can you piggy back a 4 ohm onto an 8 ohm cab? would that give me 6 ohms impedance? is there such a thing? would it work? thanks.
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4ohm and 8ohm cabs
- Thread starter michaelsin
- Start date
Rick Auricchio
Registered Bass Offender
Connecting them in parallel as you indicate would result in 2.67 ohms. You don't add the impedance, you have to calculate (cab1 * cab 2) / (cab1 + cab2).
That's (4 * 8) / (4 + 8) or 2.67.
If your amp cannot handle a load below 4 ohms, don't do it!
That's (4 * 8) / (4 + 8) or 2.67.
If your amp cannot handle a load below 4 ohms, don't do it!
Rick Auricchio
Registered Bass Offender
Another note: The 4-ohm cab will receive 2/3 of the amp's power, and the 8-ohm cab will get 1/3. Be careful with power to avoid blowing the 4.
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+1
and if it can rune to 2 ohms you will need double the speakers in the 4 ohm cab so each speaker gets the same power. i.e. a 112 8ohm and a 210 4 ohm... or a 210 8 ohm and a 410 4 ohm
and if it can rune to 2 ohms you will need double the speakers in the 4 ohm cab so each speaker gets the same power. i.e. a 112 8ohm and a 210 4 ohm... or a 210 8 ohm and a 410 4 ohm
Wait a second...
If you connect both cabs to the amp (parallel) then the above applies.
If you connect one cab to the amp and the second cab to the first cab, they will be connected in series, running at 12ohms.
If you connect both cabs to the amp (parallel) then the above applies.
If you connect one cab to the amp and the second cab to the first cab, they will be connected in series, running at 12ohms.
billfitzmaurice
Commercial User
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Only if they are equipped with jacks specifically wired to do so, which is extremely unlikely unless you installed and wired them yourself.
Thanks a lot!
So in most of the cases I have 2 cabinets connected to an amp, no matter if they are connected directly to the amp or daisy chained, they will be in parallel?
I always thought the daisy-chain would be wired in series!
Thanks a lot for correcting me!
So in most of the cases I have 2 cabinets connected to an amp, no matter if they are connected directly to the amp or daisy chained, they will be in parallel?
I always thought the daisy-chain would be wired in series!
Thanks a lot for correcting me!
Considering an amp with 2 connections for cabinets, what would be the advantages/disadvantages of connecting 1 cabinet to each connection on the amp or connect just one and daisy chain the other?
Thanks again!
Thanks again!
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mikeboth
The last thing you'll ever see
If you are keen, and your 4 ohm cab has more than one speaker, you may be able to re-wire the cab internally so it becomes 16 ohm cab and THEN run it in parallel with the other 8 ohm cab. This is what I did with my Bigfoot - originally it had 2 8ohm 12" speakers in parallel, but I rewired these in series so I could then use the resultant 16ohm cab in parallel with my 8ohm Big Ben; my amp has a switch for driving 4 or 8 ohm loads, so I set it to 4. The only 'problem' here is that the Big Foot gets proportionally less power, however - over all - I think it's worth it as the sound seems much fuller. Less watts into more speaker surface area *seems* to be much more important that running more watts into less speaker surface area...
Ive also got a question. If I run my 4 ohm cab from one of the outputs on the head, can I daisy chain 2 8 ohm cabs and get a 2 ohm load?
Rick Auricchio
Registered Bass Offender
Yes. The cabinet jacks will simply wire daisy-chain in parallel (unless someone rewired them).
A 4 and 8 and 8 in parallel will give you a 2-ohm load.
The 4 will get half the total power; each 8 will get 25%. Be careful not to overpower the 4.
A 4 and 8 and 8 in parallel will give you a 2-ohm load.
The 4 will get half the total power; each 8 will get 25%. Be careful not to overpower the 4.
+1
If your amp is not rated for below 4 ohms, you may blow it up or burn it out rather quickly!
so if an amp can handle a 2ohm load is it okay to run 2-4ohm cabs in parallel with the amp set for a 4 ohm output? as 2 ohms will be the total load with equal speakers in each cab according to the formula. or should the amp be set to an 8ohm output?
Check with the manufacturer of your amp to ASSURE you can run it at 2 ohms. Otherwise, send your amp to the grave....
ya its a traynor yba 200, it can handle 2ohms. about to get some quality speakers so im trying to figure this whole impedance stuff.
Rick Auricchio
Registered Bass Offender
Since the Traynor is all tubes, you have to set the impedance selector to match the final load of your speakers. If you're going to have a 2-ohm load, set the amp to match.
