Dear @lewm : I had the opportunity to listened the IMF speakers that were transmission line design and I always ( even today ) remember that " dreaming " kind of bass range quality performance. Extraordinary.
R.
System that sounds so real it is easy to mistaken it is not live
My current stereo system consists of Oracle turntable with SME IV tonearm, Dynavector XV cartridge feeding Manley Steelhead and two Snappers monoblocks running 15" Tannoy Super Gold Monitors. Half of vinyl records are 45 RMP and were purchased new from Blue Note, AP, MoFI, IMPEX and some others. While some records play better than others none of them make my system sound as good as a live band I happened to see yesterday right on a street. The musicians played at the front of outdoor restaurant. There was a bass guitar, a drummer, a keyboard and a singer. The electric bass guitar was connected to some portable floor speaker and drums were not amplified. The sound of this live music, the sharpness and punch of it, the sound of real drums, the cymbals, the deepness, thunder-like sound of bass guitar coming from probably $500 dollars speaker was simply mind blowing. There is a lot of audiophile gear out there. Some sound better than others. Have you ever listened to a stereo system that produced a sound that would make you believe it was a real live music or live band performance at front of you?
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@rauliruegas just because a sub is a balanced force design does not necessarily mean it is going to be good. It depends on the quality of the drivers and the construction of the enclosure. All internal bracing does is change the frequency of the resonance. Play a 20 Hertz test tone at 90 dB and not only will your sub be shaking but so will the whole house. There is no coating you can put on a sub that will keep this from happening. There is no subwoofer enclosure made of MDF that can perform at the state of the art. Next using a subwoofer with a two way crossover under a 3 way dynamic system will relieve the system's woofer from taking long excursions which will keep it in a more linear zone of operation lowering distortion and Doppler effect of the woofer. If any of the woofer's "upper harmonics" are getting through to the rest of the loudspeaker someone really f-ed up on the design of the woofer to midrange crossover. In which case I would toss that loudspeaker and buy another one. The reason that using a subwoofer under an ESL is because there is only one driver thus, keeping it from taking long excursions cleans up everything and allows it to go VERY LOUD. And because it is a full range line source it sounds VERY BIG just like a real rock and roll concert. Raul, I have been building and designing subwoofers for 40 years. I think it is also pretty obvious that I am very talented cabinetmaker with enough equipment to open a commercial shop. I am building what I think will be the worlds finest subwoofer. You could at least wish me good luck. |
Dear @mijostyn : " 90 dB and not only will your sub be shaking but so will the whole house. " , not in my place.
" If any of the woofer's "upper harmonics" are getting through to the rest of the loudspeaker someone really f-ed up on the design of the woofer to midrange crossover. ", that's not what I said.
" dynamic system will relieve the system's woofer from taking long excursions which will keep it in a more linear zone of operation lowering distortion and Doppler effect of the woofer. " this is what I'm saying and this effect means the IMD goes lower and that permits the mdYhi frequencies been listened with new clarity/transparency and the like.
Good luck. When will be in the market?
R. |
Mijo, In a distant way, there is a relationship between a transmission line and a dipole design, or whatever you call the type where two woofers are working in or out of phase, back to front or front to front. The transmission line is akin to an open baffle where the rear radiation is used to augment the very low frequency bass output by undergoing a phase change in the course of passing through the transmission line and out through the port at the base. But the cabinet does not damp the motion of the woofer, as in open baffle. Raul, I was a lowly intern when I first heard the IMF Monitor at Lyric Hi-Fi in NYC. I wanted that speaker very badly but could not afford what seemed to be the stupendous price at the time, $1000 I think. I had a patient who offered me the use of his bench saw, so I bought the HDF, clamps, glue, drill, etc, and built the transmission line exactly according to the IMF Monitor, which was based on a published paper in a British journal called "Wireless World". A guy named Bailey described the TL in one issue of the journal and gave all information needed to make the cabinet using a KEF B139 woofer. Then my home-made version used a KEF B100 midrange, as in the Monitor, and RTR Electrostatic tweeters, 4 per side, that I bought from a guy in CA who was associated with Infinity, which was then making the Servo-Statik 1. The problem then was that I knew nothing about crossover design. I got some help with that from an MIT-trained engineer who worked for NSA here in the DC area. I eventually sold the speakers to my cousin, and then bought them back from him about 20 years later. I cut off the midrange and tweeters and saved the TL woofer cabinet, which I now use along with the Beveridge 2SW, as the outboard woofers. |
People have been fooled for for quite a few decades. Even by Edison! ie: https://phonographia.com/Factola/Edison%20Tone%20Tests.htm |
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