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Thread: Speakers using a modified sine wave inverter

  1. #11
    Newbie elmo_eats_rust's Avatar
    Join Date
    Mar 2004
    Minneapolis, MN
    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.

  2. #12
    Join Date
    May 2004
    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.

  3. #13
    Maximum Bitrate jusatry's Avatar
    Join Date
    Nov 2003
    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:

    which gave them a 3.8 out of 5 user rating.....

  4. #14
    Maximum Bitrate
    Join Date
    May 2003
    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* - The UK CarPC Forum

  5. #15
    Maximum Bitrate starfox's Avatar
    Join Date
    May 2002
    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.. ^^

  6. #16
    Newbie Vicci's Avatar
    Join Date
    Apr 2004
    Santa Barbara
    I ran a set of logitech desktop speakers in my car off a 200watt inverter and they ran just fine. They gave no feedback buzz, and I had a nice little powered sub in between the seats. The Elect. Engr guys out there my claim its blasphemy to convert power twice, but it didn't do me any harm. Experience over academia.

    One safety note though: Many cars only support up to 150W coming through the cigarette lighter. That's why you'll find almost all higher-wattage inverters with those meaty aligator clamps. I highly recomend wiring to something more substantial. Check your car's manual to see if your lighter socket can push the kind of wattage you want.

    Sine wave inveters are cheap. Don't let anyone tell you a DC-DC PSU is less expensive. You can get a 400W inverter for around $40 from your local Kragen, Pep-Boys, etc.

    Oh, and 100W speakers don't do you a bit of good if your factory stereo only puts out about 10W/channel, as many mid-level cars do. The amp is what gets you, everytime. Crappy little Lightning amps aren't worth the time or effort of installing them.
    There's nothing you can't do, so don't be discouraged just because no one else's done it.

  7. #17
    Newbie Vicci's Avatar
    Join Date
    Apr 2004
    Santa Barbara
    With car audio amps, you should expect to pay around $1/watt, RMS. If you're paying less, you're not really getting the hundreds of watts they prommise, or they're skimping on some other aspect of the amp. Its not like Lightning can get vastly cheaper capacitors and circuit boards than Alpine. There's gotta be something there, wouldn't you think?

    And as for manufacturers, a good rule of thumb is this: If Crutchfield doesn't sell it, be wary. Don't trust their prices, but their selection includes just about any company worth your time and money.
    There's nothing you can't do, so don't be discouraged just because no one else's done it.

  8. #18
    Variable Bitrate
    Join Date
    Apr 2004
    It takes a certain type of person to use an inverter and and home speakers in their car.

  9. #19
    Variable Bitrate no1knows's Avatar
    Join Date
    Feb 2004
    Guildford, Surrey, UK
    lol, i agree perfectionist. I'm finding this quite amusing.
    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

  10. #20
    Low Bitrate crosseye's Avatar
    Join Date
    Dec 2003
    Syracuse, NY
    I temporarily used a Logitec 5.1 speaker set (125 watts) in my car. It was only $80 on sale at Best Buy. I have a 400 watt pure sine wave inverter that was $30 on sale at PepBoys (and it survives a crank).

    I didn't use the speakers that came with the set. Instead, I used the speakers that were already mounted in my car. I checked to make sure that the impedence (4 ohms, 8 ohms, etc) was the same and the power rating on my car's speakers was greater than the output of the subwoofer/amp.

    I wasn't looking for perfect sound. I got rid of my head unit so I needed something before I had the time and money to spend on a car amp and speakers. I was actually suprised how good this setup sounded. Very easy and quick way of getting powered surround sound into your car. I had Zero problems.

    Seriously, I'd recommend this solution to people on a budget. It sounds good and will get you by until you can purchase car audio equipment and do it "right".

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