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OK, one last response :D Steve, you are misunderstanding what I am saying. I am not saying that a driver with higher excursion will have higher overall IMD (including all the non-harmonically related components that make up IMD, including driver excursion-related distortion and other...

Steve, frankly it is a bit insulting and disappointing to see you act and post with such hostility. It's no big deal though, it's always nice to be called a "fraud" and "foolish". :) I don't know why it is so difficult for you to understand my argument. Ultra high excursion is ultra high...

Another great question Ilkka, to which I really don't know the answer to, HA!

That is a great question. IMD is made up of various non-harmonically related distortions, of which driver excursion-related distortion is just one component. Higher excursion clearly increases the driver excursion-related distortion component of IMD, but there are other elements of the driver...

I do not feel that is it good to attack or harrass anyone on a personal level.

Hi Ilkka :) This is a forward-looking philosophy. If you read again, notice I said that we would rather not use one "ultra" high excursion driver, but rather more cone area and lower excursion, in order to achieve a given SPL level. This is for various reasons, including lower IMD. I do not...

Hello Mark, Using Ilkka's data on IMD, it actually strongly supports our philosophy - if one uses two 12" woofers similar in design to Thilo's woofer but less Xmax, the IMD generated would be similar to the 115 dB results - each woofer would only need put out 114 dB to get 120 dB total. In...

Good afternoon Steve, It would certainly be possible to realistically compare a subwoofer with single higher excursion driver versus a subwoofer with multiple lower excursion drivers. This is exactly the situation with the current dual driver ported versus single driver ported subwoofers in...

Dear Robert, I can't speak for the design goals of other companies, but rather explain our design goals and philosophies with respect to subwoofer design. Remember that the VTF series has been around since the late 1990's, the first variable tuning subwoofer of it's kind. So we have had...

Certainly a valiant effort at quantification, Ilkka, but I am surprised that many are so quick to jump to conclusions about a topic that is more complex than it seems and that most have a very limited understanding of. Let’s talk about the test. 120db at 4” from the woofer does not translate...

Gentlemen, I am going to listen to some music now. Let us all try to to build people up rather than break them down, and try to educate people instead of ridicule them. Sincerely,

How fast was that, Alan! I have no agenda other than to spread qualities of truth, virtue, honesty, integrity, faith, and respect. If anyone else feels otherwise, then by all means let's discuss in private. These are all qualities that everyone at Hsu Research values. Dr. Hsu in particular...

Good evening Robb, You cannot be serious. AlanZ has come as close as one can to "harrassing" me during my relatively short time here at this forum. It is one thing to express an opinion, but to target one individual with negativity over and over again is a different story altogether.

Good day Alan, Please be careful when attacking my character on a personal level. You did it yet again in your post above, and you have done so several times in the past. Do not force me to dig it up for you, and for the moderators at this good forum. :)

Hi Alan I am not pleased to see this verbal attack from you on my character. This is not the first time from you either. Arthur and I have never, ever spoken before in public or private. I can see why he and others would be excited, since it has been so many years since we introduced a...

Dear Robb, When I originally posted in this thread some time ago, I just knew that someone would quote this :) At the Hsu Research forum, free speech is always welcome. We are never going to stifle free speech. What is NOT allowed is for one forum member to attack or verbally abuse another...

This is a good point, Arthur. With any speaker brand ( particularly internet speaker brands), there are always some people who have a very strong sense of brand loyalty, and they show it on the various audio-related forums. On our forum, we encourage people to be friendly and supportive, and I...

I am sorry to hear about that Scott, but I can assure you that our Hsu Research forum is a very friendly place where people share in a sense of community and where people share knowledge too. Everyone is welcome to come there. The Hsu forum is now a moderated forum. I personally try to make sure...

Hi Tom :) I think I have already made my viewpoints quite clear enough, thank you.

I already answered this above. Your argument about reliability just doesn't make sense. It should be obvious that the more a cone is able to move in and out, the greater chance there will be for something to go wrong. In fact, we just had someone post at our forum that I keep hearing about...

It is a design choice for us to carefully weigh all types of distortions. Remember, higher xmax will not always mean higher headroom because of the various efficiencies involved with driver design. Light cones tend to have high upper bass headroom. Also, the headroom in the lowest bass is...

Hello Tom :) That is something that you need to figure out. :) And about reliability, the point is not that an ultra high excursion driver cannot be fairly reliable. The point is that limiting or reducing driver excursion will lead to higher reliability. That is why we tell people that...

Not exactly, we felt that about 2" peak to peak linear excursion was more than enough to satisfy our design requirements, the requirements being to maintain a relatively even power response without woofer bottoming. Even at maximum output levels where driver excursion demands somewhere above...

Not exactly, we felt that about 2" peak to peak linear excursion was more than enough to satisfy our design requirements, the requirements being to maintain a relatively even power response without woofer bottoming. Even at maximum output levels where driver excursion demands somewhere above...

Tom, you are misunderstanding and misinterpreting our viewpoints on high excursions. When I say IM distortion, I am referring to what is commonly known as Doppler distortion (apologies to anyone if that was not clear). I am not referring to BL nonlinearities or anything else. Of course we...

Tom, as much as I would like to spend more time responding to some of your comments above, I will avoid doing that in order to respect the decisions of the moderators. I would like to make one thing clear though: We would never, ever, ever spread "BS" or "red herring" information about subwoofer...

Good evening Tom, I'm not sure what you mean when you say at these frequencies. Inter-modulation distortion occurs when one frequency modulates another higher frequency that is not harmonically related to it. Inter-modulation distortion is something that several prominent researchers and...

Oh no no eddie, you made a great decision in going with the dual Mirage S12 subwoofers. That is really a bargain of major proportions, and you will be happy for many years to come, I am sure of it. Sincerely,

Dear Lance, The 35-40k/pair speakers are from TAD loudspeakers. http://tadhomeaudio.com/ The Pioneer speakers are using some technology from TAD. Sincerely,

Oops, sorry about that Eddie, the email must have gotten lost in his mailbox while we were at CES :frowning: Good call on the Mirage, that is an amazing price for that unit, a really good find! Mirage makes very good speakers and subwoofers! Sincerely,