Adding Speakers To A Two Speaker Stereo? - Chevelle Tech
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post #1 of 12 (permalink) Old Dec 19th, 15, 6:09 PM Thread Starter
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Adding Speakers To A Two Speaker Stereo?

My '75 Corvette has the factory stereo, which plays thru two 10 ohm 4x6 speakers in the kick panels. There are only wires for two speakers. Can I run wires from the two front speakers and add two more to the back and still have it sound good? If so, will I need two more 10 ohm speakers, or can common 4 ohm speakers be used since they are feeding thru the front 10 ohm speakers first? The fronts are new 10 ohm replacements from www.turnswitch.com. I don't want to alter the factory stuff in any way. Thanks!

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post #2 of 12 (permalink) Old Dec 19th, 15, 7:22 PM
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Re: Adding Speakers To A Two Speaker Stereo?

The radio is designed to work with a 10 ohm speaker or load. If you connect up another set of 10 ohm speakers to the other ones, it can be done one of two ways which creates issues. One way to wire up a second set is in a parallel connection but doing so reduces the ohms or load to 5 ohms which the radio will not like. The other way to wire the second set is by a series connection and doing this the load the radio would see would be 20 ohms which it might like but with the higher load or resistance, there will be less power coming out of the radio. If with just the two speakers seeing 10 ohms on the 2 speakers you might have the volume up to let's say halfway and if the radio would like the series wiring with it seeing 20 ohms, then to get the same volume you would need to crank the volume up further but at some point the distortion level may be more audible.

I have wired up speakers through the years in series but for some reason they just sound funky to me and I think the reasoning is the first speaker gets the original sound and then this gets colored for lack of a better word from it's speaker cone going in and out and this affects what the second speaker gets.

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post #3 of 12 (permalink) Old Dec 20th, 15, 11:00 AM Thread Starter
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Re: Adding Speakers To A Two Speaker Stereo?

Sounds like its probably not worth spending the money to try it. If it bothers me too much the way it is, I just need to upgrade the whole thing. Thanks,Jim.

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post #4 of 12 (permalink) Old Dec 20th, 15, 11:26 AM
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Re: Adding Speakers To A Two Speaker Stereo?

I've done a few Corvette's through the years but maybe look at how well the existing speakers are installed.
Some speakers get mounted by some screws around the edge to hold it in place but if the speaker is not on some type of baffle, then the lows and lower mid-range is affected as basically the speaker is flapping in the breeze.
If you have a full range speaker and have it just sitting there, the sound eminating off of the back of the speaker interferes with the sound coming off of the front of the speaker. If you were to then take a 2' x 2' piece of any solid material and then cut out a tightly fitting hole for the speaker to mount in the middle of this material and then mount and wire up the speaker it should sound better as now the sound eminating off of the back of the speaker has a longer path to come around to the front side and this then helps the speaker sound better.
On some speaker mounting schemes I've added little pieces of sound deadener sheet material around the edges of the speaker to help create a baffle and on some installs I've added foam weatherstrip around the perimeter edge of the speaker to where when the kick panel or door panel is put back in place, it creates a seal.

Here is a pictures of a speaker in a kick panel that around it has been sealed:



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Last edited by Jim Streib; Dec 20th, 15 at 2:48 PM.
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post #5 of 12 (permalink) Old Dec 20th, 15, 1:02 PM
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Re: Adding Speakers To A Two Speaker Stereo?

Couldn't you just add a "booster" to the output side of the deck. Usually these have provisions for 4 speakers while just needing 2 channel input. Don't think they make them anymore but they're available used. This is the way I wired my pioneer TP900, thinking it was a 40 watt booster. It is quite sensitive on the volume, but sounds much better than just the deck alone.
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post #6 of 12 (permalink) Old Dec 20th, 15, 3:13 PM
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Re: Adding Speakers To A Two Speaker Stereo?

Quote:
Originally Posted by cheveslakr View Post
Couldn't you just add a "booster" to the output side of the deck. Usually these have provisions for 4 speakers while just needing 2 channel input. Don't think they make them anymore but they're available used. This is the way I wired my pioneer TP900, thinking it was a 40 watt booster. It is quite sensitive on the volume, but sounds much better than just the deck alone.
I had to look up what the TP900 was and it looks like the old school underdash radio with 8-track (cool). I saw a picture of the TP900 and I wonder how you have that wired to an original radio ?. This radio/8-track player does have a cord on it which might be an aux input but if it is and it has too much signal going into it, from something like an original radio, then the volume control will be sensitive. You may have to use an adjustable input adaptor to reduce the level into the input so things are better matched to each other.

Adding a booster is an option and I think Alpine and maybe Kenwood sell a really small 4 channel amplifier that on the input side you could tie the 4 channel input down to a 2 channel input and still have 4 individual outputs for 4 speakers. You would not be able to control the front to rear fade but if there are seperate gains for the front and rear outputs, then once adjusted you would leave them alone.

http://www.kenwood.com/usa/car/ampli...1804/spec.html

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post #7 of 12 (permalink) Old Dec 20th, 15, 3:30 PM
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Re: Adding Speakers To A Two Speaker Stereo?

I don't have it wired to an original radio. Just giving another like comparison.
Thanx for the analysis.
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post #8 of 12 (permalink) Old Dec 20th, 15, 8:01 PM
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Re: Adding Speakers To A Two Speaker Stereo?

Quote:
Originally Posted by cheveslakr View Post
I don't have it wired to an original radio. Just giving another like comparison.
Thanx for the analysis.
I've been installing car audio since the late 70's and vaguely remember those underdash units. I think it's neat they are still out there and working for people to enjoy.

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post #9 of 12 (permalink) Old Dec 20th, 15, 8:28 PM
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Re: Adding Speakers To A Two Speaker Stereo?

These are a little surprising when you add a booster and the right speakers. It's always a challenge to fit them into a stock application, ie, rear package tray, front speaker area, and under dash cavities.
Thanx Jim, for your expertise, and here's a reminder...

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post #10 of 12 (permalink) Old Dec 20th, 15, 9:19 PM Thread Starter
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Re: Adding Speakers To A Two Speaker Stereo?

I remember those units! The "rich kids" had them in their cars. On the Corvette, I did line the cavity in the kick panel with a dynamat type stuff, and the speaker barely fits the opening. The sound is not bad at all, I was just looking for a little more. If I wanted something different, I'd send the radio to Lectric Limited for an internal conversion so as to keep the stock look, then add speakers. Thanks for the advice.

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post #11 of 12 (permalink) Old Dec 21st, 15, 10:58 AM
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Re: Adding Speakers To A Two Speaker Stereo?

You could also use a LOC (line output converter) thatíll change the 2 existing high level signals into low level, then run a small 4 channel amp to each of the speakers... This method would also allow you to retain the factory look and still have a much better amplified signal.
Side note (because of the 2 into 4 configuration you would still only have balance OR fader, not both)

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post #12 of 12 (permalink) Old Dec 21st, 15, 12:22 PM
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Re: Adding Speakers To A Two Speaker Stereo?

You could swap out the 10ohm units with 4ohm units and run them in series, this will give you 8ohms and should not be really taxing on the amp. You can add a front to rear fader also.

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