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#1 |
diyAudio Member
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not sure if this should be in the amp or caraudio section i will move it if it is in the wrong place
can there be any adverse effects to running 36 exactly the same brand new woofers on one class d amp? the impedance was just over the rated 1ohm measured at 1.1 ohm and the input voltage never dropped below 14 volts 9 groups of single 4 ohm wired to 4 ohms and then paralleled to just over 1 ohm total i spoke with the manufacturer of the woofers and he told me about an inductance problem that might/will happen from this 2 of the mosfets completely melted right off of the heatsink all of the woofers were checked and double checked for shorts and phase they all move the same direction im curious now because my line array will get finished soon and i have 36 mids per channel and i dont want to do the same to my amp |
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#2 |
diyAudio Member
Join Date: Feb 2004
Location: Germany
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Inductance will lower with drivers in parallel and increase when they are in series. If you are doing series/parallel or just parallel then no problem. You would get a lot of inductance if you wired a whole bunch in series, but you would also get very high impedance....
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www.forceaudio.com |
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#3 |
diyAudio Member
Join Date: Feb 2002
Location: Western Sydney
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?
4/9= 0.444
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency |
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#4 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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I'm not sure what "9 groups of single 4" means, but I think Pete is on the track with 4/9 giving an impedance very much lower than 1ohm.
Why on earth aim for 1ohm when 4ohm or 8ohm works perfectly well?
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regards Andrew T. |
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#5 |
diyAudio Member
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sorry let me clarify
every 3 are series up to 12 ohms then there are 12 groups of 3 paralleled back down to 1 ohm my mistake i was remembering alot of different wiring configurations and that one stuck in my head fr some reason the reason to use 1 ohm is that is where this amplifier is rated to be used at |
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#6 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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the amp manufacturer is telling fibs.
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regards Andrew T. |
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#7 | |
diyAudio Member
Join Date: Jun 2005
Location: West Vlaanderen
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Quote:
http://www.urbandictionary.com/define.php?term=Fibs Thanks Andrew, I needed that. ![]()
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#8 |
diyAudio Moderator R.I.P.
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A 4ohm driver may only be 3ohm dc
![]() High sensitivity might help on using a classD fore low impedance drive, but you may actually not achieve high sensitivity at all
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sometimes we know very little, and sometimes we know too much |
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#9 | |
diyAudio Member
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Quote:
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#10 |
diyAudio Member
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anyone have any idea what this could do to an amplifier?
is this the same as a line array with a final impedance of (?) can this damage an amplifier |
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Thread | Thread Starter | Forum | Replies | Last Post |
Who might be able to measure inductance? | fazman | Multi-Way | 8 | 21st August 2006 12:26 PM |
Inductance + Subwoofers | rabw | Subwoofers | 17 | 2nd March 2006 08:26 PM |
can I use this cap? what about low inductance? | Wagener | Solid State | 3 | 9th May 2004 10:54 AM |
How to measure inductance? | Jimmy154 | Multi-Way | 41 | 20th July 2003 03:37 AM |
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