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6 ohm speakers - 8 ohm amp

Just bought speakers that are 6 ohm but my amp only supports 8 or 16 ohm, is this going to give me any problems/damage.

What are the issues??

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Re: 6 ohm speakers - 8 ohm amp

This is a tough one due to the info at hand, but I'll take a stab at it.
I'll assume that your amp is not a tube-type amp. I'll also assume it is a relatively recent "solid state" design. If those assumptions are correct, connecting a 6 ohm load to an 8 ohm amp should not cause significant overheating or amplifier instability.

Posted on Jan 04, 2008

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Y does my technics sug88 say low imp beside the a and b speakers

Because you've done something with the speaker connections that's too low impedance for the amp.

Amps need a certain level of resistance from the speakers otherwise there's a risk of the amp blowing itself up. Impedance is the name for resistance that varies with audio frequency. If the speakers you connected are any good, then there'll be label on the back telling you their impedance in Ohms.

When running a single set of speakers only then the amp would prefer an 8 Ohm load but it will accept a 4 Ohm load. If you plan to run speakers in both the A and B sockets, then both sets of speakers have to be 8 Ohms and no less. It also tells you this on the printing directly above the speaker sockets on the amp.

The amp is trying to protect itself from an overload situation where it would blow its output transistors and possibly kill your speakers too.

Oct 19, 2014 | Amplifiers & Preamps

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How to hook speakers up to a realistic mpa-40

The MPA-40 is a mono public address amp. So it has one speaker output. You select the appropriate socket to suite the speaker type. The 4/8/16 Ohm outs are for various tpyes of Hi-Fi speaker. The 70 Volt is used for muzak in shopping centres, restaurants, and waiting rooms.


If you have a pair of 8 ohm Hi-Fi speakers, you can diasy chain the connections and then use the Com and the 16 Ohm connection.

Daisy chain means you take the wires from a pair of speakers. Connect together the wires going to red on one speaker and black on the other. This now leaves you with two wires going to the other red and black terminals on the speakers, but the ends in your hand are not connected to anything yet. Plug the black in to COM. Plug the red in to 16 Ohm.

The sound from the speakers won't be stereo. It will be mono because that's all the amp outputs. But both speakers will work so long as they're functioning units.

If you have two 4 Ohm home theater speakers then you can do the same trick. 4 + 4 makes an 8 Ohm load. Connect the red to the 8 Ohm output.

Don't be tempted to try to connect to multiple terminals. The amp isn't powerful enough to to run more that one speaker chain.

Hope this helps

Sep 15, 2014 | Amplifiers & Preamps

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Put new pa speakers in church 2 1000 watt tied 2gether and 2 300 watt. tied 2gether. the pa amp only has 250 watts with 6 mics connected and a cd player which plays fine. every time the mics are used if...

You have to check the ohms of the speakers all spekers should be 8 Ohms or above. if not it will overload the amplifier at high level. The minium ohms impedence of the amplifier is 4 ohms. If you connect two 8 ohms speakers together then the effective ohms will be 4 OHMS then the amp will handle the speakers. If you connect two 4 ohms spekers together then the effective ohms will be 2 Ohms, this will overload the amplifier. You will be able to connect two 8 ohms speaker to left channel or right channel of the amplifier. Check the speaker spesifiction to know its ohms. Make sure all the speakers have an impedence of 8 OHMS or above

Aug 19, 2011 | Radio Shack 250 Watt PA Amplifier...

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I am installing a MDS-6a system in my home Must I use all 8 ohm speaker thru up the house ? Can I use 6 ohm ,can I mix ? Thanks

That depends on the amp. If the amp is rated at 6 Ohm's you can, but it's best to stick to the same ohm speakers. If it is rated at 8 Ohm NEVER connect 6 Ohm speakers. The golden rule you can go higher but NEVER lower than the amps rated output. So if it says 6 to 8 ohms on the amp you can use the the 6 ohms speakers.

May 04, 2011 | Channel Plus MDS-6A Amplifier

2 Answers

6 ohn wharfedale speakers on an 8 ohm TEAC amp (both old) - will that work

Yes. Most if not all speakers have impedances which vary with frequency and are rated at a nominal or average impedance. So a manufacturer who rates their speakers at 6 ohms may be more honest or chooses to quote it at a specific frequency. So a nominal 8 ohm speaker may actually measure 4 ohms at 100Hz and 12 ohms at 500Hz but averages somewhere nearer 8 ohms. It is normal for most speaker manufacturers to simplify their ratings so speakers which average at say 6 ohms would be categorised as 8 ohm, and 4.9 ohm averaged speakers as 4 ohms.

As a point of interest - some amplifiers are specified as providing their maximum power at impedances of 6 ohms, and there fore some speaker makers (including those made by same manufacurer as amplifier) will rate their speakers at 6 ohms so they appear more compatible.

