power consumption vs power output a/v receiver

I should have explained. Compare the performance between the bass heavy track on pure direct in stereo with just the fronts playing and then switch to 7 channel stereo - in both cases set the avr to no subwoofer and large front speakers. In 7 channel mode there will be less bass at higher volumes compared to the same volume with just your front running (no subwoofer in both scenarios).


Don’t crossover higher than 80hz - a subwoofer just isn’t designed to handle the higher 150hz and lower notes (cone can’t move fast enough).

 

I understood what you were saying. I can detect it without even going to all seven channels.

Before I build a subwoofer for up to 160 HZ, which would require it to perform well up to double that depending on crossover slopes (and I do roll my own active analogue crossovers if required) I will check out its frequency response, and group delay etc. It will probably mean x-max won't be a whole inch

For example though Dayton Audio says this 10-in subwoofer driver is okay up to 2khz for example. X-max is 'only' 14mm.

As a general proposition your/THXs advice on 80 HZ is easy to recommend and that's where my current setup, Double 8-in woofers and an epic long throw 12 inch sub, is at.

 

I wouldn't say that's ok above 500Hz, it gets real messy above that, but sure will reach 2k. you don't want it there.

 

Yeah there's a nasty resonance there. My plan I'll be down - 70 decibels at 720 HZ.

 

That's actually not basic resonance but cone breakup, as a rule if you want clean sound you don't want to excite this region (what isn't in a single response chart is what it looks like on a waterfall plot), typically this means keeping a a couple more octaves away from the region depending on your crossover choice.

The directivity will be very strong on a 10" at those freqs, as a rule the directivity starts to diverge at about 1 wavelength which on a 10" woofer is the low 1k mark.

The problem is that because that unit is intended for sub duties, Dayton haven't included results to do with these other factors because for most subwoofer users it isn't relevant. But if you look at extra large woofer graphs you will definitely see that there is always the same directivity divergence point (fullrangers notwithstanding) as it's a physical size issue. See: https://sbacoustics.com/product/10-sb29nrx75-8-norex/ for e.g.

Off the top of my head if I were to cook something up around 10"s in the mains, it would be opposed sidefirers crossed at 240Hz ish, crossed to a fullrange or coaxial of about 3-4". You're probably going to be stressing out the smaller end of the size though trying to keep up with the 2x10" so I would probably seriously be looking at the larger coaxial setup to make sure it keeps up and stays clean. All digital XO, you're going to illuminating so much front room modes that you'll need a full correction and treatment, unless you're after the crunched out partyhard sound.

 

I was thinking of 160 Hertz crossover from the sub and was just responding to a post saying that I shouldn't do that. I only mentioned it in this thread because of the implications of taking up another octave in the subwoofer for power amplifier headroom for main speakers in home cinema. I reckon that Dayton woofer for example would be just fine at 24 decibels per octave at 160 HZ.

From there up I'm planning a two-way with a 5.25in midwoofer. Probably overkilling the bass max SPL but if it's going to do Home cinema duties that's how it has to be.

Thanks for taking the time for all of the details, it's stuff I know too I reckon you might be more into it than I am though. I'm happy calling standing waves on a flexing speaker cone resonance without distinction.

 

Yeah fair enough, got a bit carried away there .

Yeah weird driver specific quirks notwithstanding, that Dayton's not going to be a problem designed properly being used at 160, even with a 12dB/oct. But of course if you take an off the shelf boxed sub you're going to get mixed results trying to run them high as they wouldn't be intended for it.