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Resistors vs.peltz Autoformer- Differences

I just got an email from Zu.
They offer resistors for their speakers that will lower/raise impedance so that amps will have an easier time driving them.
What is the difference between using a resistor and using an Autoformer, like the Paul Speltz? Both seem to be doing the same thing.
Bob
gdnrbob

Showing 2 responses by timlub

timlub
2,039 posts
 
Resistor.... Q of the woofer and of the system will change.... QES and QTS will raise.  The woofer will want a larger box or want to head towards a sealed box rather than ported.  I've never really like what resistors did to the sound of the bass.... Of course,  it does raise the overall system impedance, but there is no free lunch.  
Be aware that depending on other criteria,  it is possible that you could get a sucked out mid range or a rolled off top end.... But,  its an inexpensive and easy experiment.  
I hope this helps,
Tim
timlub
2,039 posts
 
Parallel connection?  Everything that I said is incorrect. Sorry,  I must have mis read.  From Al's 1st post,  I thought that this was a series connection.  A parallel connection will decrease the load seen by the amp and hurt the amps current capability.  
Good Luck,
Tim 
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