Originally Posted by Newbie01
Do makers normally release where a sub is tuned to? I see on the Rythmik Sub you can choose the tuning of the sub? 14 Hz, 20 Hz, and 28 Hz
I can't see anything on the HSU site.
Most do. Personally I trust third party measurements from someone like Ricci much more than manufacturers specs.
So if I set the sub to 14 hz...it will have much more output at 14 Hz than a sealed sub...but whereas a sealed sub may get to 10 hz...the fall off a ported sub may max at 12 hz?
Pretty much. Typically the lower a ported sub will go, the larger the box, driver, etc. So to get useable sub 15hz extension from a ported sub, you are usually talking about a big box. There are some massive ported subs out there that can get to 10hz, but we are talking huge boxes that are usually DIY or kits.
What am I giving up to "tune" a sub that low? Do I loose power from say 15-20hz or 15-28hz to get allot of output at 14hz?
You are giving up output. Consider the Hsu VTF 15H. One port plugged gives you maximum extension. Two ports open results in less extension, but more output. No free lunch. Most movies have far more content above 20hz than below 20hz so you have to decide which you prefer, one port open, or both ports open. It is nice to have choices
HSU info...means in Bass Extension mode this is tuned to 16 Hz?
I looked on HSU site:
VTF-3 HO At a Glance
Amp Power (RMS) 500 Watts
Bass Extension (max extension mode) 16 Hz
Bass Extension (max output mode) 22 Hz
Woofer Size 12 Inches
Crossover Bypassable 24 dB/Oct, continuously variable 30 - 90 Hz low pass filter
Ports Dual flared 4 Inch
Inputs speaker level (2), line level (2)
Power Outlet Requirement 600 Watts
Ship Weight 93 Lbs
Dimensions 21.5”(h) X 17”(w) X 25”(d)
Max extension would be with the one of the two ports plugged and max output would be with both ports open. Same with Rythmik or Outlaw. So you really have to take it all in when researching. This is what I love about data-bass.com where you can compare one port vs two ports open and the effect on output and extension. You also want a well engineered ported sub, because if not properly designed, you can get port chuffing if you are pushing the sub too hard. The nice thing about the Hsu and Rythmik subs is they really let you tune the sub to your preference (max output vs max extension). Of course this means taking the time to make the changes and then measure them to see what you like best. If WAF is not a concern for you, the Rythmik 15HP seems like a great sub. Potentially add a second down the road.