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No power to speakers

Subwoofer light does not come on. Everything is connected like it should be. Silver to negative, copper to positive. The power cord is in the socket. The cord coneecting th subwoofer to the main box is connected. I donlt get it.

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Re: no power to speakers

Sounds as if the internal fuse as gone look and replace ?

Posted on Jan 28, 2008

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Subwoofers Power Cable and Speaker Connecting Cables

Nothing special about the original Nakamichi cables. Brochure here:

Nakamichi Soundspace 12

Jul 14, 2016 | Nakamichi SoundSpace 12 System


How to set up a seven-speaker home theater system

Set up a home theater

How to connect your speakers

In order to deliver surround sound, home theater systems require 5, 6, or even 7 speakers--and that's not even counting the subwoofer. Connecting all those speakers together can be quite a challenge, so here's a quick overview of the basics.

If you don't have an all-in-one, home-theater-in-a-box system, you'll probably need to supply your own speaker cables. There are several different types available--they vary in terms of wire size (or gauges) and termination types. Make sure you pick cable that's a good match for your speakers and receiver. And make sure they're long enough; the rear-channel cables in particular will be stretching all the way around the room.

Once you've selected your system and have all your speakers ready to set up, begin by placing each speaker at or near its intended location. Then, attach the cables to them one by one. After securely fastening one end of the cable to the speaker, connect the other end to the appropriate speaker output on the back of the A/V receiver. Be sure to connect the cable to the correctly labeled output.

For instance, the front-right speaker wire needs to go to the terminal labeled front-right. Also, make sure that each speaker connection is in phase, meaning negative to negative and positive to positive. Otherwise, your system's sound will sound out of whack. Repeat the process for every speaker in your system. Note that the subwoofer uses a coaxial-style RCA cable instead of standard speaker wire.

Once all the wires are connected, you should test the system with several DVDs and CDs, to ensure that everything is in working order.

For our first example, we used an elaborate 7.1-channel system, so it may have 1, 2, or several more speakers than your system. Some systems even employ wireless rear speakers, or virtual surround-surround modes that simulate multichannel experience from 3, 2, or even 1 speaker. And some listeners still prefer good old stereo sound from 2 speakers. No matter what type of speaker setup you prefer, however, the wiring basics remain the same.

How to position surround-sound speakers and a subwoofer
To get the best performance from a surround-sound speaker system, you must install each speaker in the correct location. There are three basic types of surround-sound speaker systems.

  • The 5.1-channel system has five satellite speakers and a subwoofer.

  • 6.1-channel systems have six satellites and a subwoofer.

  • And 7.1-channel systems have seven satellites and a subwoofer.

Start by placing the center speaker either directly above or directly below your TV. The center speaker can be perched atop a direct-view TV or mounted on the wall. Aim the center speaker at ear level.

In most cases, the front-left and front-right speakers can be wall mounted or placed on stands. However, if your speakers have rear-panel bass ports, they should not be wall mounted. Space your front-left and front-right speakers the same distance apart as the distance between your center speaker and your listening position. Position the front-left and front-right speakers no more than two feet above or below the front-center speaker. The tweeters in the front-left and front-right speakers should be roughly at ear level relative to your seating position.

Ideally, the surround-left and surround-right speakers should be mounted on the side walls of your room, slightly behind or parallel to your listening position. If your speakers have rear-panel bass ports, place them on stands instead. If installing the speakers on the side walls isn't practical, you can mount them on the room's rear wall or place them on stands behind your listening position. The surround speakers can be installed up to two feet above the front speakers.

Also, 6.1 surround systems have a back-center speaker. You'll typically mount this on the rear wall of your room, centered behind your seating position. Position the back-center speaker no more than six feet behind the surround-left and surround-right speakers. If your speaker has a rear-panel bass port or if the rear wall is too far behind your seating position, place the back center speaker on a stand instead. The back-center speaker should be installed at the same height as the surround-left and surround-right speakers.

