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Speakers using a modified sine wave inverter

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  • Speakers using a modified sine wave inverter

    I was thinking about using an inverter to power both my computer and some Logitech z560 (or z680) speakers. A 400W system for a car is usually really expensive, so I though I could just set up the Logitech speakers and have a nice surround sound system for cheap.
    Is there a problem running speakers off a modified sine wave? Has anyone actually tested it?

    The thought was using a MEGA 160 PC from MSI (barebones PC, nice small case that I could take out of the car for LAN parties possibly?), AMD Barton 2500+, 160GB HD, 512mb, DVD/CDRW, and the Logitechs and hooking all that up to an inverter of 600W, 800W, or possibly 400W if I don't turn the speakers up loud, but I think I'd rather just go with a 600W or higher inverter.

    Any thoughts?

  • #2
    Your speakers are more likely to take DC input themselves, wot you'll be doing is going DC 13.8V - AC 240V - DC 15V (or wotever yr speakers are). Yo might be better off getting a DC-DC converter, those Sin wave invertors are pretty pricey.

    But if yr set on the inverter i cant see a problem, modified sin waves are as close to mains AC you can get.
    Mods: 18" Boss rims,Twin custom stainless exhaust,cold air induction.
    Sound: Pioneer 7400 HU & 6x9's,12" Vibe Sub,600W Kenwood amp.
    CarPC: MicroATX, Inverter, WinTV, Lilliput 7", USB GPS
    http://www.no1knows.com/galleries/

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    • #3
      why are you using computer speakers in your car? Don't you have regular car speakers?

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      • #4
        Originally posted by wyckyd
        why are you using computer speakers in your car? Don't you have regular car speakers?
        Yes, I have stock car speakers. But I would rather have a nice quality set up (the Logitechs are definitely quality). The Logitech z560 setup is 400W for around $100 (ebay). If I tried to get a 400W quality setup of car audio, it would cost me around $500 or possibly more.

        Originally posted by no1knows
        Your speakers are more likely to take DC input themselves, wot you'll be doing is going DC 13.8V - AC 240V - DC 15V (or wotever yr speakers are). Yo might be better off getting a DC-DC converter, those Sin wave invertors are pretty pricey.

        But if yr set on the inverter i cant see a problem, modified sin waves are as close to mains AC you can get.
        These Logitechs are good computer speakers and they plug into an AC outlet in the wall (or the inverter in the car). I don't think I could hook them up to a DC-DC converter. Also, even if I figured out a way to do it, I haven't seen a DC-DC converter that can do even 400W (probably because I haven't searched for one). If there is one that does 400W or greater, I'm sure it would cost me more than a pure sine wave inverter.

        My question is, would it be alright to use these speakers with a modified sine wave inverter instead of a pure sine wave (purely for economical reasons)?

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        • #5
          Frostband, you can get a much better car audio setup for the price your looking at, i doubt a modified sine wave would work too well, even if it did, the speakers your talking about werent designed for automotive applications. Go buy a cheap 4 chan amp and upgrade yr stock speakers, far better option and u could probably do it for under $150.
          Mods: 18" Boss rims,Twin custom stainless exhaust,cold air induction.
          Sound: Pioneer 7400 HU & 6x9's,12" Vibe Sub,600W Kenwood amp.
          CarPC: MicroATX, Inverter, WinTV, Lilliput 7", USB GPS
          http://www.no1knows.com/galleries/

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          • #6
            I seriously doubt you can get a car audio setup that's QUALITY for under $150
            Including 4 speakers and a subwoofer. The Logitechs are high quality and they come with everyone on them, amp, sub, speakers etc...
            A cheap 4 chan amp is NOT quality; it probably produces some noise or artifacts because it is cheap. As for speakers, you can get 4 high quality speakers for $150 not including a sub or amp.
            As I have said, the Logitechs are high quality (rivaling Klipsch and Pioneer) speakers, sub, and amp all for around $100 (and I already have some on my computer that I could test in the car, only if I could find someone with a 200W or higher inverter to test them with).

            I apprecieate your thoughts, no1knows
            But I'm trying to find someone with experience in testing computer speakers with a modified sine wave inverter.

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            • #7
              dear o dear, ok. I'll leave ya to it.
              Mods: 18" Boss rims,Twin custom stainless exhaust,cold air induction.
              Sound: Pioneer 7400 HU & 6x9's,12" Vibe Sub,600W Kenwood amp.
              CarPC: MicroATX, Inverter, WinTV, Lilliput 7", USB GPS
              http://www.no1knows.com/galleries/

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              • #8
                eBay is your friend. I recently purchased 4 100watt COMPONENT speakers for my truck for just $25/piece. They were last years model and are now discontinued, but they sound great.
                Phillip Hullquist

                I entertain people through adventure movies.
                www.11visions.com

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                • #9
                  yea i dont really know how you would mount the computer speakers anyways....


