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Using 4 and 8 Ohm Together

I posed the same question to Hartke and here was their response:

Riis, I replied to Hartke and mentioned the issues when set up in full-range. If they respond I'll post it here. Prior to this setup I had always used my 4x10 with no problems. I'm hoping the quirk when I had the balance all the way to one side for the 4x10 was due to the fact I still had the 1x15 hooked up even though I wasn't 'using' it.

Thanks for the interim follow-up. It is perplexing. I would hate to "cut the legs out" from your 4 X 10 at a xover freq of 250 hz when the cab itself is capable of handling content well-below 100 hz.

Riis
 
Thanks for the interim follow-up. It is perplexing. I would hate to "cut the legs out" from your 4 X 10 at a xover freq of 250 hz when the cab itself is capable of handling content well-below 100 hz.

Riis
Why? That's what biamping does, and the point is clarity, not volume.

One thing you need to check out if you are mixing dissimilar cabinets (especially if full range) is the absolute phase/polarity of the speakers. Thump test the cabs with a 9V battery to make sure the speakers jump the same direction with the same stimulus.
 
I'm not an expert, but my guess is that the 4 ohm 4x10 cab getting 350 watts would be much louder than the 8 ohm 1x15 cab getting 240 watts.

Bass frequencies consume more power than treble, so I would let the crossover send the lows to the 4x10 and the highs to the 1x15 to balance out the loudness.

the 4x10 is fully capable of doing the lows and the 1x15, while not a tweeter by any means, would be able to use all of it's 240 watts to push the mids and highs.

One might think it would be dark-sounding, but plenty of bass players use a 1x15 or 2x15 cab without a tweeter and it sounds fine.

Also remember that Hartke XL with the aluminum cone is strongly voiced for mids and highs even if it is a 15".

Sounds like a sweet setup to me!
 
yep, even all three.

i would recommend either the 4Ω 4x10 by itself for smaller gigs (amp set to 4Ω), or that plus the 2x10 cab for bigger gigs (amp set to 2Ω). that way, the resulting "6x10" would get equal power to all 6 speakers.

the 8Ω 4x10 is going to be unbalanced when used with either of the other two cabs, and shouldn't be used with the amp by itself, as the SVT doesn't have an 8Ω setting.