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***Official HSU owners/support thread!*** - Page 188

post #5611 of 6210
I have a Monster refference center for clean power/outlet that I would like to connect my Hsu to however, the power cord does not reach it. Is it ok to use an extension cable to connect to the Hsu and Monster outlet to keep sub safe from surges?
post #5612 of 6210
As long as it is of similar/high quality, it should be fine. It might be overkill, but I only buy 12/10-guage (heavy duty) extension cords. The guage will ultimately depend upon the desired length, but with high powered devices like subwoofers, power tools, etc. there's no sense in taking the cheap route if the end goal is equipment protection.
post #5613 of 6210
I'm getting to the point where I need to make a decision on a sub for my HT. This is a dedicated room that will be used primarily for movies, gaming and some TV (mostly sporting events). The room is approximately 12.5' x 21' x 9' with a perimeter soffit. Soundproofing is whisper clips with hat channel on all walls and ceiling with double drywall and greenglue. No windows. One door that is a solid core 1-3/4" thick. Door seals and auto threshold sweep. The room will have fabric walls covering acoustic treatments. The screen will be acoustically transparent (SeymourAV Center Stage XD) on a false wall with LCR behind it, and the side and rear surrounds will be hidden in columns. Plan is for the sub to also live behind the false wall which will be approximately 2'10" deep. Here is a drawing of the layout.

Floor1.jpg
(more pics and info on the room in my build thread linked in my sig)

I'm trying to decide between the VTF-2 MK4 and the VTF-3 MK4. Receiver will be a 7.2 (unsure on brand/model yet), so I will have the capability to expand to 2 subs later if needed. Would like to make it work with one if I can. I appreciate any help and advice you have for me. Let me know if you need any other info.

Thanks!
post #5614 of 6210
Go big, VTF3. I went from VTF2 to VTF15 and have not regretted it for one moment.
post #5615 of 6210
Quote:
Originally Posted by gadgtfreek View Post

Go big, VTF3. I went from VTF2 to VTF15 and have not regretted it for one moment.
Thanks for the reply. I kind of figured that bigger is better...tongue.gif I'm more curious as to what would be the most appropriate sub for my size space, and why. Still trying to learn as much as can on this journey.
post #5616 of 6210
I've had a pair of HB-1s and a ULS-15 set up now for a couple of days in my family room with a Panny GT50, and old Denon AVR and a piece of crap BluRay player for playing CDs. I have a very nice HT elsewhere in the house so this was just meant to provide decent listening in our main living area. My thoughts so far:

- The ULS 15 is pretty much what I expected. I have a sealed 15 inch Paradigm sub in my HT so I knew I would like the sound. I really like the relatively compact dimensions and rose it finish.

- The HB -1s have been a bit of a shock even though I had read many glowing reviews on them. Having over 10k in speakers in my HT, I was not prepared for a pair of speakers costing $400 to sound this good! I listened to them without the sub first and was immediately impressed with the bass....I could have lived with these without the sub, though the sub does take the experience to another level. The word that kept coming to mind when listening to them was "smooth". As in butter, silk, just a very pleasing presentation of the music. The mids, especially on female vocals, are as natural as I've heard, though with the slightest trace of fullness at the owner end of that band. I also was impressed with the soundstage they threw....the music is just "there". The only slightly negative thing I could say, and this is a ridiculous thing to be critical of a $400 pair of speakers, is that they aren't as good as other speakers I've heard in revealing inner detail. Bottom line though is I feel like I just stole something! There has to be something illegal about getting sound this good for so little.
post #5617 of 6210
Will it cause any harm to leave my stf-2 on all the time?
post #5618 of 6210
It won't hurt the sub, Bond.
post #5619 of 6210
Quote:
Originally Posted by shadyJ View Post

It won't hurt the sub, Bond.
Thank you, Sir.
post #5620 of 6210
I have a VTF3 MK3, can I seal both ports using foam plugs without damaging the sub? If Yes:

1- What setting should I use? Max extension which should have 1 port open or Max output that says to leave both ports open.

2- I only have 1 foam plug, can I buy another separately from HSU?

