Help please with speaker wiring .

I have speakers with four, 4 ohm ten inch woofers in each of my studio labs SL550 s . ( i have 4 of them ). I was wondering if anyone knew or knows the best way to wire these to put the least strain on my amps . ?
 

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You have a choice of a "figure 8" connection giving 4 ohms, or all in series for 16 ohms.
The 16 ohms would be the least amplifier strain by far, but also have much less power for each driver.
The 16 ohm connection would not be suitable in most cases, so use the "figure 8" connection.
 

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Unless it was in series-parallel before.

But the bottom pair may have been only for low bass, and the top pair for upper/low bass.
From the tweeter placement, I think that's likely to be the way it was originally.

But he wants the woofers all to be operating together. Sounds like he's blown up some amplifiers
when driving them. Maybe he needs a different amplifier, instead of changing the speakers.
 
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Not clear from your question as to whether you're asking how to wire / rewire the internal connections inside the speaker or connecting the speaker cabinets to the amp. Short answer to the internal wiring is don't change it if you have to ask. To the question of how to hook the cabinets up to the amp that depends on the impedance rating of the speakers. Hopefully they are marked on the back with an 8 Ω or 4 Ω and if not perhaps you can find the user manual and look it up. Almost all home stereo amps can run with two 8 Ω speakers on each channel. If your speakers are 4Ω and you want to run all four at once you will have run them in series. Wire from the red terminal on the amp to the red terminal of the first speaker, wire from the black terminal on the first speaker to the red terminal on the second and the last wire from the black terminal on eh second back to the black terminal on the amp. Do the same for the other amp channel and your in business.
 
OK so I have two rotel rb990bx stable to 4 or I use two mono blocks 1000w each balanced input through ina1651 Texas Instruments input stage or rca to tube splitting the phase to go into the ice power asp1000 balance from single ended . . Stable to 2 ohms . For amps
Preamps I use magus mfa , magus mfa “c” , rotel rc995 , Yamaha ax900u I basically received the speakers in the condition that I’m trying to bring them back so that’s how they . (All four ) if I were to run them free of a crossover bi wired would I wire them the same . I’ll put up pics of xover
These speakers are seas drivers 4ohm 10 inch . I’m not one to fix what isn’t broke but want to be sure these are reaching there full potential!. Thanks so much guys .
 
Best to use the stock crossover, maybe upgraded. It likely filtered the midrange from the
bottom 2 woofers, but ran the upper two woofers all the way up to the tweeter crossover point.

Running all 4 woofers with midrange will cause lots of interference and vertical lobing among them.
Also even worse lobing between the tweeters and the lower 2 woofers due to the longer distances.
 
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Now I see that one inductor is a little smaller so I think your right . If I were to be adding a midrange to these speakers could I then run all four drivers full instead of the woofers that are picking up the midrange now .
Thanks again btw . What a great site . 🙂