Amplifiers. replacing the speaker

Posted by Redbelly on October 12, 2012 at 7:43am

I bought an old AMP (240 V -A/C---- Australia.). I measured the output from the transformer and this was 15 V. THe old speaker is 8 inch and 8 ohm. I want to put it in a new smaller box . (with better acoustics) with a 4 inch or smaller speaker. I have calculater the output at 30 watts. Is this correct and would I buy any speaker which was 8 ohm and 30 watt. If not what should I use

Thanks

Noosavilleblues.

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Replies

  • Redbelly October 15, 2012 at 5:17am

    I hope this post has the photo

    DSCF0002.JPG

    • Servaas (Der Groovemeister) > Redbelly October 15, 2012 at 9:08am

      It's a transistor amp. So you can safely use any of the speakers you have. However it will probably sound best with a speaker closest to 8 ohm. Just try them all, they will all sound different and some may sound louder than others. Btw. this amp's output is not more than 10 watts (by the looks of it). Probably around 5!

    • Redbelly > Servaas (Der Groovemeister) October 15, 2012 at 4:46pm

      Thank you

      Mike

  • Redbelly October 12, 2012 at 9:43pm

    Thanks to Professor  google !!!!

    • Servaas (Der Groovemeister) > Redbelly October 13, 2012 at 4:21pm

      Can you post a picture of the amp inside?

    • Redbelly > Servaas (Der Groovemeister) October 13, 2012 at 6:41pm

      Yes I will post a picture. Can I replace that 8 ohm speaker with a speaker either 4 or 8 inch which the ohms are unknown. The speakers were from a large sterio unit. All the information on the boxes was maximum 30 watts

    • Redbelly > Redbelly October 15, 2012 at 5:02am

      The old sterio speakers I have are  1 x 6 inch- 4 ohm, 2 x 4 inch- 7.3 ohm, 2 x 8 inch- 6.7 ohm, 2 x 2.5 inch-  7.2ohm.can I use any of these to replace the old 8 inch 8 ohm speaker. the photos are of the guts of the amp

      DSCF0001.JPG

      DSCF0002.JPG

    • Servaas (Der Groovemeister) > Redbelly October 14, 2012 at 1:27pm

      You can measure the resistance of the speaker with a digital multimeter. It's never exactly 4, 8 or 16 ohms, but you can round it off to the nearest of the 3. A transistor amp will not mind so much what the speaker impedance (ohmage) is. A tube amp however can be destroyed with a wrong impedance speaker!

  • Servaas (Der Groovemeister) October 12, 2012 at 9:17am

    A 4 inch speaker will work, but i think a bigger speaker would sound much better! And if it's a tube amp i would go for a higher wattage speaker.

    • Redbelly > Servaas (Der Groovemeister) October 12, 2012 at 2:45pm

        I am a novice at all this, what is a tube amp

      Thanks

This reply was deleted.