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Wiring for running 4 speakers from amplifier

Hi,
I would be grateful for your help.
I want to install 2 sets of 4 ceiling speakers (30HZ-20KHZ 2 way full range 8 ohms 89db). I have 3 amps and I can utilse all if neccessary. I have;
NAD 7125 50HZ 150w which has a toggle switch to set to either 4 ohms or 8 ohms.
Denon PMA 256Uk 50HZ 120w which states it's impedence is 4 ~ 16 ohms.
Finally an amp called a Project 7 for which the only information available is that it is also 50HZ.
Do I use one amp per 4 speakers, do I run 2 from each channel in parallel or do I set them up in series?
What setting do I use on the NAD amp?
can you draw me a wiring diagram please?
Your help will be much appreciated as I have to take up all my carpets and lift floor boards to run the cabling before the electrician comes tomorrow (he is fitting lights).
Regards
Nick

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I asked about wiring up 4 speakers from oe amplifier....not about Tom Tom?

It does not inspire me with confidence in your abilities if you get confused between customers and their questions, so I will look elsewhere for answers.
Thanks anyway

Posted on Jul 04, 2008

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How many watts is my jl audio 2150 amplifier


It depends on whether you have the M2150, A2150, or E2150.

M2150 Class A/B Two-Channel Full-Range Amplifier Specifications:
Rated Power 14.4 V Stereo: 70 W RMS x 2 @ 4 ohm, 110 W RMS x 2 @ 2 ohm
Rated Power 14.4 V Bridged: 140 W RMS x 1 @ 8 ohm, 220 W RMS x 1 @ 4 ohm
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THD at Rated Power: 12.5V: <0.08% THD, 20Hz-20kHz, 14.4V: <1% THD, 20Hz-20kHz
S/N Ratio: >104 dB referred to rated power (A-weighted, 20Hz-20kHz noise bandwidth)
Frequency Response: 10 Hz-25 kHz (+0, -1dB)
Damping Factor: >200 @ 4 ohm per ch. / 50 Hz, >100 @ 2 ohm per ch. / 50 Hz
Input Range: 200mV, 8V RMS

E2150 Class A/B Two-Channel Full-Range Amplifier Specifications:
Rated Power 12.5 V Stereo: 45W RMS x 2 @ 4 ohm, 75W RMS x 2 @ 2 ohm
Rated Power 12.5 V Bridged: 90W RMS x 1 @ 8 ohm, 150W RMS x 1 @ 4 ohm
THD at Rated Power: <0.08% @ 4 ohm 20Hz-20kHz
S/N Ratio: >104 dB referred to rated power (A-weighted, 20Hz-20kHz noise bandwidth)
Frequency Response: 10Hz-25kHz (+0, -1dB)
Damping Factor: >200 @ 4 ohm per ch. / 50 Hz, >100 @ 2 ohm per ch. / 50 Hz
Input Range: 200mV, 8V RMS

A2150 Class A/B Two-Channel Amplifier Specifications:
Rated Power 12.5 V Stereo: 45W RMS x 2 @ 4 ohm, 75W RMS x 2 @ 2 ohm
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THD at Rated Power: <1% @ 4 ohm 20Hz-20kHz
S/N Ratio: >104 dB referred to rated power (A-weighted, 20Hz-20kHz noise bandwidth)
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Can i bridge a Sony Xm-1652Z 2 Channel amp to 2 subs it gives me 2ohms


No - it is not 2 ohm mono stable

  • 1000W max power
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  • 200W x 2, 20 - 20kHz, @ 0.15% THD + N, at 2 Ohms
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  • Pulse power supply
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  • .3-6V Level Adjustment Control (RCA Pin Jacks) 1.2-12V (High Level Input)
  • 80 Hz, -18dB/octave Low Pass Filter Switch



Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

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1 Answer

How many ohms is this amp


your amplifier has the following specs:

Output Power at 12V:
1 x 200W @ 4 ohms (0.05% THD, 20Hz - 20kHz)
1 x 400W @ 2 ohms (0.5% THD, 1kHz)
Output Power at 14.4V:
1 x 300W @ 4 ohms (0.05% THD, 20Hz - 20kHz)
  • 1 x 600W @ 2 ohms (0.5% THD, 1kHz)

May 10, 2010 | Kenwood KAC-X401M Car Audio Amplifier

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What speaker componets do need to buy?


  • 1000W max power
  • 165W x 2, 20Hz - 20kHz, @ 0.04% THD + N, at 4 Ohms
  • 200W x 2, 20 - 20kHz, @ 0.15% THD + N, at 2 Ohms
  • 400W x 1, 20Hz - 20kHz, @ 0.1% THD + N, at 4 Ohms
  • OTL (Output Transformerless) circuit
  • Pulse power supply
  • Line & High Level Inputs
  • .3-6V Level Adjustment Control (RCA Pin Jacks) 1.2-12V (High Level Input)
  • 80 Hz, -18dB/octave Low Pass Filter Switch
And i would say that the best use of this amplifier would be for sub-woofers.

