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Compound9
post May 26 2009, 12:47 PM
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here's a quick technical question - whats the difference?

i read in my amp manual that running my amp on a 16ohm load puts more stress on my amp. is 16ohm louder than 8ohm or 4 ohm?

does the impediance affect the tone at all? by alot??

basic but i just dont know the answer.
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kjutte
post May 26 2009, 08:16 PM
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QUOTE (Compound9 @ May 26 2009, 01:47 PM) *
here's a quick technical question - whats the difference?

i read in my amp manual that running my amp on a 16ohm load puts more stress on my amp. is 16ohm louder than 8ohm or 4 ohm?

does the impediance affect the tone at all? by alot??

basic but i just dont know the answer.


High impedance means less ampage, basically.
If your amp is built for 16ohm speakers, then putting a 4 ohm speaker on it will blow the fuse, because a 4 ohm speaker sucks 3 times more power out of it.

This post has been edited by kjutte: May 28 2009, 08:18 AM
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Compound9
post May 27 2009, 08:24 AM
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QUOTE (kjutte @ May 26 2009, 07:16 PM) *
High impedance means less ampage, basically.
If your amp is built for 16ohm speakers, then putting a 4 ohm speaker on it will blow the fuse, because a 4 ohm speaker sucks 3 times more power out of it.

I am not a pro on the subject, let's wait for Cockburn to reply!


oh yeah, i understand that, but say your amp is built for 16, 8, and 4ohms. and your speaker could play 16, 8, and 4ohms. which would be the better one to choose? whats the difference?
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Ivan Milenkovic
post May 27 2009, 11:59 AM
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QUOTE (Compound9 @ May 27 2009, 09:24 AM) *
oh yeah, i understand that, but say your amp is built for 16, 8, and 4ohms. and your speaker could play 16, 8, and 4ohms. which would be the better one to choose? whats the difference?

Speaker cannot accept all three loads: 16, 8 or 4 Ohms, speakers have fixed impedance value - it's 16 or 8 or 4Ohms for the speaker. Cabinets on the other hand can often have a feature to switch between loads.
Here's a useful article on impedance and voltage:
http://www.prestonelectronics.com/audio/Impedance.htm

This post has been edited by Ivan Milenkovic: May 27 2009, 12:00 PM


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Compound9
post May 27 2009, 04:31 PM
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QUOTE (Ivan Milenkovic @ May 27 2009, 10:59 AM) *
Speaker cannot accept all three loads: 16, 8 or 4 Ohms, speakers have fixed impedance value - it's 16 or 8 or 4Ohms for the speaker. Cabinets on the other hand can often have a feature to switch between loads.
Here's a useful article on impedance and voltage:
http://www.prestonelectronics.com/audio/Impedance.htm


thanks for the article, it was a good read, quite technical. so am i to understand that there is no difference in tone or volume between the different impediance options?? :s
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ZakkWylde
post May 27 2009, 04:58 PM
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After what I heard it's best to run the amp on the highet impedance it offers - the higher the impedance the lower the stress for the tubes and stuff. I run my amp with the 16 ohms out into the 160hms in of my cab to get the longest life out of my amp...


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kjutte
post May 28 2009, 07:54 AM
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QUOTE (ZakkWylde @ May 27 2009, 05:58 PM) *
After what I heard it's best to run the amp on the highet impedance it offers - the higher the impedance the lower the stress for the tubes and stuff. I run my amp with the 16 ohms out into the 160hms in of my cab to get the longest life out of my amp...


Speaking strictly volume, low impedance speakers will absorb the most current and thus be driven the most. However, this will put a huge stress on your amplifier. You will never see an amp built for 1 impedance speakers (Never may be excessive; IDK.)

However, having a too high impedance will cut the current by too much, and then you would need a speaker with matching needs, meaning, less power less volume.

Basically the best solution is 'in between'.

"Since it's very hard to know and understand the implications of the impedance characteristics of a speaker, and because you never know what the future may bring, your best bet is to get a receiver or amplifier that is capable of driving a 4-Ohm load. It will cost you more but it will be the better long-term investment. When shopping for an amp or receiver, do your homework. No impulse purchases please."

http://www.hometoys.com/htinews/feb04/arti...k/impedence.htm

This post has been edited by kjutte: May 28 2009, 08:14 AM
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Compound9
post May 28 2009, 09:07 AM
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QUOTE (ZakkWylde @ May 27 2009, 03:58 PM) *
After what I heard it's best to run the amp on the highet impedance it offers - the higher the impedance the lower the stress for the tubes and stuff. I run my amp with the 16 ohms out into the 160hms in of my cab to get the longest life out of my amp...


i was once told that you get a better tone from 16ohm, but more volume with an 8ohm. unfortunately, my cab is 16ohm only, so i dont get a choice. but reading the article just above, i think i need to convert to an 8ohm for a good balance in performance and life.
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Ivan Milenkovic
post May 28 2009, 09:29 AM
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QUOTE (Compound9 @ May 27 2009, 05:31 PM) *
thanks for the article, it was a good read, quite technical. so am i to understand that there is no difference in tone or volume between the different impediance options?? :s

As long as you match the impedance at amp with that on the cab/speaker it will be OK.


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kjutte
post May 28 2009, 10:09 AM
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QUOTE (Ivan Milenkovic @ May 28 2009, 10:29 AM) *
As long as you match the impedance at amp with that on the cab/speaker it will be OK.

+1
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Compound9
post May 28 2009, 11:36 AM
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QUOTE (Ivan Milenkovic @ May 28 2009, 08:29 AM) *
As long as you match the impedance at amp with that on the cab/speaker it will be OK.


oh yeah, i know that,. Im just trying to weigh up whether i should sell my 16ohm cabinet and buy a 8ohm cabinet.
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kjutte
post May 28 2009, 01:27 PM
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QUOTE (Compound9 @ May 28 2009, 12:36 PM) *
oh yeah, i know that,. Im just trying to weigh up whether i should sell my 16ohm cabinet and buy a 8ohm cabinet.


If it sounds good, it is good. And an 8 cab will ruin the head if it can't bear 8 ohm load, as you may have understood.
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