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08-20-2011, 01:32 PM
| | Registered User | | Join Date: Jul 2011 Location: East Midlands, UK. | | | Help with head/cab ohms
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Okay so the head is: 4 ohms output power 2x500 rms into 4 ohms, the cab i would like is a 4x10 (8ohms) what would happen if i connected the two?
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08-20-2011, 02:23 PM
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Owner, Bill Fitzmaurice Loudspeaker Design | | Join Date: Sep 2004 Location: New Hampshire | | | |
08-20-2011, 02:42 PM
| | Registered User | | Join Date: Jul 2011 Location: East Midlands, UK. | | | yeah you know a simple answer would be cool, i dont see why i should have to spend ages reading for just a "yes it will be fine" kinda answer.
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08-20-2011, 02:49 PM
|  | Supporting Member | | Join Date: Nov 2008 Location: Lake Havasu City, Az USA | | Quote:
Originally Posted by Ironderby  yeah you know a simple answer would be cool, i dont see why i should have to spend ages reading for just a "yes it will be fine" kinda answer. | Cause BFM thought you wanted to actually KNOW. If SS you'll be fine (just less output power from the amp), if tube maybe not.
Just try it and don't blame anyone here if you don't want to know the why and hows if something goes wrong? 
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08-20-2011, 03:02 PM
| | Registered User | | Join Date: Nov 2005 Location: UK | | Quote:
Originally Posted by Ironderby yeah you know a simple answer would be cool, i dont see why i should have to spend ages reading for just a "yes it will be fine" kinda answer. | And I don't see why anyone else might want to answer a question for someone who can't bothered to help themselves.
As it happens I answered with simple answers to a couple of the many near identical questions you've asked elsewhere. A simple thank you would be nice, but it would be even nicer if you made a little effort so you don't have to keep asking the same question with different combinations of amps/speakers. |
08-20-2011, 03:02 PM
| | Registered User | | Join Date: May 2008 Location: Pittsburgh, PA | | | OP, a simple yes or no is not possible when you don't tell anyone what amp it is right off the bat.
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08-20-2011, 03:16 PM
| | Registered User | | Join Date: Feb 2008 Location: Portland oregon | | | guessing its a hartke lh1000. Its possible to use an 8 ohm cab but it wont be as loud as if you used a 4 ohm cab
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08-20-2011, 03:53 PM
|  | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | | Just don't connect the two outputs into the same cabinet.
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08-20-2011, 03:54 PM
| | Registered User | | Join Date: Jul 2007 Location: Dallas, TX | | | Difference between 2 otherwise identical cabs, one being 4 ohm the other 8, would be hard to measure, it's so little. So much so, it would make no sense to use a 4 ohm cab, that leaves you no room to expand. 2 identical 8 ohm cabs would make a huge difference in the amount of volume produced.
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08-23-2011, 10:09 AM
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Originally Posted by RickenBoogie Difference between 2 otherwise identical cabs, one being 4 ohm the other 8, would be hard to measure, it's so little. So much so, it would make no sense to use a 4 ohm cab, that leaves you no room to expand. 2 identical 8 ohm cabs would make a huge difference in the amount of volume produced. | Naaaw,it makes some kind of difference.... Or otherwise, why gives my Promethean 5110 only 250 Watt to its attached 1x10-cab(8 ohm), and 500watts, if driven with two of them (this means 4 Ohms)? I mean, it's just the half!
The most Solid-State-Amps, suitable to 4 Ohms will not divide the power in two halfs if you run it with a 8-Ohm - cab. You might loose 1/3 of the main power. And: It you are used to push the amp hard, you will notice less volume.
Two examples: Markbass LMII: 300 Watt @ 8 Ohm, 500 Watt @ 4 Ohm
Peavey T-Max: 200 Watt @ 8 Ohm, 350 Watt @ 4 Ohm, 550 Watt @ 2 Ohm.
Remember not to go under the number of what they call "Minimum Impedance" if using more cabs in parallel mode!
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08-23-2011, 12:03 PM
| | | | It just wouldn't be as loud..... I saw a hartke lh1000 mentioned? If that's what it is you can go all the way down to 2 ohms in parallel but you can only run one 4 ohm cab in bridge mono so if your end game is to add more cabinets you can run four 8 ohm cabinets as opposed to two 4 ohm cabinets |
08-23-2011, 12:13 PM
| | Registered User | | Join Date: Jan 2002 Location: Palm Coast, Florida | | Quote:
Originally Posted by TheRealKong Naaaw,it makes some kind of difference.... Or otherwise, why gives my Promethean 5110 only 250 Watt to its attached 1x10-cab(8 ohm), and 500watts, if driven with two of them (this means 4 Ohms)? I mean, it's just the half!
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Not a big difference at all..............
Doubling your wattage only gives an increase of +3db (slightly noticeable, but not "WOW, what a difference")
It takes 10X the wattage to get twice as loud.
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08-23-2011, 12:16 PM
|  | Registered User | | Join Date: Jun 2009 Location: North of Seattle | | Quote:
Originally Posted by Musky And I don't see why anyone else might want to answer a question for someone who can't bothered to help themselves. | +1 Do the work. The knolwedge you gain will allow you to figure out things in the future. How hard is it to read about a subject you're interested in?
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Originally Posted by JimmyM "Do not go gently into that good night; Rage, rage (with 15,000 watts and eight 810 cabs) against the dying of the light!" | |
08-23-2011, 12:40 PM
|  | Average Bassist | | Join Date: Jul 2010 Location: Ontario, Canada | | | Just curious, but what is the head and cab in question? |
08-23-2011, 12:46 PM
| | Registered User | | Join Date: Apr 2006 Location: Northern CA. | | Quote:
Originally Posted by Ironderby Okay so the head is: 4 ohms output power 2x500 rms into 4 ohms, the cab i would like is a 4x10 (8ohms) what would happen if i connected the two? | If solid state amp, it will put out less power to an 8 ohm load. I'm guessing some where around 350 watts. You should be fine. | | Thread Tools | Search this Thread | | | | 
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