GL1100 Sound System Project


Information and questions on GL1100 Goldwings (1980-1983)
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81t
Posts: 4
Joined: Thu Aug 06, 2015 7:13 pm
Location: Louisville, KY
Motorcycle: 1981 GL1100

GL1100 Sound System Project

Postby 81t » Tue Aug 25, 2015 8:43 pm



Hey guys, I've been prowlin' around these forums for about a month now since I got my 81 GL1100. This is my first post and forgive me if this query has been answered previously. I've had no luck searching in the forums. I want to tell you guys what I intend to do and then follow up with a crucial question about it, so here goes...

Like the title says I've started a sound system project on my Goldwing. I have the fully dressed Vetter fairing and hard bags. (I'll post some photos tomorrow) I just replaced the stock tape deck and speakers with a modern marine stereo and 4" drivers. They sound fine but not nearly loud enough to hear when at speed.

I've come to the conclusion that it's now time to add an amplifier. I've settled on this......http://www.pioneerelectronics.com/PUSA/ ... s/GM-A4604

Notice that it's a 4 channel amplifier, the reason being is that I intend to add two more speakers on my rear hard bags.

Once that's all said and done, I would like to add a subwoofer, (the exact placement yet to be determined) with it's own dedicated mono amplifier.

That's what I want to do, my project in full, now my question.......

Will my stator be able to handle all of this load and still be able to charge the battery? My intentions are to wire everything to the battery with fuses and even a switch for the stereo. How much load can a typical 12v battery take? I just need to know what it's gonna take, if it's even possible.

Also, this is a great community and I'm proud to be (barely) a part of it. :lol:



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WingAdmin
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Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: GL1100 Sound System Project

Postby WingAdmin » Tue Aug 25, 2015 9:50 pm

All told, you have between 70 - 90 watts (5 - 6.5 amps) of excess juice to play with, and that's at cruising RPM (i.e. > 3500 RPM). The bike actually runs off the battery at idle, as it doesn't produce enough power to charge the battery at low engine speeds.

That said, that availability is continuous draw, like a light. A radio/amplifier draws in peaks, depending on the music being listened to. The subwoofer (and mono amp) will draw more than anything else.

You can free up some power by doing some other modifications. Replace the headlight with a HID bulb and free up 20 watts. Or, replace the headlight with a LED bulb and free up 37 watts.

Replacing the brake front running lights with LEDs can free up 12 more watts.

So assuming you go all LED, that's 49 watts freed up, so your overall available power is between 119 - 139 watts (8.6 - 10 amps).

81t
Posts: 4
Joined: Thu Aug 06, 2015 7:13 pm
Location: Louisville, KY
Motorcycle: 1981 GL1100

Re: GL1100 Sound System Project

Postby 81t » Tue Aug 25, 2015 10:59 pm

You're amazing WingAdmin, thanks for the reply.....

So when my stereo outputs 50x4 watts. that's 200 watts from my stator? If so I'm screwed :?

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WingAdmin
Site Admin
Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: GL1100 Sound System Project

Postby WingAdmin » Wed Aug 26, 2015 8:23 am

81t wrote:You're amazing WingAdmin, thanks for the reply.....

So when my stereo outputs 50x4 watts. that's 200 watts from my stator? If so I'm screwed :?


That's saying that your stereo is CAPABLE of putting 50x4 watts out, to the speakers. It doesn't mean it is consuming that power, all of the time. An amplifier is rated in RMS, which is root mean square - not the same as continuous output. Basically, you can't compare audio watts to DC watts you find in your car. You could

If you were to play a very low frequency sine wave, turn it up to maximum distortion, into speakers that were of low enough impedance, it might put that kind of power out - but again, in RMS, not continuous. Most audio output specifications for stereos tell you only the "watts" and completely omit the distortion, or "THD" (total harmonic distortion) numbers.

Your stereo may put out 50 watts per channel, but that might be at 1% THD, or even 5% THD. To put this into perspective, anything above 0.1% THD sounds absolutely terrible. So your amplifier may put out a more realistic 10 watts per channel at 0.1% THD, but 50 watts per channel at 2% THD, which you would NEVER play, because it sounds so terrible.

And even when it was putting out 10 watts per channel, that is not continuous - it might have peaks of 10 watts per channel during the beat of the bass drum, but for most of the time, it's putting out a tiny fraction of that.

Incidentally, running an amplifier so high that it gets into significant distortion (i.e. > 1%) is what "blows" speakers. When you push the gain an amplifier beyond what it is capable of producing, it drives the signal into clipping, which causes distortion - and sends more and more DC to the speaker coils, which melts the coils. This is why an amplifier rated for 40 watts is quite capable of blowing a speaker rated for 100 watts.




81t
Posts: 4
Joined: Thu Aug 06, 2015 7:13 pm
Location: Louisville, KY
Motorcycle: 1981 GL1100

Re: GL1100 Sound System Project

Postby 81t » Fri Aug 28, 2015 10:24 am

This is wonderful news, thank you very much. I've decided to delve in and do the poorboy alternator conversion. I'm gonna get crazy with it, it's chevy Pontiac 3 wire 120a alternator. :o :lol:

I'm gonna hook up soooo much stuff. I'm not doing any of this for practical reasons, just to learn......and to feel my subwoofer when I'm on the interstate :twisted:

I know there's already walkthroughs on it but I'm going to post my project on here if that's ok.

User avatar
WingAdmin
Site Admin
Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: GL1100 Sound System Project

Postby WingAdmin » Fri Aug 28, 2015 12:04 pm

81t wrote:This is wonderful news, thank you very much. I've decided to delve in and do the poorboy alternator conversion. I'm gonna get crazy with it, it's chevy Pontiac 3 wire 120a alternator. :o :lol:

I'm gonna hook up soooo much stuff. I'm not doing any of this for practical reasons, just to learn......and to feel my subwoofer when I'm on the interstate :twisted:

I know there's already walkthroughs on it but I'm going to post my project on here if that's ok.


Absolutely! We love project postings here!

81t
Posts: 4
Joined: Thu Aug 06, 2015 7:13 pm
Location: Louisville, KY
Motorcycle: 1981 GL1100

Re: GL1100 Sound System Project

Postby 81t » Fri Aug 28, 2015 2:51 pm

Sounds awesome, I'll start posting as soon as the alternator arrives!!!!! 8-)




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