iMac 20" 2017 speakers' cable identification

Question

iMac Intel 27インチ Retina 5Kディスプレイ (Mid 2017)

モデル番号A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5もしくは3.8 GHz Core i5もしくは4.2 GHz Core i7 Kaby Lakeプロセッサ (ID iMac18,3) / Retina 5Kディスプレイ。システムは類似しているため、修理ガイドについては旧モデルのiMac Intel 27インチ Retina 5Kディスプレイ (Late 2014 & 2015) を参照してください。

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Jack @kajack

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投稿日: 2022年7月20日

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iMac 20" 2017 speakers' cable identification

Hi all,

I would use iMac's speakers with 2.1 amplifier (got the parameter from the other thread: 8 ohm, 2x15W+10W). The only thing which stops me with that is how to connect cables properly. Well I could open each speaker case but it is glued and do not want to damage them. There are two speakers (left and Right) and two subwoofers (L & R). Anyone knows which cable is dedicated to what? I could not find any information on internet.The speakers are the same for 27" iMac 2015-2017 and even mid 2019.

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Jack @kajack

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投稿日: 2022年7月30日

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I've found a few way to test speaker polarity but the best is with battery. Please see below or click link.

If your system is already wired and you are able to pass an audio signal from input to output, you can test speaker polarity using a smartphone app.

I recommend the Studio Six Speaker Pop App. It works by connecting the audio output of your smartphone to the input of your system. Then place the microphone of your smartphone in front of the speaker you want to test. The app will send a positive impulse out to the system and measure the polarity of the sound coming out of the speakers.

If you’re looking for a quick, free way to test speaker polarity, you can do it using the following method:

For this technique, you will need a 9V battery. DO NOT touch the terminals of the battery to the speaker for an extended period of time!

Place one speaker wire to the positive (+) terminal of the battery.
Place the other speaker wire to the negative (-) terminal of the battery.
Notice which way the speaker moves as you make this connection.
1. If the speaker moves outward, then the speaker wire connected to the positive (+) terminal of the battery is the positive (+) wire.
2. If the speaker moves inward, then the speaker wire connected to the negative (-) terminal of the battery is the positive (+) wire.

This video clip shows what you are looking for when you apply the battery to the speaker wires:

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@kajack - Neat Trick!

Dan さんによる2022年7月30日

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Dan @danj 評価: 481千 Self employed contract worker 35 330 971 · Answer 1 · 2022-07-21T05:18:48-07:00

Dan @danj

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投稿日: 2022年7月21日

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Well, the good news is the speakers are wired at the connector in the speaker pairs so its just a matter to isolate which pair of wires go the given speaker main or subwoofer.

You'll need to locate the schematics and boardview drawings for your system board number is 820-01236. You do need both first to ID the connector to then locate within the schematics and then figure out what pins on the logic board relate to which speaker.