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  #1  
Old 08-29-2006, 12:29 AM
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more ohms = less wattage.. advantages?

I know that by increasing the ohms running to a sub... it will reduce the wattage going to the sub? what are the advantages of having something like 8 ohm? I do not really understand the concept of it. Could any explain?

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  #2  
Old 08-29-2006, 12:58 AM
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Dont know about sub but for speakers best is 2ohm like Bose....more efficient and LOUDER with lesser power required...aftermarket junk always have 4-8 ohm...no wonder people need big amps.
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  #3  
Old 08-29-2006, 01:39 AM
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typically home audio equipment is 8ohms...car is 4 or 2...

When the electricity passes into the speaker, some of it is 'resisted.' The ohms rating of the speaker is how much is resisted, and an indication of how much energy it takes to drive it - the higher the ohms rating, the more difficult it is to drive.

"Higher Or Lower?

Impedance restricts the flow of power from your receiver or amplifier. So it stands to reason that less impedance would be better, right? More flowing power is always better, right? RIGHT?! Ha. Truth is a low impedance load-large pipe-stresses a receiver or amp by asking it to put out more current, and that can be bad especially if your amplifier is incapable of putting out the amount of current the low impedance speaker demands.

Using our water pipe analogy, increasing the pipe diameter (lowering the impedance) increases the water flow (current) but causes the water pump (amplifier) to work harder to maintain the desired amount of water pressure (voltage). In cases where a low quality amplifier attempts to "drive" (pump) its small amount of power into an impedance that is too low (too large a pipe), it may overheat and shut down. In extreme cases, the receiver can break. Some receivers and amps are built to put out "high current" flows and can drive virtually any real-world speaker load without breaking a sweat. But many, particularly in the lower-cost range, simply cannot. Trying to get more power out of an amp that's not built for it is a sure way to wreak destruction. (Stay tuned for some practical receiver and amplifier evaluation/ shopping tips later in the program.)

So, higher impedance is better? No. Impedance that is too high restricts the flow of current, vital current that a speaker needs in order to play loudly for next weekend's house party.

For most low to mid-grade electronics, and for most average speaker owners, a speaker impedance specification in the 6-8 Ohm range (the most common kind) represents a good compromise between current and voltage flow. That is to say, most amplifiers and receivers can safely drive speakers with 6-8 Ohm specs to enjoyable levels."

http://www.hometoys.com/htinews/feb04/articles/polk/impedence.htm
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Last edited by JamesDean; 08-29-2006 at 01:44 AM.
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  #4  
Old 08-29-2006, 12:44 PM
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Thanks for the lesson

Thanks for the lesson on impedance. What is your opinion of Bose's speakers? I have heard it said that theirs were some of the most efficient and, therefore best for car stereos. It sounded logical. I suppose this may be true as long as you match your amp to the speakers, if I have understood you correctly.

Now, about the water. Where does that go? and is there a belt on the engine turning taht pump . . .
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  #5  
Old 08-29-2006, 04:57 PM
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Bose makes quality equipment, but for the money there are alot of better alternatives.
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Old 08-29-2006, 05:00 PM
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Quote:
Originally Posted by woodall33 View Post
Bose makes quality equipment, but for the money there are alot of better alternatives.
and your preferred alternative is . . . ?
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  #7  
Old 08-29-2006, 05:08 PM
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To name a single brand is impossible. Also, what is your goal? Impeccable sound quality, spl, etc? If you are looking to truely reinstall your audio system (top to bottom) and have the best, Bose is not it.

I would probably recommend something like Image Dynamics for one. They make a very nice line of reasonably priced drivers (subs to tweets) that, unless horribly installed, will give a more robust and accurate sound than Bose. Thats just one option, and certainly not the only one.

Amps? Processing? Many many many choices.

Your end result is a product of labor and thought, more so than throwing money at it. So if you get a game plan of what you want, find a nice line of equipment in your budget, and put the effort into the installation and tuning, you can probably make Radio Shack speakers sound good. Of course, the nice equipment doesn't hurt either...just saying the installation is as important, actually more important than the equipment you pick.
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  #8  
Old 08-29-2006, 05:36 PM
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A freind of mine wants to put bose speakers in the front doors of his W202 non bose system using the stock head. They are the (2) 4.5" full range bose drivers rated @ 2ohm...will they work? The non bose stock head powers 4ohm speakers.
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  #9  
Old 08-29-2006, 06:00 PM
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hmm...it migh work..but it wont sound very good. if the headunit isnt designed to run with a 2ohm load it might overheat or somthing bad...the 2ohm load will force the hu to run at 2ohm to provide power....im not entirely sure though...I belive one can wire up two speakers to make it appear as a 4ohm load to the hu...one can do this..but then one looses the ability to control left to right fade....i never use it though so if it was me i would wire up the two speaker like this:
wire it in the manner of:



that way it will be a 2 x 2ohm speakers presenting at 4 ohms. but now we must ask does the h/u have sufficient power to run these? most headunits put about 22watts rms / channel.
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  #10  
Old 08-30-2006, 11:43 AM
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Yeah, if you hook up a 2ohm load to a 4 ohm deck, you'll probably over heat it and see unreliable performance in some manner. I don't think you'll affect the actual sound, as you probably are not using any kind of passive processing or filtering, but you are definitely running the chance of damaging the deck. The lower the impedance, the more current is going to be allowed to flow...meaning, if the internals of that deck's amplifier are not beefy enough to handle that kind of current flow, you may definitely see magic smoke. You're deck is probably putting out, 12-13 Wrms at best anyway, and thats at 4 ohm rating. So at 2 ohm, you're going to give it the chance to push out 24-26 Wrms, and it may not be able to do that for a very long period.

