Originally Posted by the_sextein
Thanks for the graphs. If there is 12db of room gain I could see this easily hitting it's advertised specs. With the room size set to large it's going to dig deep. Nice and smooth response too, it looks great. With regards to decibel output, does this sub design have anything out of the ordinary compared to the B&C specs for the neo and Ipal? At what decibel level and frequency does port noise become audible?
We're down about 6dB from 15hz to 100hz. Most manufacturers would spec that as +/-3dB / 15-100hz / measured quasi anechoic. So I think 15hz extension is automatic regardless of room environment. Under that the rolloff is a little steeper so it makes exact in room predictions more difficult. I'd say 10-12hz is a given in anything less than 7500 cu-ft though. And even up to 10,000+ cu-ft, 12hz should be strong.
Nothing special about the woofers, just the same B&C Neo based, Italian made, high BL, high sensitivity, extreme thermal, with inductance control as well
There is no way to answer the question about port noise. We would have to define exactly what port noise is, very specifically, to address that in terms of an exact SPL level versus an exact frequency. With well over 100 TV36 subs in the field(maybe 150+?) I don't recall seeing much in the way of complaints regarding port noise on those although there may have been some comments I missed as my time spent here can be sporadic. And the laminar port flow capabilities of the TV18 cabinet is almost exactly half. So half the amp+half the woofer compliment matched with half the port flow. This wasn't accidental..
There are several very important aspects to port flow. These have been well documented and peer reviewed.
* The port flaring is just as important as the port size.
* You should avoid curves in the port whenever possible.
Of course every design will be a balance between many different considerations based on size, price, inventory hits, etc. So each manufacturer will have tough choices to make.
Honestly I never though these would be so popular. I keep looking at them as "2/3rd the price for 1/2 the performance" compared to the well established TV36 series. So it must be size. But these are BIG...but I guess there's a sweet spot in there between "BIG" and "too BIG" for many people.