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Subwoofers, Bass, and Transducers

Kevin12586's Avatar Kevin12586
10:35 PM Liked: 17
post #631 of 6516
12-20-2007 | Posts: 4,059
Joined: Feb 2005
Peter, can you take a look at my attached FR, can you think of why I have such a dip after 80Hz?

My crossover is set at 80Hz on my receiver.
LL
bori's Avatar bori
10:44 PM Liked: 83
post #632 of 6516
12-20-2007 | Posts: 2,916
Joined: Sep 2006
Quote:
Originally Posted by Kevin12586 View Post

Maybe someone else can better explain it than me, but unless I am mistaken even with dual subs, you still want your subs signal to be 75bd or else it will overpower the rest of your speakers.

Peter, is this true?


Yes, I understand what you are saying but, should I be worried about damaging anything. I calibrated each one seperatly to 75dbs so I am not running them hot.
Pete_Hsu's Avatar Pete_Hsu
12:17 PM Liked: 10
post #633 of 6516
12-21-2007 | Posts: 708
Joined: Dec 2007
Quote:
Originally Posted by Kevin12586 View Post

Peter, can you take a look at my attached FR, can you think of why I have such a dip after 80Hz?

My crossover is set at 80Hz on my receiver.

Kevin, do you mind posting a rough sketch of your room, including current speaker/sub positions?

Thanks
Pete_Hsu's Avatar Pete_Hsu
12:19 PM Liked: 10
post #634 of 6516
12-21-2007 | Posts: 708
Joined: Dec 2007
Quote:
Originally Posted by bori View Post

Yes, I understand what you are saying but, should I be worried about damaging anything. I calibrated each one seperatly to 75dbs so I am not running them hot.

bori, when you say damaging something, may i ask in what context?

I agree that it is not necessary to run the subs hot when using two vs one subwoofer. The advantage of two subwoofers would be in effectively cutting distortion in half for a given listening level, and in significantly boosting headroom and maximum output capability.
bori's Avatar bori
02:22 PM Liked: 83
post #635 of 6516
12-21-2007 | Posts: 2,916
Joined: Sep 2006
Do I need to worry about damaging the subwoofers? If I calibrated each one separetly to 75dbs would there be a problem?
Pete_Hsu's Avatar Pete_Hsu
03:46 PM Liked: 10
post #636 of 6516
12-21-2007 | Posts: 708
Joined: Dec 2007
The two subwoofers should be calibrated together. If you calibrate them separately, then your LFE will be +6db hot! Some people do like to run it a bit hot (+2 or +3db). That's ok to do as long as one notices no offensive noises.

Sincerely,
bori's Avatar bori
10:38 PM Liked: 83
post #637 of 6516
12-21-2007 | Posts: 2,916
Joined: Sep 2006
Quote:
Originally Posted by Pete_Hsu View Post

The two subwoofers should be calibrated together. If you calibrate them separately, then your LFE will be +6db hot! Some people do like to run it a bit hot (+2 or +3db). That's ok to do as long as one notices no offensive noises.

Sincerely,


Thanks Pete!
audio-newbie's Avatar audio-newbie
04:41 AM Liked: 10
post #638 of 6516
12-22-2007 | Posts: 11
Joined: Oct 2007
I recently purchased STF-2, and I have a question on placement. Please be patient w/ me as I am a newbie.

currently, I have my sub placed in a corner of HT room but away from listening position but on the side of the TV and receiver. how close should the sub to the wall? right now, it is only 6" away from (basically very close) or should it be maybe 12" away? especially on the ported side, should it have a "breathing" room or closer to the wall the better?

Also, what if i position the sub away from the corner but next to the TV. again, how far from the wall?

The question maybe ridiculous, but again I am a complete newbie.

Appreciate the inputs. thanks.
Pete_Hsu's Avatar Pete_Hsu
02:37 PM Liked: 10
post #639 of 6516
12-24-2007 | Posts: 708
Joined: Dec 2007
Hi audio_newbie!

6" of spacing is just fine between the port and the back wall. Corner placement is just fine.

Would it be possible for you to post a sketch of your room here?