If you wire your 2 front speakers in series to make for one single 4 ohm load, you lose you're left/right stereo, making all the information mono, why upgrade speakers for mono, stock will sound better as it will still deliver the information in stereo...plus, what are you going to do with your other channel? I can't say that it would be a good idea to run a single 4 ohm load on either the right or left channel. (leaving the opposite channel empty)

Of course, you can have 4 of those 4.5" speakers. Series wire a pair of them (one pair left, one pair right) and you'll get the correct impedance...but then your trade off is
1) installation and mounting
2) possible cancellation, meaning you may have to get tricky with phase of each driver
3) each driver now sees half the original power, so you're right back to delivering that 12-13 Wrms.

Easiest solution, add an amp that is capable of a 2 ohm stereo load (very common, a simple 25x2 amp will deliver roughly 50x2 at 2ohm, so gain way down and enjoy) or ditch the 2 ohm speakers and go with a 4 ohm model if you want to use that deck's power.

Last edited by woodall33; 08-30-2006 at 12:05 PM.
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  #11  
Old 08-30-2006, 11:53 AM
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I suppose you can also look for impedance matching circuits, and/or plans to construct it. They shouldn't cost much, and if you build your own, just go to mcm's website to order your parts. From what I can see, they are the cheapest on components like resistors, caps, and such.
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  #12  
Old 08-30-2006, 02:44 PM
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Quote:
Originally Posted by woodall33 View Post
Easiest solution, add an amp that is capable of a 2 ohm stereo load (very common, a simple 25x2 amp will deliver roughly 50x2 at 2ohm, so gain way down and enjoy) or ditch the 2 ohm speakers and go with a 4 ohm model if you want to use that deck's power.
i agree. i would do this.
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  #13  
Old 08-30-2006, 11:33 PM
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Quote:
Originally Posted by BenzOnline View Post
Dont know about sub but for speakers best is 2ohm like Bose....more efficient and LOUDER with lesser power required...aftermarket junk always have 4-8 ohm...no wonder people need big amps.
You have no knowlage of car audio. Bose good? HAHAHAHAHA!!! You've obviously never heard anything with a metallic woofer, a silk tweeter, a proper crossover, rubber surrounds, and good power going to it.

Bose is CRAP!!! Bose is NOT 2ohm, it's 4 ohm... The GM speakers I removed from my trofeo were 10ohm

Aftermarket junk? I dont exactly see anybody entering audio compitions (spl, AND sq) with stock equipment. Stock is designed to be cheap, and have easy fitment...


Big amps? Power is money, do you think any auto company is going to spend alot of money on their audio system? NO!!! (and I hope not, because theres more importiant things to worry about)

By saying "big amps" are required to make alot of quality noise, I akin your statment to saying "big engines" are required to go fast.

Yeah, It helps... but there's other things to worry about... YES you do need more power for more sound, I really doubt you've been in a properly setup vehicle...

BTW there are 1 OHM subwoofers, and 2 ohm speakers...

~Nate
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  #14  
Old 08-30-2006, 11:43 PM
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i have Bose home-theatre speakers and they are pretty good. Bose 301 Series III, Bose 601 (from the 70s--now broken after a loud session inwhich they havent seen in some 30 years so ..they died but when they were alive they were good) and Bose 141s.

If you want some great sounding speakers check out Beyma. They are a little known Spanish company that manufactures loudspeakers. They have a car audio line but it can get pricey. I have a pair of DJ speakers similiar to these http://usspeaker.com/speakers%20Pro-BE112-1.htm but mine are 15" drivers and are about 700-800watts rms. Combined with a pair of APT-150 High Frequency Drivers and a pair of Italian built "18 Sound" dual 18" subwoofer.....the vocal and intrumental reproduction is impeckable. I would like to hear what their car audio stuff sounds like.

beyma car audio: http://usspeaker.com/Beyma%20Car%20Audio-1.htm

My 300SD has Polk DB460s and Polk DB650s
My 190E has Boston Acoustics 6.5 Component Series (front) and Boston NX57's rear plus JL Audio 6w0s (not in use) and a temporary sub 2x Infinity 1242w's....

Boston Acoutics or Beyma. Imo.

Kris
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  #15  
Old 08-31-2006, 10:56 AM
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I like JBL, it must be ther German engineering in them

Too bad I can only afford phiox gold xion speakers, and profile amps... My spelling is attosious, o well...

~Nate

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