Instead of a single back speaker, 7.1 surround systems use a back-left and a back-right speaker. These, too, are typically mounted on the rear wall of your room. Position the back-left and back-right speakers so that each is approximately aligned with the left and right edges of your listening position. Place the back-left and back-right speakers no more than six feet behind the surround-left and surround-right speakers. If your speakers have rear-panel bass ports,or if the rear wall is too far behind your seating position, place the speakers on stands instead. Install the back-left and back-right speakers at the same height as the surround-left and surround-right speakers.

A subwoofer is the last component of a 5, 6, or 7.1 system. Because bass frequencies are nondirectional, you can place the subwoofer in various locations. You may get the best performance by installing the subwoofer in the front of the room, approximately six inches from the wall. If you want more bass, try placing the sub near a corner in the front of the room.

Connect your DVD player to your A/V receiver--digitally
To hear a movie's soundtrack in surround sound, you must first connect your DVD player to an A/V surround-sound receiver. You'll need to make what is called a multi-channel-compatible connection.

The easiest way to do this is to use a cable that carries a digital signal. There are two digital options: optical and coaxial.

An optical digital connection, also called TosLink, uses pulses of light to deliver a digital signal. According to some experts, one advantage of optical digital connections is that optical cables don't pick up noise, while lower-quality coaxial cables can. Many, but not all, DVD players have an optical output. Most A/V receivers have at least one and usually multiple optical inputs. Plug one end of the optical cable into the DVDs player's optical-out jack. Plug the other end into the receiver's optical input.

Finally, you need to tell your receiver to use the optical connection whenever you switch to the DVD input. This is called assigning the input. Information about this simple process can be found in your A/V receiver's manual.

A second option is a coaxial digital connection. This type of connection is also used for cable TV, but the connectors are different. This type of coaxial cable has an RCA connector. Coaxial cables are less expensive than optical ones. In fact, you can use any old RCA cable to make a coaxial digital connection, and you won't lose any audio quality.

Most, but not all, DVD players, have a coaxial output. Some have coaxial and optical outputs, so you get a choice. Audiophiles argue over which connection is better, but it's very hard to hear the difference. Most A/V receivers have at least one and usually multiple coaxial inputs. Plug one end of the coaxial cable into the DVD player's coaxial-out jack. Plug the other end into the receiver's coaxial input.

Finally, tell your receiver to use the coaxial connection whenever you switch to the DVD input. Again, your A/V receiver's manual will have instructions for assigning an input.

on Aug 13, 2010 | Home Theater Systems


How to wire multiple speakers to one channel.

This mainly concerns surround sound systems, with a subwoofer. It is possible to wire multiple speakers to one channel, most useful for subwoofers. Even though bass is nondirectional, the user can still sort of place it. I create "surround bass" with one subwoofer channel. Enough intro.

I purchased two old Sansui LM-110 multi-driver(woofer and tweeter with a passive crossover) and placed them around the back wall till i liked the positioning. I then replaced my ht-z320 subwoofer with a Samsung PS-WX50(from the HT-X50 system). The X50 went in front, under the TV. The wiring to he speakers must be exactly as follows, lest the amplifier in the main unit repeatedly shut the unit down to protect(PROT then shutdown) from damage.

This is easier to do if you know how to solder(it also grants better sound), but can be achieved with a twist on wire connector and wire strippers.

The purple plug positive(denoted as a + inside a circle) keeps its wire, going to front woofer(Samsung PS-WX50) RED. Cut some speaker wire to the back woofer last on the route the wire will take to the rear woofers. Split it, then cut one of the two wires on the speaker wire at the other woofer. strip both ends. Do this to two equal lengths of speaker wire. Split and strip the joined ends of the first wire and connec both ends to the black port on the front woofer, the othe ends to the back woofer RED ports. Take the other wire, join the unsplit ends to the negative wire(helps to cut that short) in the purple plug, using your wire nut. Strip and connect the other ends to the black ports on the back woofers. This basically is a series setup. The back woofers are one one parallel circuit, but are powered as one speaker. therefore, the front speaker and both back speakers(acting as one) are a series loop. To simplify, unit + to front red. Front black to both back red. Both back black to unit -.


on Jun 13, 2010 | Home Theater Systems

1 Answer

I have a Th-C50 home theater and lost my subwoofer system cord, can I use a regular s-cord to make that connection? or is it useless with out the cord?? Please help!