Thanks

Sincerely,
Kevin12586's Avatar Kevin12586
03:41 PM Liked: 17
post #640 of 6516
12-24-2007 | Posts: 4,059
Joined: Feb 2005
Pete, did you miss my question above?
darkninja67's Avatar darkninja67
05:01 PM Liked: 10
post #641 of 6516
12-24-2007 | Posts: 1,230
Joined: Oct 2003
are there any Hsu owners pairing the sub with Monitor Audio speakers and if so how is the synergy? Thanks in advance
ezkcdude's Avatar ezkcdude
05:33 PM Liked: 10
post #642 of 6516
12-25-2007 | Posts: 31
Joined: Mar 2007
Can someone explain the sonic differences b/w the STF-2 and the VTF-1? I had a Dayton Titanic 10", but it's not working now (one too many turn-on thumps from my DAC). So, I'm looking for a new sub, and these two Hsu subs seem to be closest to what the Dayton could produce. My room is a medium-sized bedroom (~12' x 15' x 10').
ezkcdude's Avatar ezkcdude
07:15 PM Liked: 10
post #643 of 6516
12-25-2007 | Posts: 31
Joined: Mar 2007
Well, I ordered the VTF-1. I hope it works out.
vardo's Avatar vardo
07:46 PM Liked: 18
post #644 of 6516
12-25-2007 | Posts: 683
Joined: Feb 2007
ezkcdude, I think you made the right choise w/the VTF-1.
The VTF-1 is very similar to the original box sub from HSU,
the VTF-2. Same spec's, except the VTF-2 had a 150w amp,
and the present VTF-1 has a 200w amp.

I've owned two VTF-2's (would of bought a VTF-3, but it was
unavailable back then). I've also have two Dayton 10" Titanic
MKIII subs, which I use in a second (smaller) home theater.
They are good sub(s), but the VTF-1 will dig down to 25HZ
(max extention) and 32HZ (max output).

The Dayton Titanic subs are great for the money. But the 10"
will go down to 30HZ and that's about it. Pretty musical though.
If the amp in your Dayton 10" sub is bad you can replace it
from ordering it from Parts Express for about $100 w/ $50 off
of shipping......link:

http://www.partsexpress.com/pe/pshow...number=300-804

or if it's the driver:

http://www.partsexpress.com/pe/pshow...number=295-414

But I think you made the right decision with ordering the VTF-1,
good luck...vardo
ezkcdude's Avatar ezkcdude
07:52 PM Liked: 10
post #645 of 6516
12-25-2007 | Posts: 31
Joined: Mar 2007
Thanks! I don't really have time to diagnose and treat my Dayton amp, so that's why I'm going for a new one. Also, I think they changed the amp on it since I bought mine, over a year ago. From what I read about the VTF-1, mostly comments similar to yours, I think I did the right thing. This sub will be paired my bookshelf speakers, and solely used for music - not home theater. I will probably tune it for maximum extension, not output, and 25 Hz seems pretty good. I also like the look of the maple veneer.
Pete_Hsu's Avatar Pete_Hsu
12:14 PM Liked: 10
post #646 of 6516
12-26-2007 | Posts: 708
Joined: Dec 2007
Quote:
Originally Posted by Kevin12586 View Post

Pete, did you miss my question above?

Kevin, I posted a response in post #633. I was trying to get a better sense of room dimensions and placement position.

Thanks
Kevin12586's Avatar Kevin12586
11:24 AM Liked: 17
post #647 of 6516
12-27-2007 | Posts: 4,059
Joined: Feb 2005
Sorry, I missed that. I'll post a sketch in a little while
bori's Avatar bori
11:27 PM Liked: 83
post #648 of 6516
12-27-2007 | Posts: 2,916
Joined: Sep 2006
Quote:
Originally Posted by Kevin12586 View Post

Sorry, I missed that. I'll post a sketch in a little while



Just wanted to let you know that I calibrated both of my 3.3 subs the way you instructed and now they sound great. Thanks for your patience and help.
Kevin12586's Avatar Kevin12586
03:22 PM Liked: 17
post #649 of 6516
12-28-2007 | Posts: 4,059
Joined: Feb 2005
Quote:
Originally Posted by bori View Post

Just wanted to let you know that I calibrated both of my 3.3 subs the way you instructed and now they sound great. Thanks for your patience and help.

Glad everything worked out
Shift's Avatar Shift
10:56 PM Liked: 28
post #650 of 6516
12-29-2007 | Posts: 1,366
Joined: Jan 2003
Quote:
Originally Posted by Pharcyde23 View Post

Finally pulled the trigger on a VTF 2.3, after much comparison between SVS, eD, and Def Tech I decided that this was the one for me.
I'm looking for any settings/setup suggestions before this thing arrives. The rest of my 5.1 system is Def Tech with bipolar towers in the front w/built in 8" subs, powered by an Onkyo 805. The HSU will be replacing a Mirage Omni S8 which currently sits behind the couch. My x-over settings right now are 60hz for the fronts and 80hz for the sub, will I need to change these up with the HSU? Also what about the sub placement, any specific recommendations? The room is 15x15x7. Thanks guys!

