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PostPosted: Tue Aug 29, 2017 5:15 pm 
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Joined: Mon Dec 12, 2005 6:44 pm
Posts: 209
Location: Calgary, AB, CA
If matching impedance is what your end goal is just make sure however you wire them in a way where speakers final impedance will work with the amp. The original quad 57 had options to run as 4 speakers wired in series or parallel depending on your type of amp (used levinson, and the founder of Sme). I had them wired in parallel to keep the impedance at 8ohms and this also boosted the midrange. I also tried them in series for otl's but preferred the sound in parallel. Keep in. the quads are 16 ohm speakers so parallel is not too much of an extreme. In the end, I loved the sound and hated the excessively large footprint of 4 speakers. I could not live with the size. Happy experimenting.


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PostPosted: Tue Aug 29, 2017 9:50 pm 
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Joined: Fri Mar 25, 2016 12:47 pm
Posts: 116
Location: Leduc, AB, CA
If you insist upon a four speaker set-up, and it never occurred to me that you would ever need to because you already have two sub-woofers, which are supposed to supply the slam if you cross them over high enough, then all you need is a pair of high quality 6-ohm power resistors. (Plus connector blocks, two additional pairs of speaker cables and any number of short jumper cables)

The speaker pairs on each side should be attached together in PARALLEL (+ to + and - to -), which will yield a total resistance of 2 ohms. (This way you don't have to worry as much about the effect of the crossovers and the added hassles of putting them in series). Then you place one of the 6-ohm resistors in SERIES between the combined + terminals of the speaker pair and the + connector of the speaker cable coming from the amplifier. (2 ohms + 6 ohms = 8 ohms). You should probably get yourself a pair of, say, 8-pair Jones Blocks to make sure you have really tight connections and can accommodate all of the added jumpers and speaker cables you will need because the connections will have to be half way between the speakers, with 2 extra pairs of speaker cables (to perfectly balance the load to each speaker) to get you to the jones Blocks and to give you some play as you experiment with positioning.

The real question will be how much in the way of imaging will you be will to give up in order to achieve an unrealistic amount of slam. Your taste in sound and its practical and theoretical desirability will be put to the test. It would be highly immoral of me if I did not say that you seem only too willing to go all out to finally damage your hearing, if you haven't already. I'm sure that if you went into any number of dealerships and asked the original question before, or after, your journey of acquisitions, they would all have told you to cease and desist. The fixation with slam is not at all advisable and surely not worthwhile, by any measure, especially if it leads to any hearing loss. Nor is the pissing contest which has kept this discussion going long after it was actually long dead. Pure conjecture at the expense of others is not the definition of being of help!

The best sound result will be achieved by using one pair of Maggies and one series placed 4-ohm resistor per channel. This will give you truly world class imaging and you can experiment with pushing the Velodynes to the highest frequency at which they can play in order to maximize slam. You will always be able to sell one pair of speakers and the amplifiers and get a used pair of Bryston 7BSST2's or a new 4BSST3, which have amazing synergy with Maggies. Please be careful - the gods have not sent you on a quest. Best wishes and good luck!


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PostPosted: Wed Aug 30, 2017 3:33 am 
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Joined: Tue Jul 05, 2005 3:09 pm
Posts: 1213
Location: Sherbrooke, QC, CA
alladione wrote:
Natalie - has ignored the fact that both speakers are the same, So the impedance/frequency curve will be the same, its a mute point.



Try "moot"!


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