3- Anyone runs their VTF 3 Mk3 in fully sealed mode, how does it sound? My room's around 3200 cu ft.
post #5621 of 6210
Quote:
Originally Posted by metallicaband View Post

I have a VTF3 MK3, can I seal both ports using foam plugs without damaging the sub? If Yes:
1- What setting should I use? Max extension which should have 1 port open or Max output that says to leave both ports open.
2- I only have 1 foam plug, can I buy another separately from HSU?
3- Anyone runs their VTF 3 Mk3 in fully sealed mode, how does it sound? My room's around 3200 cu ft.

You can seal ports, but basically all you would be doing is rolling off the subwoofer at a much higher point. You will be losing low frequency bass. It won't damage the sub though. If you are plugging both ports, it doesn't matter where the extension switch is set. You can order another foam plug from Hsu, although they are expensive there, something like $20. You could also just buy a block of soft foam and cut out a plug yourself, that might be cheaper.
post #5622 of 6210
Can anyone compare the frequency responses between the svs pb12. And the vtf3-mk4?

Thanks
post #5623 of 6210
Quote:
Originally Posted by metallicaband View Post

I have a VTF3 MK3, can I seal both ports using foam plugs without damaging the sub? If Yes:
1- What setting should I use? Max extension which should have 1 port open or Max output that says to leave both ports open.
2- I only have 1 foam plug, can I buy another separately from HSU?
3- Anyone runs their VTF 3 Mk3 in fully sealed mode, how does it sound? My room's around 3200 cu ft.

Hsu would tell you to use "max output" with both ports plugged. You can get away with max extension if you never play it loudly.

You can just roll up a bath towel for the other port (Hsu told me this.) Experiment with different sized towels and folding/rolling technique and you can get a really good fit.

With the Mk3, so no Q control, you get what seems like a little tighter sound with both plugged. With the Mk4 and Q control it's not necessary. All you're really doing in either case I think is rolling off the mid bass a bit.
post #5624 of 6210
Thanks a lot for replying shadyJ & fjames.

Guess I can try sealing the port with a towel and if I liked the results I'd get another foam plug from HSU for permanent use (I'm just OCD like that lol). I'll try sealing the port to the point that I feel no air is escaping with bass heavy sound tracks, is that a good indicator that the towel has a good fit?

Also, a very noobish question, what does the "rolling off" term mean when it comes to subwoofers? Lowering the mid bass frequencies so I'd possibly have less peaks in that area which results in lowering the boomy bass effect?
post #5625 of 6210
Quote:
Originally Posted by metallicaband View Post

Thanks a lot for replying shadyJ & fjames.
Guess I can try sealing the port with a towel and if I liked the results I'd get another foam plug from HSU for permanent use (I'm just OCD like that lol). I'll try sealing the port to the point that I feel no air is escaping with bass heavy sound tracks, is that a good indicator that the towel has a good fit?
Also, a very noobish question, what does the "rolling off" term mean when it comes to subwoofers? Lowering the mid bass frequencies so I'd possibly have less peaks in that area which results in lowering the boomy bass effect?

Roll off here means the point in the frequency spectrum at which the sub starts losing the ability to produce sound. For instance if you set the VTF3 to max extension mode, it will play down to 16 hz evenly but below that it rapidly loses output. Likewise with max output mode, where the roll off occurs at 25 hz. If you plug the port, you will knock the roll off to a much higher point than 25 hz. You see, the ports output most of the low frequencies. They act on the same principles that make a bottle produce sound when you blow over the top of it- this is called Helmholts Resonance. So if you block the noise they make, you are killing the deep bass of your sub.
post #5626 of 6210
Quote:
Originally Posted by shadyJ View Post

Roll off here means the point in the frequency spectrum at which the sub starts losing the ability to produce sound. For instance if you set the VTF3 to max extension mode, it will play down to 16 hz evenly but below that it rapidly loses output. Likewise with max output mode, where the roll off occurs at 25 hz. If you plug the port, you will knock the roll off to a much higher point than 25 hz. You see, the ports output most of the low frequencies. They act on the same principles that make a bottle produce sound when you blow over the top of it- this is called Helmholts Resonance. So if you block the noise they make, you are killing the deep bass of your sub.

Thanks for the explanation, if I understood this correctly it means the subwoofer will have a difficult time producing low frequencies when both ports are plugged, but why is that when one port is opened produces lower frequencies better than when both are open? I guess it has something to do with how acoustics work or maybe for safety reasons HSU requires you to at least seal one port?

