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How Do I Connect External Speakers to Rowe CD100 Bubbler?

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Ken Layton:
The 70 volt speaker terminal strip allows you to hook the 70 volt speakers up either as mono or stereo. In many of our locations we had which had ceiling speakers, we generally connected the ceiling 70 volt speakers as mono. Quite frequently this was because the existing speaker wiring was already wired as mono. No sense in wasting time stringing more wires to do stereo.

cqlink:

--- Quote from: Ken Layton on March 17, 2021, 12:20:04 pm ---The 70 volt speaker terminal strip allows you to hook the 70 volt speakers up either as mono or stereo. In many of our locations we had which had ceiling speakers, we generally connected the ceiling 70 volt speakers as mono. Quite frequently this was because the existing speaker wiring was already wired as mono. No sense in wasting time stringing more wires to do stereo.

--- End quote ---
Switching direction because it appears most 70v transformer speakers have somewhat poor sound quality.  I'd like to use two, 8ohm PolkMC80 speakers.  They handle 100W.

Bruce at A&B Jukebox advised me to move the E7 wire to E5.  Both common speaker wires to E1 tap and the (+) speaker wire to E4 tap.

Any issues with this?

Can I run speakers parallel in this configuration?

Thanks!

cqlink:
For those following,  according to electricians at a local shop the response to my last question regarding the switch to the two, 8-ohm speakers,  is to move the internal,  E7 wires from both channels to the respective E5 or E6 tap.  Leave the E1 jukebox wire at E1.

The (-) wires from the 8-ohm speakers go to the E1 tap.

The (+) wires from the 8-ohm speakers go to the E4 tap (or E5,  if you move the R and L internal speaker wires to the E6 tap).

Watch the overload lights on the amp and adjust (if necessary).

Keep in mind,  I'm only using two Polk Audio MC80 8" external speakers.  I'm not an expert but you'll likely need to run more than two 8-ohm speakers in series.  The experts here can chime in if this is accurate.
 
As I'm not as experience as many are on this site,  I'll post pictures when I've finished the installation.

Cheers :cheers:

Ken Layton:
Keep in mind Rowe amplifiers do not like loads of less than 4 ohms (4 ohms is as low as you should go). When wiring speakers in parallel, you divide the impedance in half with each speaker added. Examples: two 8 ohm speakers in parallel = 4 ohms and two 4 ohm speakers in parallel = 2 ohms (the amplifier is going to fry). Always try to keep the speakers you use to the same impedance (i.e. all 4 ohm or all 8 ohm) to make your impedance and wiring calculations easiest.

Different impedances connect to different terminals on the speaker terminal strip. When running external low impedance speakers, I always drop the internal jukebox speakers to no more than tap E5.

Also be aware that many speakers sold today may say "8 ohm Compatible" on their specs or box. This is a fancy way of saying they are NOT really 8 ohms but are really 6 ohms. So if you parallel two of them, it would make a 3 ohm load on the amplifier and damage it.

When we had to use external low impedance speakers with the jukebox internal speakers, I would wire them in "series-parallel" combinations. This was so I could present either a 4 ohm or 8 ohm or 16 ohm load to the amplifier. Series-parallel wiring can get complicated plus running tons of additional wires.

cqlink:

--- Quote from: Ken Layton on March 31, 2021, 12:21:48 pm ---Keep in mind Rowe amplifiers do not like loads of less than 4 ohms (4 ohms is as low as you should go). When wiring speakers in parallel, you divide the impedance in half with each speaker added. Examples: two 8 ohm speakers in parallel = 4 ohms and two 4 ohm speakers in parallel = 2 ohms (the amplifier is going to fry). Always try to keep the speakers you use to the same impedance (i.e. all 4 ohm or all 8 ohm) to make your impedance and wiring calculations easiest.

Different impedances connect to different terminals on the speaker terminal strip. When running external low impedance speakers, I always drop the internal jukebox speakers to no more than tap E5.

Also be aware that many speakers sold today may say "8 ohm Compatible" on their specs or box. This is a fancy way of saying they are NOT really 8 ohms but are really 6 ohms. So if you parallel two of them, it would make a 3 ohm load on the amplifier and damage it.

When we had to use external low impedance speakers with the jukebox internal speakers, I would wire them in "series-parallel" combinations. This was so I could present either a 4 ohm or 8 ohm or 16 ohm load to the amplifier. Series-parallel wiring can get complicated plus running tons of additional wires.

--- End quote ---
Thanks Ken. I agree.  I'm going to play it safe an run a series-parallel connection.  The runs to the two speakers are only 25' and 35' feet.  I'm going to use 14-gauge wire. 

Thoughts?

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