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  #1  
Old 03-03-2011, 10:24 PM
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Default whats my final ohm load???

ok guys i need some help here, i dont really know how to calculate final ohm load. i am gonna be upgrading my door speakers and supertweeters and can use some help on how to wire it all up. heres the info

right now i have:

channel 1-(2) 4 ohm speakers
channel 2-(2) 4 ohm speakers
channel 3-(2) 4 ohm (1) 4/8ohm supertweeter
channel 4-(2) 4 ohm (1) 4/8ohm supertweeter

possible #1

channel 1-(1) 4 ohm speakers
channel 2-(1) 4 ohm speakers
channel 3-(1) 4 ohm (1) 8ohm supertweeter
channel 4-(1) 4 ohm (1) 8ohm supertweeter

possible #2

channel 1-(1) 8 ohm speakers
channel 2-(1) 8 ohm speakers
channel 3-(1) 8 ohm (1) 8ohm supertweeter
channel 4-(1) 8 ohm (1) 8ohm supertweeter

possible #3

channel 1-(1) 8 ohm (1) 4 ohm
channel 2-(1) 8 ohm (1) 4 ohm
channel 3-(1) 8 ohm (1) 4/8ohm supertweeter
channel 4-(1) 8 ohm (1) 4/8ohm supertweeter

the amp im using is a hifonics olympus xi:

125Wx4 @ 4 ohm load
200Wx4 @ 2 ohm load
250Wx4 @ 1 ohm load
400Wx2 @ mono bridged into a 4 ohm load
500Wx2 @ mono bridged into a 2 ohm load
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avh-p4200dvd--smartdisk firelite 120gb hd
ps 2 in glove comp--4 selenium 6w4p---2selenium st-350 supertweets---Hifonics olympus xi (mids and highs)---Hifonics xx zues(lows)----Redtop batt,big 3 under hood---1 c&d 113ah, 1 c&d 75ah in cargo area ---hifonics maxximus 18 prototype @1ohm tuned to 26hz....to be continued
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  #2  
Old 03-03-2011, 10:31 PM
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i dont have anything connected with the amp right now but i do have all the wires ran in the configuration above. if its too confusing im sorry but i really dont have much experience with matching the ohm load with the amp.
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avh-p4200dvd--smartdisk firelite 120gb hd
ps 2 in glove comp--4 selenium 6w4p---2selenium st-350 supertweets---Hifonics olympus xi (mids and highs)---Hifonics xx zues(lows)----Redtop batt,big 3 under hood---1 c&d 113ah, 1 c&d 75ah in cargo area ---hifonics maxximus 18 prototype @1ohm tuned to 26hz....to be continued
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Old 03-03-2011, 11:29 PM
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Here is a calculator that lets you calculate final impedance. http://www.bcae1.com/spkrmlti.htm
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Old 03-03-2011, 11:59 PM
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Quote:
Originally Posted by gregthelamb View Post
Here is a calculator that lets you calculate final impedance. http://www.bcae1.com/spkrmlti.htm
cool thanks for that link, i think i may do possible #2, which will consist of 4 selenium 6w4p's for each door and a pair of the crescendo supertweets for rear fill in the d pillars. some may say its a waste to put speakers there but i actually have used some legacy supertweets in that location and ran everything off the HU and i could really tell the difference....what do you think?

channel 1-(1) 8 ohm speakers
channel 2-(1) 8 ohm speakers
channel 3-(1) 8 ohm (1) 8ohm supertweeter
channel 4-(1) 8 ohm (1) 8ohm supertweeter
__________________
avh-p4200dvd--smartdisk firelite 120gb hd
ps 2 in glove comp--4 selenium 6w4p---2selenium st-350 supertweets---Hifonics olympus xi (mids and highs)---Hifonics xx zues(lows)----Redtop batt,big 3 under hood---1 c&d 113ah, 1 c&d 75ah in cargo area ---hifonics maxximus 18 prototype @1ohm tuned to 26hz....to be continued
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Old 03-04-2011, 12:35 AM
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Quote:
Originally Posted by [email protected] View Post
cool thanks for that link, i think i may do possible #2, which will consist of 4 selenium 6w4p's for each door and a pair of the crescendo supertweets for rear fill in the d pillars. some may say its a waste to put speakers there but i actually have used some legacy supertweets in that location and ran everything off the HU and i could really tell the difference....what do you think?

channel 1-(1) 8 ohm speakers
channel 2-(1) 8 ohm speakers
channel 3-(1) 8 ohm (1) 8ohm supertweeter
channel 4-(1) 8 ohm (1) 8ohm supertweeter
If it sounds good to you then you're good to go

Make sure your amp can drive 8 ohm speakers though because in general amps lose about 1/4 to 1/2 of their power every doubling of the impedance. I.E. 50 watts at 4 ohms will be 25-35 watts at 8 ohms.
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Old 03-04-2011, 01:20 AM
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how are you doing xovers for all of that?

8ohm is fine as the stuff he's running is in the 96-100+ sensivity range.
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  #7  
Old 03-04-2011, 02:29 AM
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Quote:
Originally Posted by mlstrass View Post
how are you doing xovers for all of that?

8ohm is fine as the stuff he's running is in the 96-100+ sensivity range.
no crossovers just straight to the amp and the deck settings.dont think the seleniums come with crossovers but im not really concerned with it. i just want somethin a lil more louder than these zxi63's i got running off the HU
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avh-p4200dvd--smartdisk firelite 120gb hd
ps 2 in glove comp--4 selenium 6w4p---2selenium st-350 supertweets---Hifonics olympus xi (mids and highs)---Hifonics xx zues(lows)----Redtop batt,big 3 under hood---1 c&d 113ah, 1 c&d 75ah in cargo area ---hifonics maxximus 18 prototype @1ohm tuned to 26hz....to be continued
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  #8  
Old 03-04-2011, 04:21 PM
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Default

Quote:
Originally Posted by gregthelamb View Post
If it sounds good to you then you're good to go

Make sure your amp can drive 8 ohm speakers though because in general amps lose about 1/4 to 1/2 of their power every doubling of the impedance. I.E. 50 watts at 4 ohms will be 25-35 watts at 8 ohms.
well from using the ohm calculator, without bridging anything the final ohm load on each channel should be 4ohm and the amp pushes 125x4 @ 4ohms but if i bridge it i can drop it down to 2 ohms @ 500x2. so are you saying that the 8ohm speaker itself will be a hard on the amp or are you saying an 8ohm load will be hard on it?
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avh-p4200dvd--smartdisk firelite 120gb hd
ps 2 in glove comp--4 selenium 6w4p---2selenium st-350 supertweets---Hifonics olympus xi (mids and highs)---Hifonics xx zues(lows)----Redtop batt,big 3 under hood---1 c&d 113ah, 1 c&d 75ah in cargo area ---hifonics maxximus 18 prototype @1ohm tuned to 26hz....to be continued
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