Congrats being a owner of a HSU! So what was it that pulled you towards an HSU sub over an eD sub?

The reason why I ask and if anyone else here would opt your opinion please do so.

-But I am looking at either the HSU's VTF-2 MK 3 Subwoofer or the eD A2 - 300 Subwoofer.
Which between these two would be the better beast in the theater room?
Pharcyde23's Avatar Pharcyde23
08:24 AM Liked: 10
post #651 of 6516
12-30-2007 | Posts: 615
Joined: Jul 2007
Quote:
Originally Posted by Shift View Post

Congrats being a owner of a HSU! So what was it that pulled you towards an HSU sub over an eD sub?

The reason why I ask and if anyone else here would opt your opinion please do so.

-But I am looking at either the HSU's VTF-2 MK 3 Subwoofer or the eD A2 - 300 Subwoofer.
Which between these two would be the better beast in the theater room?

Thank you. I've had this beast for about 3 weeks now and couldnt be happier. It goes plenty deep and plenty loud for my room. I havent taken this thing above -3db on the receiver and above 30% gain on the sub.

I went with the VTF over eD simply because of the wait time. I'm in AZ and had the VTF arrive just 2 days after I ordered it. I've never heard an eD HT sub but from everything I've read they are very similar in performance. Some people say the eD might go lower but to me the difference between 17hz and 18hz wasnt worth the 6 week wait.
nixul's Avatar nixul
09:33 AM Liked: 10
post #652 of 6516
12-30-2007 | Posts: 3
Joined: Dec 2007
Anyone can enlighten me the difference between them? I am using it for movie.
HDMom's Avatar HDMom
12:23 AM Liked: 10
post #653 of 6516
12-31-2007 | Posts: 75
Joined: Dec 2004
Just want to say I'm absolutely blown away by the VTF-2 MK-3 I picked up on Friday. I haven't had time to properly calibrate my system yet but will definitely get to it over the coming days. Unfortunately my lack of technical knowledge doesn't allow me to make any helpful comments other than to say that I love what I hear! This is my first sub and to say that I'm blown away is an understatement. The only drawback is that I live in a smallish apartment and I don't think my neighbor would appreciate her china getting rattled around when my boys play Halo - looks like we'll be moving sooner than I thought.
Jakeman02's Avatar Jakeman02
12:29 AM Liked: 13
post #654 of 6516
12-31-2007 | Posts: 6,463
Joined: Apr 2006
Quote:
Originally Posted by nixul View Post

old VTF-2 vs the MK3

Anyone can enlighten me the difference between them? I am using it for movie.

Quote from the HSU website

"The new VTF-2 MK3 is basically a slightly less powerful version of the VTF-3 Mk 2, and just like the VTF-3, with 250W, a 12 inch woofer, and maximum extension down to 18 Hz. It gives you unprecedented value for your money - VTF-3 performance for a VTF-2 price!"
Shift's Avatar Shift
07:46 AM Liked: 28
post #655 of 6516
12-31-2007 | Posts: 1,366
Joined: Jan 2003
Pete,

Do you have a picture that you can post of the VTF-2 MK3 or the STF-2 Driver it self? I would like to see it if you can share that. Thanks
handyjr's Avatar handyjr
08:08 AM Liked: 10
post #656 of 6516
12-31-2007 | Posts: 2
Joined: Jun 2007
Happy New Year, members. I've been tracking this thread for awhile to ensure that most Hsu sub owners are happy, so your many positive comments have swayed me into buying one - my first new sub in over a decade! I bought the VTF-3 MK3 after helpful correspondence with Dr. Hsu on both the best model for my HT and placement considerations. It should arrive later this week, and I'll let you know how it sounds (and probably be asking for your help, too!).

