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Splitting speaker and wiring for landscaping project....?
I am putting speakers on my backyard and need some help in answering a few questions.
I am running 12 gauge speaker cable throughtout the yard on pvc pipe and installing rock speakers, the specs are below:
Rock Speakers
Tweeter: 5/8” Polycarbonate dome
Woofer: 6 ½” Black polypropylene cone with a rubber surround
Frequency Response: 60 Hz – 20 kHz ± 3dB
Power Handling: 10-80 watts
Impedance: 8 ohms Nominal
Efficiency: 89 dB 1 watt/ 1 meter
Speaker Dimensions: 10 5/8” H x 8 3/8” H x 12 3/8” D
the runs from the source are from 60ft, 80ft, 100ft, 120ft for 4 speakers...I ran 4 cables but I since I bought 6 speakers I am wondering if I can connect 2 speakers to one of those cable runs?
I want to be able to have a louder sound throughtout the yard. I am connecting the speakers to a receiver so that I can hook up an ipod/mp3 player.
I am a speaker newbie, so any advice is welcomed.
If you connect two 8-Ohms speakers in parallel (to the same output of the amp) then the combined impedance will be 4 Ohms. This is per side of the stereo output.
Transistorized amps have a very low output impedance, so they could drive the 4 Ohms load, but now the current in Amperes that the amp has to handle may be more that it could provide. So be careful with the volume.
Something about the wiring: Google search "wire resistance for 12 Gage". You may find Ohms/1000feet. Remember to multiply by 2 (the total length is twice the distance).
You don't want the total resistance to exceed 0.4 Ohms.
About 89dB SPL at 1w/1m:
On each speaker, every time you double the power, you increase the acoustical output by 3dB. So, at 2w you get 89+3=92, at 4w 95dB, etc. A good loud volume is about 102dB SPL (for outdoor background music), so you may need 16w on each speaker, but since each speaker adds to the others, they will output 3dB more.
But now you need to power each with 16w, so you need 32w (per channel).
Confusing!
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