Yes you can use any 2-core cable to carry the bass signal to the subwoofer. As the bass speaker cone is the largest cone in your speaker set I would recommend a good quality cable of decent gauge (thickness) to carry the bass signal.

You just need to make sure you have the right connectors for the amp and sub and make sure you connect positive to positive and negative to negative.

Hope this helps,


Mar 02, 2011 | JVC TH-C50 System

1 Answer

So i just bought the coby dvd938 and i hooked it all up and all the colors are correct and the pocitives and negatives are correct but the only the front 2 speakers and the subwoofer work but i cant get...

Yeah I'm having a similar issue. Front speakers and center speaker working fine but rear speakers are very quiet and the subwoofer isn't working at all. Everything is connected correctly as well if you figure something out let me know.

Dec 06, 2010 | Coby DVD938 Theater System

1 Answer

I whant to plug in a 4 ohm subwoofer instead of the original 2.7 ohm subwoofer

All other things being equal, higher impedance is always safer than less. Give it a try. You may have to reverse the positive and negative leads to get the bass to be in-phase with your other speakers.

May 02, 2010 | Sony DAV-DZ100 System

1 Answer

Just purchased system. Our home was wired for

There is no absolute phasing for a given speaker. It's more important that they all have the same relative phasing.

Assuming the installer was consistent with his phasing of the speaker wires, you decide which one you would like to be red (positive or +) and black (negative or -). Kepp that convention throughout all of your speakers.

Dec 27, 2009 | Home Theater Systems

1 Answer

I bought the LG LHT854 and i dont know how to connectthe speakers because i dont know which ones are the front speakers and rear speakers, all 4 speakers are the same and i dont know how wich is wich..

All four of the small speakers are identical, the original speaker wires are color coded. the very ends are all black and red, corresponding to the black and red connections on the back of the receiver and on the speaker, and there is another color band lower on the wire, which corresponds to the color on the receiver speaker connectors that details front right, front left, rear right, rear left, center, subwoofer.

If you are using standard speaker wire, it has two colors. Pick one for the red, and one for the black.
Just be consistent and connect all speakers the same at both ends (Copper color to plus-red / silver color to minus-black)

Dec 24, 2008 | LG LHT854 Theater System

5 Answers

SP-PWM505 subwoofer does not stay on

Well i had exactly the same problem, my sub turned off right away when i turned the whole thing on. Well i opened the subwoofer and was trying to find out something unusual, i took out, i believe, internal amp, well, whatever that thing is, under the lid. Which one is screwed with 6 copper screws, so you unscrew those screws, lift that lid and that whole board comes out. On that board i find something like burn around one of the parts.

you can see it in the pick, the part q2902, then i contacted JVC. At the beginning they said i need to take the whole thing to service center and so on. But later i made them to tell me what kind of part that is, so here :
bought soldering gun in home depot for $15, returned after i was done. And that is it, just have to replace it, but total cost only $12 ($5 part +$7 shipping)

May 15, 2008 | JVC TH-M505 System

1 Answer

Power issues: will not turn off or function

Unplug all of the speakers and power on.Its possible that one of the speakers is causing the protection circuit to activate.If powered on and subwoofer works start reconnecting one speaker at a time( after powered off) and retest each time.One Speaker may be bad.Its also possible the output ic is failing under a speaker load.There are no fuses related to this issue.If its not a speaker problem then the subwoofer will need to be serviced.

Feb 24, 2008 | Panasonic SC-HT730 System

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