completely re-work the crossover if you are changing the drivers.  There are so many issues at play here, not the least of which may be a sensitivity mis-match.  Not trying to rain on your parade, but I want you to be happy with your changes.
Good Luck!
Chris
 
More like a blizzard on my parade. I am a Bricklayer. I have no idea how to mod a crossover, if I could even get it out of the speaker without smashing it to bits. I can see myself with a hammer and chisel already.    I can deal with a slight sensitivity          mis-match, I am just worried about damage.  I own a pair of Infinity rs2.5's which use the exact same divers I am speaking of,    (infinity emims) there are two in parallel (original design) and they rock. Is this where the crossover comes into play. Is there a resistor to lighten the load or something like that, cause, again, it must be under 2ohms.?? I really don't want to go back to colleged'oh! 
schultdwOffline
#9 Posted: Friday, February 24, 2012 3:13:21 AM(UTC)
 
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ibanez59er;87385 wrote:
I really don't want to go back to colleged'oh! 
 
You will have to as the frequency response of the crossover depends on its load. So it isn't just a problem with sensitivity but the frequency band that the drivers see will be different. This will cause the overall speaker response to deviate from the flat response you desire.
 
cwad8505Offline
#10 Posted: Friday, February 24, 2012 3:39:29 AM(UTC)
 
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cwad8505

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Have you checked eBay for some used OEM drivers?  Not sure what the chances would be, but it'd be worth a shot.  You will most likely not be pleased with just swapping those drivers.  I don't claim to know much about the subject, but having built several pairs (15ish) sets of speakers, I have learned that there are many, many factors that go into the design and getting a sound that is tolerable, much less one you'd be happy with.  Sorry for the blizzard, sir... just trying to avoid you heartaches down the road.
Chris
1 user thanked cwad8505 for this useful post.
ibanez59er on 2/24/2012(UTC)
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