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Post by djhblue on Aug 7, 2021 12:36:31 GMT -7
Need some advice- I have a 16ohm Celestion Blue in my Z-Plus now, (which I had in a AC15). My question is: Im toying of addend a 1x12 cabinet to the amp for fun, using one of my existing speakers, which would include the original Z Emminence speaker, or a Cannibis Rex that I have. So do I add the connection to the 4ohm or the 8ohm input on the amp? I never could figure this "ohm" thing out. Thanks!
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Post by purpletele on Aug 7, 2021 12:50:19 GMT -7
Need some advice- I have a 16ohm Celestion Blue in my Z-Plus now, (which I had in a AC15). My question is: Im toying of addend a 1x12 cabinet to the amp for fun, using one of my existing speakers, which would include the original Z Emminence speaker, or a Cannibis Rex that I have. So do I add the connection to the 4ohm or the 8ohm input on the amp? I never could figure this "ohm" thing out. Thanks! djblue, If you are planning on using both speakers in the set up then you will need a Y connector. I bought mine from pcns here on the forum. Once you get the Y cable you plug your amp speaker lead into on of the legs of the Y, and then the other leg connects with the second speaker cabinet. The Impedance on the cabinet speaker should be 16 ohm as well. Two 16 Ohm speakers in parallel gives you an 8 ohm impedance, so you then plug the single lead of the Y into your 8 Ohm jack. I can send a photo if you need. Brian V
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Post by doctorice on Aug 7, 2021 13:24:04 GMT -7
This may be helpful, in addition to BV's note above.
You don't want to create a combined load (impedance / ohms) below 4. As you can see in the table below, this can occur when using a parallel connection. If both speakers are 16 ohms (15 ohms is sometimes marked on a speaker, but you can treat it as 16), you're good to go using the 8-ohm output on the amp as BV stated. You can also put an 8-ohm and 16-ohm in parallel. With a Z amp it's OK to plug that combined load (5.33 ohms) in the 4-ohm output on the amp.
Parallel connections are, in my experience, more frequently used than series. Todd (pcns) can set you up with either type of wiring in a Y-cable.
Speaker 1 Speaker 2 Parallel Series 8 4 2.67 12.00 8 8 4.00 16.00 8 16 5.33 24.00 4 4 2.00 8.00 4 16 3.20 20.00 16 16 8.00 32.00
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Post by daddyelmis (Greg) on Aug 7, 2021 18:25:32 GMT -7
[/quote]djblue, If you are planning on using both speakers in the set up then you will need a Y connector. I bought mine from pcns here on the forum. Once you get the Y cable you plug your amp speaker lead into on of the legs of the Y, and then the other leg connects with the second speaker cabinet. The Impedance on the cabinet speaker should be 16 ohm as well. Two 16 Ohm speakers in parallel gives you an 8 ohm impedance, so you then plug the single lead of the Y into your 8 Ohm jack. ;[/quote] This is exactly what I did with my ZPlus. I too have a Blue in the combo and added a 1x12 with a Z-12. It sounds fantastic. Picture of it in my avatar.
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Post by pcns on Aug 8, 2021 9:32:20 GMT -7
there are several flavors of Y cables available from here: procablesnsound.com/items/speaker-y-cables/list.htmfrom what you described a Power Y II may be what you want. Also, as a forum member you can use coupon code "zamps" and get a discount. Let me know if you have any questions. enjoy your tone quest, God bless, Todd
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Post by zpilot on Aug 9, 2021 6:11:43 GMT -7
On Z amps never use more than one speaker output jack at the same time. OK let me clarify that a little. If the output jacks are labeled with their appropriate impedance tap on the transformer (typical of MOST Z-amps) only use one at a time. The EMS however has paralleled jacks and an impedance switch so you can use both jacks at the same time, just like most old Marshalls. It is the only Z-amp like that that I am aware of.
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Post by djhblue on Aug 9, 2021 7:50:31 GMT -7
Thanks for the reply. Brian V, can you send a pic?
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Post by purpletele on Aug 10, 2021 7:46:43 GMT -7
Thanks for the reply. Brian V, can you send a pic? Yes, It will take me a little while, I'll have it today. BV
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Post by shonsolo on Aug 31, 2021 21:17:59 GMT -7
there are several flavors of Y cables available from here: procablesnsound.com/items/speaker-y-cables/list.htmfrom what you described a Power Y II may be what you want. Also, as a forum member you can use coupon code "zamps" and get a discount. Let me know if you have any questions. enjoy your tone quest, God bless, Todd I picked up a new to me Z recently. A cool little bonus, I found an additional PCNS Y cable included! My question is.. All of my speakers are 8 ohm except my lil ext cab. It’s a 16 ohm. Is it possible to connect the ext. cab to the Z28 using the Y cable? Should I just consider another 8ohm speaker ? (My cable is labeled “series”. The example above mentioned parallel) My 28 has the 4/8 ohm options. Thanks
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Post by premiumplus (Dave) on Sept 1, 2021 8:29:23 GMT -7
The only way to safely use a series speaker cable with your Z28 would be two 4 ohm speakers plugged into the 8 ohm amp output jack. If you use a series Y cable with a 16 ohm and an 8 ohm speaker the load on the amplifier will be 24 ohms, which is way too high. Whenever you use two speakers together they should be the same impedance. Otherwise they will not share power equally and one will be louder than the other. In all cases Ohm's law applies.
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Post by daddyelmis (Greg) on Sept 1, 2021 13:40:43 GMT -7
illustrating Dave's excellent reply, here a site where you can put in the amp's power output, and then specific number of speakers, ohm's of each, and whether wired in parallel or series. It then gives you the impedance the amp will see, and the power each speaker will see. This last bit illustrates Dave's point that the speakers will not share power equally and one will much louder than other. speakerimpedance.co.uk/?act=two_series&page=calculator
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Post by shonsolo on Sept 1, 2021 21:27:53 GMT -7
The only way to safely use a series speaker cable with your Z28 would be two 4 ohm speakers plugged into the 8 ohm amp output jack. Thanks for taking time to reply gentlemen!! I won’t be trying the series cable. Bit of a mystery why the previous owner would have it? This may shed some light on a few other things haha.
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