Originally Posted by Scott Simonian
A few questions for you....
Why a 5hz HPF? You know most of your electronics are rolling off that bandwidth anyway. It's a bit redundant and unnecessary for one there. Higher up, I get.
The EPX4000 amplifier does not like the <10Hz too much. It seemed like the lower frequencies would drain the amp and kick it into protection. With a HPF the amps are doing better and seems to have more headroom for the higher frequencies. REW measurements confirm that my HPF has a effect on the 5Hz HPF, even with Electronics roll-off.
Having a larger enclosure has zero effect on the higher bass frequencies.
OK, so then we can leave the conclution to either the driver itself or placement since my bass bins and Aura share the same type of Electronics.
This isn't a high power, low Q type driver and that might attribute to the lack of upper end dynamics but I'll tell ya, this is a best-in-class driver for upper bass response and distortion. You really shouldn't need a midbass system for these. Have you tried running them up to 120hz? If not, give it a shot.
I cant say that NS18 is a bad driver. It is very good and delivers great consider the frequency range it may work in. I have tried running it higher 120Hz and even higher, but it didt give me what I wanted.
I previously had B&W 604S3 mains, and I replaced them With the Tempest 12.
The sound between those 2 types of speaker is different. You may not see too much in a REW sweep, but you know they have a different sound.
The Tempest got me thinking, why is there so much difference in the sound?
B&W had clean output (if not driven too hard) and a "soft" signature. Tempest has more distortion and a "hard" signature, but still clean output (even if driven hard).
I figured the Eminence Deltra Pro 12 woofer in the Tempest delivered a more live sound where guitar and drum seemed more dynamic and "sharp"
Why this difference in sound as my Electronics are the same?
Could it be the related to the weight of the cone?
If you imagine yourself, holding 1KG in Your hands, try to move that 1KG as fast as you can - towards yourself and away frequently - How much energy would you use and how fast are you able to repeat that?
Then, if you lower the weight to 0,5KG, and repeat the test, how much energy and how fast are you able to move it?
My solution for this was to use Celestion FTR18-HD 4080HDX.
The power handling is about the same as NS18 but half the weight of the cone. (and much lower xmax)
To me, the FTR18 has more potential to respond more quickly than the NS18.
I dont say that MMS is key to everything, but if you look at that, in relation to the strenght of the magnet, you can see how much weight you are gonna move and what strenght you have the possibility to use.
Using NS18 for ULF and FTR18 for bass and Tempest as mains, has given me a HT With flexibility and great Dynamics (and headroom). I have never listen so much on live Music as I do now
And I do not need to play loud, I still get better Dynamics playing on low volume.
One other thing, When I reduced the NS18 operating frequency range, I needed a New amplifier for the FTR18's.
I now have more wattage to use than before, and the amplifiers used With NS18 has more watt available to use in the frequency range they work in.
Some People tend to have more speakers operating in the same frequency area to improve sound.
I have choosen to have more speakers, just narrowing the range of the frequency so the speakers can work where they are better. Not pushing the speakers to high or to low in frequency.
NS18 is a great driver, just dont expect it to solve all of your needs