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Thread: Newb Question - 4ohm speakers on a 6ohm outputs

  1. #21
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    Quote Originally Posted by ecc83 View Post
    42low, I am pretty sure English is not your first language and so your comments are not coming across very clearly.
    I too think here's the problem of language barrier.

    Quote Originally Posted by ecc83 View Post
    Now, what I have to say MIGHT be a challenge to your opinion but it is what I and many top technical people in the industry believe to be the case.

    1) Any competently designed audio amplifier OF SUFFICIENT power will sound the same as any other good power amp and that has been accepted for decades. Many times the tweaky, beardy subjectivists have argued "The XYZ sounds thin and distorted. The YZX is smooth and faster" Mind you, they change their preferences every few years about the SAME designs!

    2)The sound quality of a loudspeaker is not affected by the impedance chosen. Most "hi fi" speakers are nominally 8Ohms but there are/have been 6R units. One of THE most respected speakers ever made, the Rogers LS35/A was originally at least, 15 Ohms. Some early very HQ speakers were of very complex impedance and a sod to drive. The early Spendors blew one or two "lesser" power amps! Modern amplifier technology at monitor prices and quality levels are virtually bomb proof.

    And lastly, the interior of a car is a bloody awful place to judge the finer points of sound! Even if it is not moving (when the noise floor will be about 80dBSPL!) the tiny tin box is not conducive!

    Dave.
    .... cause this is exactly as i (try too) say.
    As long as the speakers ohms are higher than the amps ohms are as much as the watts are higher the sound get's better/deeper/more power. In reverse the amp needs to deliver more which it quickly can't, with lack power in the actual sound. The 6 ohm you've mentioned are mostly (if not always) designed next to 6 ohm amps.

    I may not be a music business technical, but i've done my lessons on electronics in school with good results. And those same calculations made me blow away my friends. And i can tell you that the levels and sounds we reached, and the differences between in the cars were perfectly to be heard (and to be seen at the car's body and accessories )
    Start calculate with the ohms, watts, voltages and amperes and you can no other than say i'm right. (or let a specialist calculate for you)

    In this case, as i said no different, the 4ohm speakers on the 6 ohm amp can go perfectly right if the amp feeds enough watts (at least about 1,5 times the speakers need), which in many cases is not.

  2. #22
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    I'm not sure why no one has addressed the fact that he put an automobile door speaker in a vented home speaker cabinet. I am really surprised it doesn't sound like complete dog crap, since he is running two tweeters. (the original one and the one on the coaxial car speaker) The phase weirdness from the tweeters not being aligned should keep him from wanting to turn the volume up to the point that the impedance would roach the amp.
    Jay Walsh
    Farview Recording. I am also the forum spokesmodel for Terasyne Amplification

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  4. #23
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    Quote Originally Posted by 42low View Post
    What i meant to say in the beginning is that the sound changes.
    And correct it is for sure.
    What i did in my car was 8ohm speakers on 4 ohm amps, which gave me almost double the sound in good quality. And for that only half the amp's wattage is needed. Were i with 200W/8ohm set easily blew away my friends with there 300W/4ohm set, and that with good quality sound.

    So if i reverse that, double the amp wattage is needed to feed the speakers. And as mostly speakers already are of higher wattage as amps are, this problem will only be made bigger, with worst sound in the end (cause the amps can't feed the speakers enough).

    Try both options. If the amp and speakers are to far away from each other, you will hear that less ohm speakers won't give a good deep sound (not that big a problem if the amp has enough power).
    If the different speakers sounded better and/or l;ouder it was because they were different speakers which inherently had better sound or were more efficient.

    Amps do NOT put more power into higher loads ..... period.
    If you know the secret codes you can get by the mastering boss on level 8.

  5. #24
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    Quote Originally Posted by Farview View Post
    I'm not sure why no one has addressed the fact that he put an automobile door speaker in a vented home speaker cabinet. I am really surprised it doesn't sound like complete dog crap, since he is running two tweeters. (the original one and the one on the coaxial car speaker) The phase weirdness from the tweeters not being aligned should keep him from wanting to turn the volume up to the point that the impedance would roach the amp.
    Thank you everyone for your input and knowledge, I'm learning a lot about impedance and a lil about history..
    I used an automobile speaker because as I have said earlier I could not find a speaker in a 5.25" size let alone a 8 ohm speaker, kicker was the only brand I could find that made a speaker in that size..and I'm not running two tweeters, the original tweeter were blown and removed, all that's running is the coaxial and surprisingly it doesn't sound like crap..there are decent lows, but what I was looking for was highs and midrange and in that respect they deliver..since my first post I'm now using a rotel amp now that is 4-8ohm at 180w RMS

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    Ya, I've got old Jensen Tri-Ax in boxes and some heavy duty MTX 6x9 with 1" domes in 2 cu. ft. boxes. I switched out the plastic dome with a cloth one. 5.25" were, increasingly, becoming component units, rather than full range in the early '80s - engineered co-ax to go with a sub

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