I've e-mailed HSU asking them about the port plugs and thought I'd ask if they can give me a number about how low the Hz can get when both ports are sealed, this was their response:
"What will be the minimum produced frequency in Hz once sealing both ports?
Bass will start rolling off earlier, but below 20 Hz, the roll off is actually less."

The roll off is actually less under 20 Hz part confused me now lol

He did mention that the subwoofer will have to work a lot harder when both ports are sealed though so that's something I should keep in mind because I live internationally and would really like to avoid facing any issues with the sub:
"The disadvantage is less low bass output and the woofer has to work a lot harder (all output comes from the cone, not from the ports)."
post #5627 of 6210
What is the best setting on the vtf3 mk4 to watch movies were it's not boomy?
post #5628 of 6210
Quote:
Originally Posted by metallicaband View Post

Thanks for the explanation, if I understood this correctly it means the subwoofer will have a difficult time producing low frequencies when both ports are plugged, but why is that when one port is opened produces lower frequencies better than when both are open? I guess it has something to do with how acoustics work or maybe for safety reasons HSU requires you to at least seal one port?
I've e-mailed HSU asking them about the port plugs and thought I'd ask if they can give me a number about how low the Hz can get when both ports are sealed, this was their response:
"What will be the minimum produced frequency in Hz once sealing both ports?
Bass will start rolling off earlier, but below 20 Hz, the roll off is actually less."
The roll off is actually less under 20 Hz part confused me now lol
He did mention that the subwoofer will have to work a lot harder when both ports are sealed though so that's something I should keep in mind because I live internationally and would really like to avoid facing any issues with the sub:
"The disadvantage is less low bass output and the woofer has to work a lot harder (all output comes from the cone, not from the ports)."

A long, small diameter port is going to produce a lower tuning point. The wider the diameter of the port, the higher the tuning point. Having two ports is like having one wide diameter port.
As for Hsu's statements, on sealed subs, the roll off happens at a much higher point, BUT it happens much more gradually. So a ported sub might stay strong down to 20 hz and then drop off very rapidly below that, but a sealed sub might start losing output at 35 hz, but rolls off so gradually that it will still have some output below the point at which the ported sub is dead silent. Here is a picture that kind of describes what I am talking about:

Basically a sealed sub will have some deep bass output, but not a lot. You won't be hearing much deep bass from a a sealed VTF3.
post #5629 of 6210
Quote:
Originally Posted by asere View Post

What is the best setting on the vtf3 mk4 to watch movies were it's not boomy?

Asere, the VTF3 shouldn't be boomy in any setting. If you wanted the absolute tightest bass from a VTF3, my advice would be to run it sealed, switch the Q to .3, and the mode to max output mode. You will lose all the deep bass this way, but the woofer will be in the most heavily damped operation. However, if you are getting boomy bass over there, my advice is to look at different placement for the subwoofer. I think boominess will be a problem with the room acoustics. Are you running any kind of room correction EQ like audyssey?
post #5630 of 6210
Quote:
Originally Posted by shadyJ View Post

A long, small diameter port is going to produce a lower tuning point. The wider the diameter of the port, the higher the tuning point. Having two ports is like having one wide diameter port.
As for Hsu's statements, on sealed subs, the roll off happens at a much higher point, BUT it happens much more gradually. So a ported sub might stay strong down to 20 hz and then drop off very rapidly below that, but a sealed sub might start losing output at 35 hz, but rolls off so gradually that it will still have some output below the point at which the ported sub is dead silent. Here is a picture that kind of describes what I am talking about:

Basically a sealed sub will have some deep bass output, but not a lot. You won't be hearing much deep bass from a a sealed VTF3.

That made perfect sense, thanks a lot!

I actually haven't even configured my HT since I moved, didn't even turn on my sub yet, but would like to know my options if the bass sounded too boomy (my old square room was such a pain), I also have the option to position the subwoofer right behind the listening position which if I'm not mistaken Dr. Hsu recommends or something like that so that could be interesting, but I'll get into that once I started calibrating stuff.