Mar 05, 2010 | Amplifiers & Preamps

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I hope you can help:-) I have a Realistic 35 watt solid state P.A. amplifier and on the back of the amp is this: 70V 16 8 4 COM There are holes under them for wires, how do I hook up the speakers to this...

This would depend on if you are using 4,8,16 ohm speakers or a 70v system.

For regular speakers the (-) wire would go to the COM terminal
the (+) would go to either the 4,8 or 16 ohm terminal (Check on the speaker itself for the "impedance").

If more then one speaker is used then there is some other math involved, but i can help with that.

The 70V terminal is used when powering a bunch of celing speakers like in stores and malls. Each speaker has its own transformer on it, all the transformers are connected togeather in a chain and wired to the COM and 70V terminals.

Nov 13, 2009 | Amplifiers & Preamps

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Speaker linking

You know, watts is a heat dissipation unit... It tells nothing about your speaker, the usage you wanna do with it, and what about the amp! Usually on proffessionnal amplifier ( i mean touring power amp) we rely 2 speakers in parallel per side of amp. It turns the amp working at 4 ohms and ifs it pushed by a good amp, and a reasonnable operator, things goes find. If amp ''clip'' it sending DC in the speakers and you actually in the way of a repair. So its now having too much power amp that usually breaks speakers, but too small amp. Check the specifications of what your amp can gives at 20hz to 20khz, both channel driven at 4 ohms. You find out that the amp you believe was sending you 500watts is giving you only 250... Thats why pro series of amp cost so much. Because they are not playing on words but giving power... Cheap series of pro amp counts wattages at 4ohms one channel driven at 1khz at 1% distortions wich is unnaceptable. 0.1% is the max acceptables. Go meet the tech at your local big touring sound contractor and ask for the real thing. You'll get the right answer and analysis of your kit...

Aug 04, 2009 | Behringer EUROPOWER EP2500 Amplifier

2 Answers

Realistic MPA-35 amp by Radio Shack

It's not that this amp isn't like "newer amps" with + and - terminals, it's that this amp is made for public-address system use. This kind of amp is used in a store, for instance, to pump background music through speakers all over the place. The terminals you connect to are determined by total impedance of the speaker configuration used.

Most single speakers, or the two- or three-way cabinets for home stereo systems, are 8 ohms. If you're connecting a single speaker you use the "common" and "8 ohm" terminals on the rear panel. With multiple speakers, you need to figure out the total impedance and use the appropriate terminal. In series, impedances add. Two 8 ohm speakers in series would total 16 ohms, so you use the common and 16 ohm terminals. In parallel, the total impedance drops. Two 8 ohm speakers in parallel total only 4 ohms. You need to figure the total impedance of the speaker configuration and connect accordingly. Too great of a mismatch will damage the amp or speakers or both.

You might be able to find the manual for this amp on Radio Shack's website. Here's a link to the manual for the model MPA-40 which should have similar output terminals. The basic information about figuring out total impedance and general use of PA amps applies to your amp as well.

Jun 16, 2009 | Amplifiers & Preamps

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3 8 ohm speakers 1 stereo amp 2channel a 1 channel b will this do dammage

If you only have 3 (8 Ohm) Speakers and want to hook them all up, you will need to balance the impedance of the sides or you will be too loud on one side and not loud enough on the other. This will cause your amp to work harder on one side. (Not Good)
I did not see the speaker A and B in the instruction manual.

Because of that, I will state the following.
I would not recommend that you hook up anything that is unbalanced. I would use just a pair in two channel mode (This would give you an 8 Ohm load on each output). The manufacture recommends a 4 Ohm load for the best output of this amp. But the most important thing to remember is that your speakers must be able to handle this much power or the speakers will be permanently damaged.
This amp has Protection to cover: Full short circuits, Open Circuits, Thermal and HF protection, and stable into reactive or mismatched loads.

You could hook up all three speakers and the amp will work, but, I would not recommend that type of hook-up.

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I have managed to answer your questions and have helped you, please help me, and rate this suggestion the highest FixYa rating. If you cannot give this post a “FIXYA” (Two Thumbs Up) rating then please comment to this post and I will try to help you further.

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May 23, 2009 | Behringer EUROPOWER EP2500 Amplifier

1 Answer

Which speakers can I use?

You can use any wattage speakers as long as they are not less than the watts from your amp. However you can still use lower wattage speakers as long as you don't turn up the volume full or two loud! Otherwise your damage the speaker.
HOWEVER you must get the ohms matched up right. You must never connect any speaker with a low Ohm to a high rated amp. Or you will blow the output stage transistors or IC.
Most Amps are 8 ohms, so you could connect an 8 or 16 etc, but not a 4 ohm.

Dec 10, 2008 | Amplifiers & Preamps

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