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4 ohm connection for realistic STA-64B

I want to connect 4 ohm speakers to the reciever

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I have a pair of Cerwin Vega 123's as they are 4 Ohm BUT just one pair only as this will have your amp working harder!!!

Posted on Nov 08, 2011

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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.


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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 | Audio Players & Recorders

1 Answer

Trying to connect 4 dual boss 12 to a 5500 boss class d amp


You can only connect an amp which has an output of 8 ohms to speakers that are 8 ohms are greater. You must NOT connect to speakers less than 8 ohms.
If the amp is 4 ohms you can connect speakers of 4 ohms or greater.
If the amp says 4 to 16 ohms then you can't go lower than 4 ohms.
As long as you stick to that rule the choice of speakers is up to you.

Mar 02, 2014 | Numark TTi USB Turntable With BuiltIn...

1 Answer

Not getting full audio signal


You only need one red from the receiver to reach the right speaker and one white from the receiver to reach the left speaker. You say you have both red and white for L and R coming out of the receiver, are you sure? Because all red ouputs are RIGHT and all white are LEFT. I think you have 2 white and 2 red. One of the white is for a front left speaker and one for a rear left speaker. You need to connect to the one for FRONT speakers.

Dec 15, 2013 | Audio Players & Recorders

2 Answers

Service manual for realistic STA-2080


I have a sta-2080 realistic receiver and wide range frequency equalizer plus a tape deck sct-22 all realistic.My problem is when i play the tuner or cd player witch is connected to the aux
the volume goes soft and then loud with a lot of cracking sound now ther is hardly any volume.when i play the tape deck it has it own volume control every thing is good so what parts do i need. thanks corneil

Nov 22, 2010 | Audio Players & Recorders

1 Answer

My denon avr1200 receiver once it is turned on goes into Protection mode. How do you reset or make work?


The reciever will go into protection mode when there is a short in the speaker wires or the amplifier was overloaded. What I would do first is verify that none of the speaker wire connections are loose at the back of the reciever or at each speaker. And verify that none of the wires are making contact with each other. Then label each speaker wire as you remove them from the reciever so you can re-install them correctly. After you have disconnected the speaker wires try unplugging the reciever for 10 to 15 minutes. Most recievers have a self-resetting overload protection switch and this should reset it back to normal. Now try plugging the reciever back in and turn it on without the speaker wires connected. It should be out of protection mode now. If it is still in protection mode verify that there is not a reset switch somewhere on the back of the reciever. If it is not in protection mode now then proceed to connect one speaker set at a time and turn on the reciever to see if it goes into protection mode. If it goes into that mode after connecting a speaker then that speaker is the cause of the problem. If it does not go into the mode after all speakers are connected then try turning the volume up. If it goes into protection mode then there could be an internal short on the amplifier or a incorrect OHM rated speakers connected to reciever. Verify that the speakers are rated the correct OHMS.

Feb 22, 2010 | Denon AVR-1200 Receiver

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How do i connect 4ohm speakers to my 8ohm jvc receiver


You must connect two sets of speakers to do this.
You must connect them in series.
Meaning, you connect the positive of one to the positive (red) on that reciever. Then you connect the negetive of that speaker to the positive of another four ohm speaker, then run the negetive of that speaker to the negetive on the reciever. Just like if you were connecting batteries together.

Remember never to connect multiple speakers in paralell. (positive to positive and negetive to negetive) as this would make four ohm speakers into a two ohm configuration.

You can use speakers with higher ohm ratings in this setup. For instance, if you connect an eight ohm speaker in series with a four ohm this would give you 12 ohms. Which is also acceptable.

Feb 06, 2010 | JVC Audio Players & Recorders

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 | Audio Players & Recorders

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Trying to hook up jbl sr4732 speakers the highs are to loud compaird to the bass or lows. im only using a onkio with a 100 watt per speaker.


These JBL speakers are not made for a home stereo reciever. It could be part of the problem.

I do know that they have a high frequency input and a full range input on each speaker.

I am going to guess that maybe you have them connected to the high frequency input.

Are you using 1/4 inch jacks connecting to the input of the speakers?

I don't remember these speakers having a input for wires.

You may have another issue using these speakers with that reciever.

The JBL speakers are 4 ohms each, it is very likely that the onkyo requires 8 ohm speakers.

Look on the back of the Onkyo where the speaker jacks are at and see if it says anything about the minimum impeadance.

The impeadance is the ohms. Most home recievers are not designed for anything less than 8 ohms. Some are, but most are not.

Using 4 ohm speakers on a system that requires 8 ohm speakers can cause damage to the reciever. Mostly at higher volume levels, it will cause the reciever to overheat and shut off, maybe short out a channel. It pulls 2 times the amount of current thru the output transistors as 8 ohm speakers.

Let me know if this helps you or if you need more help.

Jun 18, 2008 | Audio Players & Recorders

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