Speaker Impedance Too Low For Receiver

I have a receiver with impedance range 8-16 ohms, which came with 3 speakers.
I have 2 speakers from an old stereo I would also like to drive with this receiver.
However, the 2 speakers have an impedance of 6 ohms so they are very quiet in comparison to the other 3 speakers.

A little research has indicated that there are devices that perform impedance matching. However, I have not yet been able to find one.
I am not sure if I need a device to match the impedance of the receiver or a device to amplify the receiver signal for the 2 speakers.
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bejhanAsked:
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MereteCommented:
How big is the magnet on the 6 ohms? verses the 8-16 ohms.
What is the wiring width?
This amp how many watts does it put out?
This seems to me there is a problem with the speakers themselves or how you have positioned them from the amp possibly.
I don't have all the knowledge with the technical jargon but you should understand a bit more with the relationship between your amplifier watts output the wiring used and the speakers position..
To save time it's explained here nicely
clarify Impedance and Ohms, watts
It works something like this.
Two 8 ohms speakers wired in parallel (4 ohms total) would cause the amplifier to produce 200 watts. The amp produces 100 watts at 4 ohms. When the resistance is increased to 16 ohms, four times what it was rated the amplifier produces one fourth as many watts.
When combining speakers in a chain,  you can add them in parallel  to ensure that the resistance is what you want it to be.
Understanding Basic Electricity of your Amp and Speakers
http://www.activebass.com/a42--Understanding-Basic-Electricity-of-your-Amp-and-Speakers
The Interrelationship of Speakers and Amplifiers
http://www.gcaudio.com/resources/howtos/spkramp.html
cheers
Michael-BestCommented:
Lesser ohm speakers will have less volume and may overheat and damage the amp.
Also adding more speakers than the amp. was designed for may overheat and damage the amp.

Without giving specific details I can only suggest you try the two speakers wired in series to become a 12 ohm load on the amp.

Read:

Series, Parallel and Series/Parallel Resistance
 http://www.bcae1.com/spkrmlti.htm

Speaker Impedance Explained - Ohms
 http://www.prestonelectronics.com/audio/Impedance.htm
bejhanAuthor Commented:
Sorry, I should've provided more information.

The receiver is a Sony STR-DE697, which supports up to a 7.1 speaker configuration and provides 100 watts per channel.

I have the 3 "good" speakers hooked up as front left, right, and center.
They are have an impedance of 8 ohms and are rated for 25-100 watts.

In additions to the 7.1 hookups, the receiver also has additional front left and right speaker connections, which I've used to hook up the 2 "bad" speakers.
These speakers have an impedance of 6 ohms and are rated for 15 watts.

You've suggested to wire the speakers differently to achieve the desired impedance. I suppose I would have to use the same speaker channel to achieve this, rather than using two separate ones as I am currently. I'm also now wondering if the speakers are not working well because they cannot handle the higher wattage.
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MereteCommented:
Could be simple things such as 7.1 stereo setting with the AMP is no good if your only playing mp3 with 16 bits.
If you play a true surround sound the stereo should automatically split the sound to the various front rear and mid.\A sub woofer picks up these high frequencies. If these extra speakers are added to the same input as your front or rear maybe your amp cannot push the sound out correctly.
It's difficult to offer correct advise with out seeing your entire setup.
Looking at the semantics here I get the impression everything has dedicated sockets.
https://ca.en.kb.sony.com/app/answers/detail/a_id/30194/c/65,67/p/41901,43145,43976/
How to troubleshoot no sound coming from an active subwoofer.
https://ca.en.kb.sony.com/app/answers/detail/a_id/39055/c/65,67/p/41901,43145,43976/
On my stereo pioneer AMP there is a sound test on my remote control which plays a noise to confirm that all 5 speakers function,
 I can also modify the level of volume from the front to rear and center Sansui speakers.
I have the option for surround stereo sound, pro logic sound and others. if these speakers your adding the magnets inside don't match with the default speakers size I'd skip them as they probably just wont function right. The magnets really do play an important part, do these extra speakers have a sub woofer?
cheers
MereteCommented:
Could be simple things such as 7.1 stereo setting with the AMP is no good if your only playing mp3 with 16 bits.
If you play a true surround sound the stereo should automatically split the sound to the various front center rear.\A sub woofer picks up these high frequencies. If these extra speakers are added to the same input as your front or rear maybe your amp cannot push the sound out correctly.
It's difficult to offer correct advise with out seeing your entire setup.
Looking at the semantics here I get the impression everything has dedicated sockets.
https://ca.en.kb.sony.com/app/answers/detail/a_id/30194/c/65,67/p/41901,43145,43976/
How to troubleshoot no sound coming from an active subwoofer.
https://ca.en.kb.sony.com/app/answers/detail/a_id/39055/c/65,67/p/41901,43145,43976/
On my stereo pioneer AMP there is a sound test on my remote control which plays a noise to confirm that all 5 speakers function,
 I can also modify the level of volume from the front to rear and center Sansui speakers.
I have the option for surround stereo sound, pro logic sound and others. if these speakers your adding the magnets inside don't match with the default speakers size I'd skip them as they probably just wont function right. The magnets really do play an important part, do these extra speakers have a sub woofer?
cheers
bejhanAuthor Commented:
Could be simple things such as 7.1 stereo setting with the AMP is no good if your only playing mp3 with 16 bits.
If you play a true surround sound the stereo should automatically split the sound to the various front center rear.
The receiver has AFD mode that allows for 2 channel input to be distributed across 7.1 channels.
I am using this mode, configured for 3.1 channels (front left, right, and center + subwoofer).

If these extra speakers are added to the same input as your front or rear maybe your amp cannot push the sound out correctly.
The extra speakers are not added to the same input as the other front speakers. Instead they are connected to a set of "additional front" inputs.

if these speakers your adding the magnets inside don't match with the default speakers size I'd skip them as they probably just wont function right.
How do I determine magnet size?

do these extra speakers have a sub woofer?
Yes, they each have a built in subwoofer, with a separate connection. I've connected these to the receiver's subwoofer channel.

The below picture shows the receiver's indication of 3.1 channels (L, C, R, and SW) and indication that both sets of front speakers are active (SP A and SP B).
3.1 Channels
The below picture shows how I have my speakers connected. Each unused channel is marked with red X.
Speaker Connections
Michael-BestCommented:
"These speakers have an impedance of 6 ohms and are rated for 15 watts."

These are inferior speakers compared to your other speakers and amp.

I suggest you forget about them and buy and hook-up 2 speakers similar or better than your  present speakers.

"I have the 3 "good" speakers hooked up as front left, right, and center.
They are have an impedance of 8 ohms and are rated for 25-100 watts
."

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bejhanAuthor Commented:
I figured as much, I just wanted to get some expert feedback before giving up on them.
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