The Official HSU VTF-15H Thread - Page 2

Tough question Rob! I like both for music, and haven't done any precise listening comparisons yet. The ULS-15 has a clean and smooth sound, while the VTF-15H has very tight and punchy mid/upper bass. My preference in sound is usually towards the latter attributes. That said, adding an MBM-12 MK2 to a ULS-15 would more than make up for that. Highly recommended for any ULS owners!

Sincerely,

I have often wondered if this will provide any benefit? Has anyone tried doing this with two identical subs? Run one in max extension mode and one in max output mode?

Not with HSU subs but I have run the same drivers in ported and sealed designs. I have also tuned one higher and one lower.


I do not know of any benefit of doing so, the best response is from 2 of them tuned the exact same, placed in the room to get the best response.

It's one nice looking sub. I'm very tempted. Seeing as it's ported, I would think it would integrate pretty well with my Ultras.

This is a really nice addition to the mix of under-$1000 subs--certainly one I will add to my list of those under consideration.

You could sell your Ultras and replace them with the 15H and come out ahead.

Any guess how this would compete with the original VTF3-HO with turbo?

Output wise, based on Illka's testing and the CEA2010 numbers that have been published for the 15H, the new sub is definitely an upgrade. It looks much nicer too.

so how bad would this thing smoke a velodyne dls-5000r which costs about the same?

Curtis those number are certainly impressive, if they are indeed the same CEA2010 methodogy Ikka use to measure the ultra. Not only is it better than the Ultra..it comes within 1-3db of the LMS 5400 in a similar box and tuning with 2000w.

That is a lot of stroke and displacement with not a lot of power.
Is this a conventional motor design or something like an XBL/2 or Underhung design?

Are those output numbers 2M GP or half space?

Neat product from about 4X too large for my use.

It would be nice if they developed something for people who don't own McMansions. We all don't have 10000 c.f. dedicated HT rooms.

Oh well, I guess hsu remains off the list.

Even if output numbers are slightly exaggerated, they are still impressive, and Hsu tends to under spec their numbers.

Maybe I am doing the math wrong, but taking the 6dB into account for the 1 meter measurement, the numbers pretty much match the Ultra...right?

I asked Pete about XBL/2, and he said "no". I have no info about the driver other than it was designed/engineered from scratch by Dr. Hsu.

Thank you Curtis. They are slightly higher but yes, very close.

That driver is pretty mean looking. There is definitely some output capability there. My question on the motor is it seems to be very efficient. A large magnet structure ?

I know it's soon but will there be any driver pics?
It looks handsome from the front. Surround is fat!!

Curtis, I think Hsu under specs their numbers, just look at their specs for the VTF subs compared against Ilkkas measurements. That being said, Hsu's numbers are nearly unbelievable, although I have no reason to doubt them. If anyone could pull this off, it's dr. Hsu. Imagine what a quad drive of those suckers would sound like!

They already make some compact subs. And I would have that big sub in my 17.5 x 14 room in a heratbeat. Not all have mansions, its just some of us are a little nuts.
Thank god for those who oblige the nuts!

My room is only 3300 c.f. The VTF-3 MK3 was a monster in it, this baby should be better in all aspects. If I sell the VTF-3 I should have enough money with what I already have saved for a nice veneer one. It should rock in my 1/3McMansion.

I love HSU subwoofers, starting with the TN1220HO that did 101db at 12.5 Hz. And that was 10 years ago from a sub with an introductory price of $450 (plus amp).

I like the triangular ports on the new model, however, they aren't a new design. Here is one sub that had triangular ports:

http://reviews.cnet.com/subwoofers/a...-20172461.html

This goes back almost 10 years. There may have been others that also had triangular ports.

This new HSU sub is a great addition to the HSU line and especially at the introductory price, a great value.

I believe I have just found my personal Christmas present. Dedicated room is ~15x10x7 but has opening to a 6000 cu. ft. basement (sub will be ~10ft. from LP). This thing will fit awesome laid on its side under the front projection screen, with the spl I am looking for and a price that I can meet. This will be used for 97% movies/tv and plan to have it set for deep tuning with the ports plugged, but can't wait to play around with different tuning aspects. I sure am glad I waited to see what HSU was working on before pulling the trigger on a new sub.

I am somewhat confused on the variable Q control, that looks to go from .3 to .7, could someone better explain this function and how it works?

Does that sub use the porting structure as also a bracing for the cabinet? Also, the ports on the ADS are not flared...the Hsu flares on both ends...internal and external. You are right though, not generally a new design.


My understanding is the pricing is not introductory...it is THE price.

Curtis

Good questions. I found the brochure from the ADS MS3 and this is what it says about the cabinet. Remember this is about 15 years ago.

"Made with heavily braced 3/4 inch MDF, the cabinets are key to the MetroSub's performance...."

"The LamFlow ports equalize air pressure across the speaker cone. The size and placement of the ports prevents the cone from tilting as it moves, thus keeping distortion low. The port geometry optimizes the Laminar Flow of air, which eliminates the "wind noise" produced by conventional ports.

You will have to decide for yourself if the description of the ports means that they were used for bracing. They were probably pretty sturdy as they formed a significant part of the bottom of the cabinet, and they were used to prevent the cone from tilting as it moved.

And, you are correct, as far as I can tell, that there was no flaring of the ports on the MS3.

I only remember the ADS MS3 because it was one of Tom Nousaine's favorite subs for several years, quite a while ago.

There are many subwoofers (particularly in Pro Audio and Car Audio) which have used triangular ports over the years. These designs are not continuously flared on both ends of the port like our design. In fact, from what I have seen, these designs typically do not have any external/internal flares at all.

We were surprised at how effective the port design was on the VTF-15H. In our internal testing, amazingly enough, these triangular ports showed significantly less port noise at moderate-to-high playback levels vs. comparably sized round heavily flared ports! In addition to providing the foundation for variable port tuning, these ports brace the largest panels of the enclosure. Compared to thin wide rectangular slot ports, the point of bracing is more optimal, and the ratio of cross-section-to-surface area tends to be more optimal too.

Sincerely,

If I were to order this say, tomorrow, Monday 11/8/10, when would I expect it to arrive in FL? My gf gets really pissed when she sees expensive packages show up at the door, and shes going out of town around Thanksgiving, so I want to try and time it to show up around then. lol.

Never heard a Hsu sub, but have read that the VTF3.3 is "musical" is that to be expected of the 15H as well?

Did I miss numbers for the 15H posted somewhere??

You're going to pretend they don't make smaller subs just so they can "remain" off your list?

At the Hsu forum:

http://forum.hsuresearch.com/showpos...47&postcount=1

Scroll down to 'Output Capability'.

shooot out..........

Very impressive numbers. I can't recall, does 1M vs 2M = 6db diff or 3db?

Interesting that they don't post these kinds of specs on their other subs ...

Pete,

Can you explain this design a little further? Having a hard time visualizing what continuously means in this context.

Thanks!