If one port sealed (max extension mode) sounded fine to me then I'll definitely use it, but will checkout totally sealed if the bass sounded too boomy which I really hate.
post #5631 of 6210
How come with the sub defeat switch on off the sub sounds boomy?
post #5632 of 6210
Quote:
Originally Posted by asere View Post

What is the best setting on the vtf3 mk4 to watch movies were it's not boomy?
If it's boomy it probably has to do more with its location in the room. Do the sub crawl to find the best spot and go from there.
post #5633 of 6210
name="ambesolman" url="/t/808485/official-hsu-owners-support-thread/5610#post_22601019"]
If it's boomy it probably has to do more with its location in the room. Do the sub crawl to find the best spot and go from there.[/quote]

Its in a location with high spl. Same issue in different areas.
post #5634 of 6210
Will i do any harm to roll up a cotton towel and stuff it into the port on my stf-2? What is the minimum distance from a wall that you should place the port? How important is the port for cooling? Thanks guys.
post #5635 of 6210
Quote:
Originally Posted by Bond 007 View Post

Will i do any harm to roll up a cotton towel and stuff it into the port on my stf-2? What is the minimum distance from a wall that you should place the port? How important is the port for cooling? Thanks guys.

Lol, the port is not for cooling, it resonates and produces the lower frequencies. I describe its function briefly in this post. It won't hurt the sub to plug the port, however you will lose the lower bass frequencies. In my opinion, it is not worth plugging the port.
post #5636 of 6210
Quote:
Originally Posted by shadyJ View Post

Lol, the port is not for cooling, it resonates and produces the lower frequencies. I describe its function briefly in this post. It won't hurt the sub to plug the port, however you will lose the lower bass frequencies. In my opinion, it is not worth plugging the port.
Thanks. I am glad you got a laugh out of my question. I figured it was kind of goofy but I wanted to be sure. I know that cooling is not the primary purpose of the port but since this amplifier has no cooling vanes on the outside I thought that maybe plugging the port would make it run hot.
post #5637 of 6210
Hello to bass seekers, I am close to adding a sub woofer (very first real one) to my HT. I would appreciate input from you on a couple of things.

In between VTF MK4 and 15H which would be enough to give me a good hit? I have attach the layout of the HT (family) room where it is next to the living room and the kitchen. The ceiling height is about 8'.

I have also dropped 3 possible placement locations for the sub woofer (SW1, 2 or 3), I am leaning towards position SW1. What do you think?

Thanks a bunch.

subwoofer.jpg 48k .jpg file
post #5638 of 6210
Quote:
Originally Posted by SHadoWFoX View Post

Hello to bass seekers, I am close to adding a sub woofer (very first real one) to my HT. I would appreciate input from you on a couple of things.
In between VTF MK4 and 15H which would be enough to give me a good hit? I have attach the layout of the HT (family) room where it is next to the living room and the kitchen. The ceiling height is about 8'.
I have also dropped 3 possible placement locations for the sub woofer (SW1, 2 or 3), I am leaning towards position SW1. What do you think?
Thanks a bunch.
subwoofer.jpg 48k .jpg file

I have about the same size and same room layout as yours and the VTF3 MK4 does an amazing job pressurizing the room. As far as location I would first do the sub crawl with the frequency test cd that comes with the sub. Place the sub on top of the couch where you normally sit (listening area) and play the different frequencies at different locations using an spl meter. The place where you get the flattest response that would be the area to place the sub in most cases because the high spl's can sometimes make the sub sound boomy depending where it's next to. If that is the case place it in the second or third best area.
post #5639 of 6210
Quote:
Originally Posted by SHadoWFoX View Post

Hello to bass seekers, I am close to adding a sub woofer (very first real one) to my HT. I would appreciate input from you on a couple of things.
In between VTF MK4 and 15H which would be enough to give me a good hit? I have attach the layout of the HT (family) room where it is next to the living room and the kitchen. The ceiling height is about 8'.
I have also dropped 3 possible placement locations for the sub woofer (SW1, 2 or 3), I am leaning towards position SW1. What do you think?
Thanks a bunch.
subwoofer.jpg 48k .jpg file
That's a lot of space to pressurize. I'd go with the 15h is position 1
post #5640 of 6210
Quote:
Originally Posted by ambesolman View Post

That's a lot of space to pressurize. I'd go with the 15h is position 1


Yes the 15H might be better to be safe considering room size. Position 1 looks good but I would do the crawl to find closest best spot.
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