GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Audio Discussions
In the Thread: Constructing LF modules to the limits

Post Subject: It is not only about volume displacement.Posted by Romy the Cat on: 9/22/2011

haralanov wrote:
Romy, I do agree with all your comments.
It is true that the magnitude of the rubber taste very much depends on the crossover frequency. I used them below 64Hz, but with first order filter, implemented before the amp that drives them. With that kind of setting there is very slight rubber taste, and it is absolutely not annoying, but it is there and I’m able to hear it. I intentionally do not use steeper filters. I very much like the way how bass arrays portray the low frequency scale and size. A pair of woofers listened at 90dB are far below the level of sonic 3D effect (sorry for the stupid phrase, but I cannot describe it accurately in English) which one gets by listening to an array of 4 woofer pairs, listened again at 90dB. With arrays, bass has size and physicality – not only SPL level, as is the case with only one pair of woofers. But you know all that much better than me, because you are listening at bass arrays for years. The point is to have as much radiating surface through the vertical plane as possible.
I will move to live in my house in the province and I have quite a big room there, which I will use only for listening (it has solid floor and quite a good acoustics) so I can afford to put as much woofers as I want, and may be I will end up with 8 x 23” woofers in order to have very even bass response at my listening chair.

Lived for 10 years with first order and 78Hz, The room was in small and used 6 driver per side. I drive them single full bloated 6C33C with 5.3:1 if I am not mistaken. The woofer cabinets were a bit on over-damped side, the way how John Dunlavy used to like. I need to say that I did like the way bass sound a lot and I do not feel that it had any rubber taste. I truly did not. Among all drivers that I heard I would rather say that 25W has some foam suspension coloration but not exactly that. The 25W is strange driver and in my estimation it has no analogy. When it go into the “distortion mode” being overdriven then it sound in own manner, distorted buy pleasantly. I honestly say that I never consider the 25W driver as the weekend past of my playback and BTW my bass always was quite at high respect from anyone who hear my playback. It might not mean anything but I do feel that I have quite high expectation from bass. Sure the 8 x23” woofers would be much more interestng solution for ULF, particularly if the drivers are good but you see, the lower bass is NOT ONLY volume displacement but many other factors. Considering many of those factors and managing all of those factors are the key in proper bass reproduction. If you in your room can accommodate 8 x23” woofers in time align position and face them straight forward then you do have a hell of a listening room…

haralanov wrote:
I simply prefer speakers which do not have their own “intelligence” at/around their Fs.

This is a noble but controversial desire. If you true would like to accomplish it then dive your woofer with negative output impedance. But… you will feel a need to EQ drivers as no one makes the drivers that can work without reliance upon the Fs.

PS: haralanov, and everyone, I constantly ask people to do it. In the top of my gallery where you input imaged there is a note: “Attentions: before uploading, please, name your images identifiably.” Would you be so kind to comply? It is not my administrative wish, it is a necessity. The images are being uploaded to Site_Images directory if my server and as they accumulated it is getting too slow to open the gallery. So, I have a process that moves the User Images to the Site Images directory and updates the reference in the user posts. If you name your image too generic, in the way how your camera does it, like “DSC_1417.JPG” for instance, then when the image is moved to the Site Images directory with many thousands images then it might meet the existed image with the same name. I did not write a provision for it and I feel it is not too difficult for posters to mane own images with own unique name.

The Cat

Rerurn to Romy the Cat's Site