An Impedence of Z1=5-j4 is connected in parallel with another impedence Z2=6+j8 ohm.this cicuit is then connected in series to an impedance o Z3=4+j5 ohms.The combination is then connected in parallel to an impedance of Z4=5+j6 ohms.the current flowing through Z1 is 12<0 amps. calculate the suppl voltage and total current

The output of a speaker primarily depends on system design (obviously) However, perhaps you have sourced a replacement or 'upgrade' speaker for an existing system. In that case, perhaps you have an impedance mismatch. If your amplifier is designed to drive, say, an 8 ohm speaker, and you connect a speaker of 16 ohms impedance, then your sound will be softer. On the other hand, you may have connected more than one speaker to one power amplifier output. If you connected in series you add the impedances. If connect in parallel you work out the impedance using this formula:
1/Answer= 1/Speaker A impedance + 1/Speaker B impedance + 1/Speaker C impedance etc. So if you connect three speakers in parallel, each of 8 ohm impedance:
1/Answer=1/8 + 1/8 + 1/8 = 3/8
3X Answer=8
Answer = 8/3 = a little less than 3 ohms.
Reducing the load like this makes the sound louder, but risks distortion or even damage. Check your manual for amplifier tolerances. Cheers, Don.

Hello
The output impedence of the amp is 8 Ohms. It can also be connected to a 4 Ohms speaker, but the reted output will be higher than specifed, and the sound quality will be reduced. You cant get an putput impedece to this amp by no means, as its' output is desigend to match 8 Ohms/channel. If you have only spekers with 4ohms impedence, connect two of the in serieal connection, so that, they together will reach a resultant impedence of 4Ohms. Similarly connect an other two spekers in series to the other channel too. OK.

Hello
Check the impedence of the connected speakers. if any impedence mismatch is there, the amp will sense it and will cuto the output OFF. Use only specified speakers only. The impedence of speakres are expressed in "Ohms". Select all speakers of same impedence. If 6 Ohms is the output impedence of the amp, use only that Ohms speaker. Never use a speaker less that this Ohms. You can use a higher impedence speaker, say 8 Ohs or 16Ohms. But never use lower impedence speakers, of connect two speakers in parellel connection, which will relult in overloading. I think that I've made a satisfactory solution to you. Please don't hesitate to rate this solution. Good luck
Wish you a Merry X'mas and Happy 2012.
Gopakumarg43

HelloCheck the output impedence [indicated in OHms]]. You can get it from its manual. If it is designated as; 8OHms for example; you can connect one 8OHMs speaker direltly, or two 4 OHMs speakers in serieal connection. Likeways, if the output impedence is 6OHms, you can connect one 6OHms speaker direltely, or 2 12OHMs speakers in parellel. Just see, when we connect thow speakers in serieal, the impedence will be the sum of both speaker impedences. if we connect the same in parellel, the impedence will get halved. OK.

There is a way to do this, but it is awkward and is not recommended. Depending on the impedence of the door speakers and how many there are. I am assuming from your posting that you have a 2 channel amp. If you wire the two speakers for each seat in series (creating a 4ohm load), then wiring both seats in parallel (putting the load to 2ohms), these could theoretically be wired to one channel. BUT, this will not give you balance left and right. Also, if the impedence is different, you run the risk of damaging the amp.

If your amo is a subwoofer amp yes you want a LPF. Low pass filters are capable of passing low frequency energy. As far as the impedance of your amp goes check with the manufacturer for proper the proper load. What speaker config do you have?

2 DVC 8 ohms in parallel (voice coils) then series (speakers) are 8 ohms
2 DVC 4 ohm - in parallel (voice coils) then series (speakers) are 4 ohms

DVC is dual voice coil

Impedence for parallel is (Z1^-1+Z2^-1)^-1 or 1/((1/Z1)+(1/Z2))
Use those to figure out parallel impedance, series you just add them together.

For parallel connections, simply wire posotive to positive and negative to negative. But beware! this lowers the impedence (ohms) by half. In other words if you have 4 ohm woofers, in parallel they would be two ohms. Make sure your amp can handle that. Otherwise connect them in series.

I just saw in the title that you're getting a Low Impedance indicator on the receiver...

Following what I said earlier, when you have multiple sets of speakers selected they connect in parallel, effectively presenting a lower impedance than either pair does alone. If your receiver is warning you of Low Impedance you could

A) Ignore it if it doesn't have any audible effects; or

B) Avoid the issue by not running the speakers together or

C) If you must have them running together, wire them in series with each other to present a higher load to the amp and connect each pair of series speakers to the A or B terminals. It would look like this...
spkr A spkr B

XXXX XXXX
L ++++++++XXXX++++++++XXXX
L --------------- XXXX--------------- XXXX
XXXX XXXX

XXXX XXXX
R ++++++++XXXX++++++++XXXX
R --------------- XXXX--------------- XXXX
XXXX XXXX

The easiest way to think of wiring voice coils and subs is this:

• Two items of the same impedance in parallel = Half of the impedance
• 4 ohms in parallel with 4 ohms = 2 ohms
• 8 ohms in parallel with 8 ohms = 4 ohms
• Two items of the same impedance in series = Double the impedance
• 4 ohms in series with 4 ohms = 8 ohms
• 8 ohms in series with 8 ohms = 16 ohms

In this case, you want to wire two subs, each with dual 4 ohms voice coils, so that the total equals 2 ohms. Your options are:

• DVCs in parallel, 2 subs in series = 4 ohms
• DVCs in series, 2 subs in parallel = 4 ohms
• DVCs in parallel, 1 sub = 2 ohms

With two, dual 4 ohm subs, you can only have 1 ohm or 4 ohm total impedance.

Whether you should run them series or parallel depends on the ohms of the speakers and the rating of the amp. If the amp rating is 2 ohms and the speaker are 4 each, then you can run parallel. When you connect speakers in parallel, the total impedance (ohms) is calculated by dividing the impedance of one speaker by the number of speakers, assuming they're all the same. When in series, add the speaker impedances together (i.e. 2 speakers 4 ohms each=8 ohms) Going over the amp rating doesn't hurt anything but the level of sound, but when you go below it, you'll eventually burn out the amp.

Hope this helps, and please rate my advice.
Thank you, and good luck!!