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12-02-2018, 07:06 PM
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#1
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Kanadian Kamper
Join Date: Sep 2010
Location: Southern Ontario
Posts: 8,170
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Stereo speaker questions
I have access to a home stereo system, with an amplifier which comes with two 3 ohm speakers connected by two wires, as it is designed. These speakers contain micro tweeters, tweeters, mid range and bass chamber. The amp boasts 120 watt power output.
I also have two speakers from another dead stereo system which are driven by four wires as they were designed. The speakers contain tweeters, mid range and bass chamber. The four wires are labled to be connected to both 8 ohm (high) and 6 ohm (low).
My impression is that the second set of speakers produced better sound, but I’m not sure IF or HOW I could connect them in place of the provided speakers to this new home.
Qualified answers appreciated.
__________________
Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain
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12-02-2018, 10:07 PM
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#2
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Senior Member
Join Date: Jan 2018
Location: Astatula, FL
Posts: 193
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Odds are the first set has a crossover built into the speaker thus only two wires (signal and ground). The second set has a signal lead for each speaker range and a common ground. You'll need a crossover somewhere before the speakers to separate the signal into the various ranges.
As for the impedance mismatch, ideally you should attempt to match the speakers to the amp. That said, connecting 8 ohm speakers to 3 ohm amp should be okay for most circumstances with two caveats: the 100w spec on the amp will wind up in the 35-40w range at the 8 ohm speakers, you may experience some distortion near max volume.
Connecting 3-4 ohm speakers to an 8 ohm signal without matching impedance via a transformer, L-pad, or creative wiring could damage the speaker as it will be overdriven. At best it will likely be distorted.
__________________
Mark Wilson
No trees were harmed while sending this message;
however, a rather large number of electrons were terribly inconvenienced.
TT: 2018 Surveyor 243RBS TV:2019 F-250 XLT 6.2L 4x4 Crew Cab
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12-03-2018, 05:53 PM
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#3
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Kanadian Kamper
Join Date: Sep 2010
Location: Southern Ontario
Posts: 8,170
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Thanks Mark.
I’d like to discuss in detail further, but we move tomorrow
Can I talk some more when we get settled later?
__________________
Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain
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12-07-2018, 07:51 PM
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#4
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Kanadian Kamper
Join Date: Sep 2010
Location: Southern Ontario
Posts: 8,170
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Mark....
Here’s a picture of how/where the older speakers were connected to the amp. The red, black, blue, white wires are hard wired into the interior of the speakers.
Now, I only have two connection terminals for each speaker on the amp.
Can I use these older speakers with my newer amp at all? If so, what wires where?
Thanks.
__________________
Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain
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12-09-2018, 07:51 PM
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#5
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Senior Member
Join Date: Jan 2018
Location: Astatula, FL
Posts: 193
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In general, connecting 3 ohm (are you sure they aren't 4 ohm?) speakers to an amp designed for an 8 ohm load is a Bad Thing(tm). If the amp has a protection circuit, it will shut down. If not, it will probably sound good... for a short while after which the amp will be toast. I mis-spoke about the effect in the earlier post. Matching impedance would be involved and probably not economical.
The options are:[LIST][*]find another amp designed for 4 ohms either with an internal crossover or add an external crossover or[*]find some better 8 ohm speakers with or without an internal passive crossover or[*]use the speakers that came with the amp.
I wish I had better news.
__________________
Mark Wilson
No trees were harmed while sending this message;
however, a rather large number of electrons were terribly inconvenienced.
TT: 2018 Surveyor 243RBS TV:2019 F-250 XLT 6.2L 4x4 Crew Cab
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