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Is It Adviseable To Use Different Brand Subs On One Amp?


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possum1967 
Member - Posts: 2
Member spacespace
Joined: November 07, 2018
Location: California, United States
Posted: August 16, 2021 at 3:01 AM / IP Logged Link to Post Post Reply Quote possum1967
Hello guys and gals of the forum. I recently bought a new mono block amplifier, rated at 1250 watts rms, 1ohm stable. I had it hooked up to 2 12" 4ohm dvc subwoofers, of different brand name. I contacted the company i purchased the amp from, (its less than 3 mos. Old,) and was asked by their tech support if i had used 2 different brands of speakers in my setup. I informed him i did, and that both were of the same impedance, and that i had wired them in series. He said that because i used 2 diff brands, that the imp loads werent the same, and that the amp had received an impedance of lower than the amp could handle. This sounds like nonsense to me, and the guy is really trying to make me look stupid, iam assuming, to avoid honoring the warranty. Am i correct, or is this actually true?
Thanks for any light you can shed my way! Oh. Yes the amp quit, which is why all this took place. Went into protection mode, and wouldnt come out. Never got hot, it just quit.
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cpalmer 
Copper - Posts: 96
Copper spacespace
Joined: March 18, 2007
Location: United States
Posted: August 16, 2021 at 8:00 PM / IP Logged Link to Post Post Reply Quote cpalmer
I might be wrong, but doesn't sound right to me either. I understand that the 2 subs were wired in series to 8ohm then in parallel to the amp , correct? So the amp would have seen a 4 ohm load. Even with some weird mismatching impedance response from sub to sub throughout the frequency range, I don't know how that would have caused an issue. I would love to hear from someone smarter than me to chime in on the theory here that mismatching subs would cause a blown amp.
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: December 24, 2021 at 7:08 AM / IP Logged Link to Post Post Reply Quote haemphyst
Possum... for lack of a better phrase, the guy is full of it. NO AMPLIFIER CARES if there are different speakers connected to it. If that were the case, then a three-way crossover would cause the same issue, right? I mean, they're different drives, with difference impedance curves that overlap at the crossover point, aren't they? As long as the impedance remains in the safe range, preventing the current across the transistors of the output from exceeding the design limits of the device or circuit, then no amp will care. Ever.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

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