                  i have never heard of anyone doing this before, so u might just have to go out and by an inverter and just test it.... i know u can get 400watt inverters for like $30... (not pure sign wave of course)... so i doubt a higher wattage inverter would cost that much more... (unless u wanted a pure sign wave... [am i spelling that right?])
                  AT mobo
                  Intel Pentium MMX 233mhz
                  ESS Solo PCI soundcard
                  Linksys NIC
                  Irman

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                  • #10
                    i can go test if you'd like but ill just leave it at that it'll work...your speakers's amp probally runs off of 15v DC (easiest way is to look for a huge brick attached to your power cord...thats it :P)
                    (my computer speakers's transformer takes 120v AC @ .6A ...so 72 watts)

                    like everyone else mentioned though.....i still think you would get better sound by upgrading your car speakers. since theres a bit of competition in this area, cheap and good speakers are easy to pick up.

                    but if you dont have the cash then go ahead with this idea...just dont be surprised when your awesome computer speakers dont seem as great in your car.

                    and toadster: its "sine"

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                    • #11
                      You're much better off using automotive audio components. I found a four-channel 400Watt pioneer amp at my Best Buy for $100. That's a great price and the AMP is great. Most amps are pretty similiar when it comes to quality, the biggest differences are in how much power they can output before they start clipping the audio. The pioneer does excellant across the whole range. I also found two pairs of 6.5" 100Watt three-way rockford-fosgates for $60 a pair. That's another great deal. No subs, but I hardly need them. If I want to, I could get a decent sub kit for $160, that includes the subs, enclosure and amp. Yes, you still are paying a little more money, but these components are designed for cars, no extra equipment is required. Also, your audio setup would likely last longer and won't look hacked together.

                      Adding an inverter to the mix, even pure sine wave, is just another chance for noise to enter the system, and one more piece of equipment to maintain. I think you would be much happier with audio equipment designed for a car.

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                      • #12
                        elmo_eats_rust
                        I'll agree with you on some points. I have looked up prices on audio equipment and that's around what I've seen. But all of that adds up (including the sub) to around $380+ (probably not including shipping etc...). If the inverter works, I'm looking at a system that is comparable for $100 + inverter (which is also powering the computer).

                        Adding an inverter to the mix, even pure sine wave, is just another chance for noise to enter the system
                        As for Pure Sine wave inverters, they are generally cleaner power than what you get out of your outlet

                        I know I can set up the speakers in my car to look good. I intended to have the speakers stick out somewhat (in the back of the car) so people know they are logitechs and they'll get jealous

                        Anyway, my real question is: has anyone tested out some quality computer speakers on a modified sine wave inverter? And what did you experience? Was there a lot of noise or not?

                        If someone would test it out for me, that would be great.

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                        • #13
                          i know this isnt what you want to hear (cause i dont have a modified sine wave interter to test speakers on), but you keep reffering to your logitec's as a "quality set up". Lets get one things straight. Logitechs are decent speakers, but not a quality set up for car audio. they are designed for use in a room, with a desktop computer, not a small cabin of a moving car with background noise. So I think what we are all saying is, for the cost of the logitech set up + shipping on ebay + a modified sine inverter your investment would be better spent on something that will more liley work in the car.

                          If you want to find out about it, go buy an inverter and the speakers @ an electronics store and if it works, return the speakers and get them on ebay, if not return the speakers and the inverter.

                          sorry i cant be of more use to ya.

                          EDIT: not that i want to convince you to do this (cause i dont think its a good idea), but a quick froogle search reveals that the speakers can be had for $125 from an online store: http://www.cmishop.com/store/ShowDet...egorySubId=125

                          which gave them a 3.8 out of 5 user rating.....
                          Cheap Laptop, great for Carputer!

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                          • #14
                            look for a set of pc speakers with 12vdc in, one of my set's ( TEAC ) has a power brick which gives the amp 12vdc - plug straight into car - logitech arn't the best make of computer speakers, try a few different manufacturers *videologic sirocco* *cough*ahem*
                            www.digital-car.co.uk - The UK CarPC Forum

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                            • #15
                              If you really want to go down this path (and like others i'd advise you not to):

                              Open the power supply for the Logitech speakers and see if the AC input runs into a transformer of some sort, or it does a direct rectify to DC then some sort of boost regulator. If it's the former, the quality of your inverter will have a huge impact on sound. If it's the latter, you can get away with using a cheap inverter but you'll have to modify the power supply in the computer speakers.

                              A modified sine wave inverter is acutally closer to a square wave inverter than a sine wave inverter (the name is misleading). A modified sine wave inverter will probably give the power supply hell without modification (i can think that the AC input capacitors and RF filters are going to have lots of fun trying to filter out and smooth the harmonics on the AC square waves, they'll become warm quite quickly, and your transformer isn't going to like square waves going into it).

                              You are likely to also have some sort of persistent buzz from the speakers due to harmonics from the inverter which pass through to the computer speaker psu.

                              If you still want to put computer speakers in a car, you'll need to run a pure sinewave inverter to reduce the chance of getting horrible amounts of noise. If you go look at the price for a real pure sinewave inverter, you'll probably find that buying car audio equipment is much cheaper.. ^^

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