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05-19-2010, 04:44 PM
| | | | 8 ohm cab into a 4 ohm head?
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I dont know much about ohms and all that stuff... but i decided to build a mini stack
the bass head- Power: 200 Watts @ 4 Ohms
the cab- Power: 200 Watts @ 8 Ohms
planning on using :
Acoustic 200 H Head
Hartke 210XL Cab
is this safe to do?
Will there be any effects in terms of sound?
Last edited by twangman : 05-19-2010 at 04:47 PM.
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05-19-2010, 04:50 PM
|  | Registered User | | Join Date: Aug 2007 Location: NY,NY | | | Your best bet is to match ohms. It's a good way to avoid fires, lol.
As far as the 200W head into the 200W cab, turning the volume up will have a good chance of blowing out that speaker. Go for something that has more W handling than the head puts out to be safe. 500W capable speakers are not hard to come by.
Seems like you are on a budget too. Check out Carvin. Seriously, pro gear at very competitive prices. |
05-19-2010, 05:32 PM
| | Registered User | | Join Date: Jan 2002 Location: Palm Coast, Florida | | | The 4 ohm rating of your head is a minimum rating - meaning DO NOT GO BELOW 4 OHMS.
An 8 ohm cab is fine with that head, and leaves you room to add another 8 ohm cab.
Your head will probably be putting out around 100-125 watts at 8 ohms.
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05-19-2010, 05:38 PM
| | Registered User
its all about "THE POCKET" | | | | | i have a 200 watt 4ohm cab also and it puts out 120 watts with a single 8 ohm cab so your safe. you will then have the opyion of adding another 8ohm cab later.....just make sure both cabs can do at least 200. |
05-19-2010, 06:23 PM
|  | Player Characters fear me... Moderator | | Join Date: Nov 2002 Location: Middletown CT, USA | | | please, please, pretty please go read the OHMS FAQ in the amps FAQ sticky |
05-19-2010, 06:45 PM
|  | Total Hyper-Elite Member | | Join Date: May 2000 Location: Groom Lake, NV | | Quote:
Originally Posted by CFclef  Your best bet is to match ohms. It's a good way to avoid fires, lol. | Where'd that come from? Running an 8-ohm cab off a head rated at 4 ohms will have absolutely no negative impact, except that the head will not be producing its full power. Unless, of course you drive the cab into distortion, which you can do even with a head and cab rated at the same power.
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05-19-2010, 08:24 PM
| | | Quote:
Originally Posted by Munjibunga Where'd that come from? Running an 8-ohm cab off a head rated at 4 ohms will have absolutely no negative impact, except that the head will not be producing its full power. Unless, of course you drive the cab into distortion, which you can do even with a head and cab rated at the same power. |
how much does it produce if not full power?
half? |
05-19-2010, 08:33 PM
| | Player Characters fear me... Moderator | | Join Date: Nov 2002 Location: Middletown CT, USA | | Quote:
Originally Posted by IvanMike please, please, pretty please go read the OHMS FAQ in the amps FAQ sticky |  |
05-19-2010, 10:06 PM
|  | Registered User | | Join Date: Jul 2004 Location: Fort Collins, Colorado | | Quote:
Originally Posted by IvanMike please, please, pretty please go read the OHMS FAQ in the amps FAQ sticky | ++++++++++++++++++++++++++++++++
Two 8 ohm cabs connected = a 4 ohm load.
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05-19-2010, 10:12 PM
| | Registered User | | Join Date: Oct 2009 Location: Leeds, England | | | I should hope the cab isn't going into the amp. It won't make all that much of a sound otherwise. =P
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05-19-2010, 10:27 PM
|  | keepin' the beat since the 60's | | Join Date: Dec 2007 Location: Studio City, SoCal, USA | | | The amount that the power is reduced into 8 Ohms depends on the design of the amp. It is USUALLY 25-50% less. Don't worry about it - the difference is nearly inaudible. Due to rules of physics and the way the ear works, twice the power is much less than twice as loud.
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Last edited by Bassamatic : 05-19-2010 at 11:07 PM.
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05-19-2010, 10:32 PM
|  | Registered User | | Join Date: Apr 2003 Location: Victoria, BC, Canada. | | | The amplifier can drive a speaker (a load), and the lowest impedance it can drive is usually specified as a minimum near its output terminals. This is your 4 ohms.
You are fine using an 8 ohm load with your amplifier's 4 ohm minimum.
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05-19-2010, 10:35 PM
| | | Quote:
Originally Posted by somegeezer I should hope the cab isn't going into the amp. It won't make all that much of a sound otherwise. =P |
oh man! lol! i just realized that!
mann you got me rolling!!!  |
05-20-2010, 12:29 AM
| | | | I don't mean to highjack the thread but 8+8+4=2 right? thats ohms obviously.
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05-20-2010, 12:41 AM
| | Registered User | | Join Date: Feb 2008 Location: Los Angeles | | Quote:
Originally Posted by strke-fender I don't mean to highjack the thread but 8+8+4=2 right? thats ohms obviously. | You might want to read the TB Ohms FAQ: Ohms FAQ
Total impedance = 1/(1/a + 1/b + 1/c ... + 1/n)
1/(1/8+1/8+1/4) = 2 ohms.
Right answer. |
05-20-2010, 11:02 AM
| | Registered User | | Join Date: Aug 2007 Location: NY,NY | | Quote:
Originally Posted by Munjibunga Where'd that come from? Running an 8-ohm cab off a head rated at 4 ohms will have absolutely no negative impact, except that the head will not be producing its full power. Unless, of course you drive the cab into distortion, which you can do even with a head and cab rated at the same power. | True. I just try to keep things simple to avoid any problems. You are way more experienced than I am with these issues, so I will obviously defer to you... and hold onto that bit of knowledge in case I ever have the same problem as the OP. Thanks. |
05-20-2010, 11:18 AM
| | Registered User | | Join Date: Aug 2008 Location: San Diego, CA | | | Don't we have a sticky on this? | | Thread Tools | Search this Thread | | | | 
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