Other subs considered: JBL Fathom; Martin Logan Depth; SVS, Velodyne

I'll post some links to some pics and a diagram of my HT later. Here's my rig:

Speakers: Meadowlark Audio Kestrel 2 (LCR), Owl (Surround), Swift (Surround Back)
Sub: DefTech Pro Cinema 100 sub (for a few more days!)
Receiver: Denon 3805
Projector: Sony VPL VW10HT
Screen: Draper (110")
Sources: Sony PS3, Dish ViP 622 HD PVR
mitchlewis's Avatar mitchlewis
10:03 AM Liked: 10
post #657 of 6516
12-31-2007 | Posts: 131
Joined: Jun 2007
We purchased a new VTF-3 MK-3 a few weeks ago and over all we're very happy with it. But we have never "calibrated" the unit although we did use the Denon Audessy auto setup microphone built-in to our new Denon AVR-3808CI receiver. We also cannot move the sub around to find the ideal position due to space constraints. I did check the levels of all the speakers including the sub with pink noise and a Radio Shack SPL meter.

With all that in mind, we do have one "problem". It seems like the sub is MUCH louder on some material than others. For example, we watched Planet Earth and the first disc (Pole to Pole) the bass sounded a little weak. But on the third disc (Rivers) during the salamander segment the bass is HUGE, so much so that we had to turn the sub channel level all the way down (-12db).

So here's my question....

Could we have some HUGE frequency spikes at certain frequencies and dips at other frequencies to make it seem like the sub is louder on some material. In other words, one movie might put out a rumble at 80Hz and another movie might put out a rumble at 140Hz. If our sub isn't calibrated (I really don't understand how I could calibrate it without some kind of multi-band EQ), then it might have a HUGE spike at 140Hz and a dip at 80Hz yielding a large difference between the two movies.

The temporary "solution" has been to use the Denon remote to raise/lower the sub channel volume. Or is that what everyone on this thread is doing as a "solution"?
handyjr's Avatar handyjr
09:00 AM Liked: 10
post #658 of 6516
01-01-2008 | Posts: 2
Joined: Jun 2007
Quote:
Originally Posted by mitchlewis View Post

We purchased a new VTF-3 MK-3 ... But we have never "calibrated" the unit although we did use the Denon Audessy auto setup microphone built-in to our new Denon AVR-3808CI receiver ... I did check the levels of all the speakers including the sub with pink noise and a Radio Shack SPL meter.

With all that in mind, we do have one "problem". It seems like the sub is MUCH louder on some material than others ...

Mitch: My first thought is that the work you did with your Denon Audessy and RadioShack SPL meter qualifies as calibration - its at least as much as 90% of people do. So pat yourself on the back for that!

I suspect that you are on the right track with your ideas about the source of your problem - it's probably related to room conditions and the normal peaks and valleys in low frequency sound waves. At certain frequencies, you're sitting in a "peak" at your listening position, while at other frequencies you're sitting in a valley (null). One easy test for this is to change your location while listening to the same source material. If you hear an appreciable difference in bass output, then you know it's a room response/location issue.

My understanding of the Denon auto-calibration software (and most others) is that they can reduce peaks, but they can't fill in valleys (nulls). I think your solutions will involve moving the location of your sub, or perhaps adding another one, to achieve a more uniform frequency response at your primary listening position.

Hopefully some of our more experienced members can offer more specific advice.

Cheers!
Major Nelson's Avatar Major Nelson
03:32 PM Liked: 10
post #659 of 6516
01-01-2008 | Posts: 83
Joined: Sep 2007
pulled the trigger yesterday on the 3.3. From all my research an everything I read hear on the site was a great help. Can't wait to get it in and setup now. I have to pick up my speakers this week as well...I'm either goinng with the B&W 600 series for the 5 speakers or possibly the CM's for the L/R/C speaker. Any input on which ones would match up better with the HSU? I'm leaning towards the CM's.
bori's Avatar bori
02:24 PM Liked: 83
post #660 of 6516
01-02-2008 | Posts: 2,916
Joined: Sep 2006
Quote:
Originally Posted by Kevin12586 View Post

Pete, did you miss my question above?


Hello Kevin,


I see you have dual HSU with MBM-12. I just ordered the MBM-12 and would like to know how to intergrate this smoothly with my two 3.3 subs. I have each 3.3 on opposite corners in the front of the room. I plan to put the MBM-12 nearfield. What are the steps I need to go through to get everything working correctly?
Tags: Hsu Research , Hsu Vtf3 Mk4 , Hsu Vtf2 Mk4 , Hsu Research Hb1 Mk2 , Hsu Research Vtf 2mk3 , Hsu Research Hc 1 Mk2 , Hsu Vtf 15h Subwoofer , Hsu Research Uls 15 Subwoofer , Hsu Research Stf 1 Subwoofer 150 Watt

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