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Speaker linking


You know, watts is a heat dissipation unit... It tells nothing about your speaker, the usage you wanna do with it, and what about the amp! Usually on proffessionnal amplifier ( i mean touring power amp) we rely 2 speakers in parallel per side of amp. It turns the amp working at 4 ohms and ifs it pushed by a good amp, and a reasonnable operator, things goes find. If amp ''clip'' it sending DC in the speakers and you actually in the way of a repair. So its now having too much power amp that usually breaks speakers, but too small amp. Check the specifications of what your amp can gives at 20hz to 20khz, both channel driven at 4 ohms. You find out that the amp you believe was sending you 500watts is giving you only 250... Thats why pro series of amp cost so much. Because they are not playing on words but giving power... Cheap series of pro amp counts wattages at 4ohms one channel driven at 1khz at 1% distortions wich is unnaceptable. 0.1% is the max acceptables. Go meet the tech at your local big touring sound contractor and ask for the real thing. You'll get the right answer and analysis of your kit...

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AMP POWERS UP, I CAN HEAR IT WORKING BUT THE SOUND IS REALLY REALLY LOW...


Hello korre,

Low output could be the head unit, the speakers of the amp itself. Start by isolating the problem.

1) Test the sub(s) on a known good output.
2) Input a known good signal. A portable with RCA preamp outs will work OK.
After you have eliminated the other components, troubleshoot the amp itself:

1) Check the onboard fuses. The M605 has 2 each 30A fuses just to the left of the power and ground terminals.
2) If it was just installed, then my first suspicion would be a problem in wiring. If one tiny little strand of your speaker wires comes into contact with another wire or ground point, it could present just enough of a signal path to ground out most of your power, and perhaps still allow the amp to seemingly operate normally (at least for awhile). Check power and ground too.
3) Make sure your head unit RCA's are plugged into the inputs and not the outputs.
4) Check the low-pass and subsonic filter settings. If low pass is turned all the way down, the amplifier would ONLY send frequencies below 30Hz to the speakers. Subsonic turned on and the low pass all the way down would effectively result in no sound.
5) Remove the top cover to access the mode controls and display. Check the input level.

If everything checks out, the amp probably has a defective component and needs factory/service center repair.

Hope this helps.

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Sony amp model 1652z


1000W max power
<b>
165W x 2, 20Hz - 20kHz, @ 0.04% THD + N, at 4 Ohms
200W x 2, 20 - 20kHz, @ 0.15% THD + N, at 2 Ohms
400W x 1, 20Hz - 20kHz, @ 0.1% THD + N, at 4 Ohms
</b>
OTL (Output Transformerless) circuit
Pulse power supply
Line & High Level Inputs
.3-6V Level Adjustment Control (RCA Pin Jacks) 1.2-12V (High Level Input)
80 Hz, -18dB/octave Low Pass Filter Switch

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1 Answer

Subwoofers


This will depend on the amplifiers capabilities.

I will give 2 different scenarios.

#1 Stereo configuration

If the amplifier supports an RMS power output close to the RMS input power of the subwoofers then run the amplifier in stereo mode. For example 150 watts RMS X 4 channels driven at 20-20khz. (If you can provide a model # for the subs and the amp your looking at I can help you further with this decision.

Wiring for this is easy and simply involves matching the connectors for 2 of the channels (Front or Rear) to each of the subwoofers.

#2 Mono Bridged mode.

If the amplifier is lower power but mono bridgable you can bridge two Pairs of channels and power each of the subwoofers this way.

Generally speaking a 2 channel bridgable amplifier will be able to at least combine the wattage of each channel into a single monural channel and in many cases its actually higher.

So you would bridge the front 2 channels into a single bridged mode for one subwoofer. and then you could bridge the read 2 channels into another bridged mono channel for your other sub woofer.

For example if you had bridgable amplifier thats 50 watts RMS X 4 you coudl very likely (Generalization based on quality of amplifier) send 150 watts RMS to each subwoofer.

Again I would need to know what amp you're refering to to provide specific wiring instructions. Many Bridging amplifiers either have a single switch that will send them to bridged mode or you would use the positive + terminal from one channel and the negative - terminal from the other channel or a combination of both.

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Wiring Diagram for Sony car amplifier XM-554ZR


You can download the installation manual from the link below: http://www.sony.co.id/support/product/xm-554zr?site=hp_en_ID_i It has the following diagram plus other hookup info... Please update the question & let us know if the information given was useful to you - Good Luck!

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