Very nice.
I like Seas drivers as well, but also Eton Symphony’s, and Scan Speak Revelators.
I like Seas drivers as well, but also Eton Symphony’s, and Scan Speak Revelators.
A full range speaker?
Many claim to be, but how many can handle a full orchestra’s range?
That range is from 26hz to around 12khz including harmonics, but the speakers that can go that low are few and far between. That is a shame, since the grand piano, one of the center points of many orchestral and symphonic performances, needs that lower range to produce a low A fully, however little that key is used.
I used to think it was 32hz, which would handle a Hammond B-3’s full keyboard, so cover most of the musical instruments range, but since having subs have realized how much I am missing without those going down to 25hz with no db’s down.
What would you set as the lower limit of music reproduction for a speaker to be called full range?
I’m asking you to consider that point where that measurement is -0db’s, which is always different from published spec's.
That range is from 26hz to around 12khz including harmonics, but the speakers that can go that low are few and far between. That is a shame, since the grand piano, one of the center points of many orchestral and symphonic performances, needs that lower range to produce a low A fully, however little that key is used.
I used to think it was 32hz, which would handle a Hammond B-3’s full keyboard, so cover most of the musical instruments range, but since having subs have realized how much I am missing without those going down to 25hz with no db’s down.
What would you set as the lower limit of music reproduction for a speaker to be called full range?
I’m asking you to consider that point where that measurement is -0db’s, which is always different from published spec's.
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- 196 posts total
william53b OP166 posts08-05-2021 11:35amVery nice. I like Seas drivers as well, but also Eton Symphony’s, and Scan Speak Revelators. ~~~~~~~~~~~~~~~~~~ Troel Gravesen uses both Eton and scan's, both excellent speakers,, Here is my brief biase and heavy prejudiced review of the build on the DL 6.5 which just arrived, Tech is out of shop, so a listen will have to wait til tomorrow . I did say BIASEd and PRE-judiced. https://www.youtube.com/watch?v=YAFNVCXk93Y |
Concentric vs Single driver Whizzer AND Phase Plugs Whizzer cones have an effect, a lot lower than 7Khz. If you compare the response of the speaker with and without the whizzer cone, not just the frequencies where the whizzer is the sole source of sound. An 8" driver with 160mm cone and 80mm horn shaped whizzer with and without whizzer, was tested. They found the whizzer cone starts to have a large effect on the off axis response as low as 2.5Khz. Specifically the presence of the whizzer cone reduced the on axis response from 2.5Khz to about 6Khz by nearly 3dB, but increased the (30 degree) off axis response by several dB. The dispersion between 2.5Khz and 6Khz was greatly improved at the expense of -1db loss of on axis response. On axis response without the whizzer actually had a +3dB shelf from 2.5Khz to 6Khz, which suggests the main cone of the driver was designed with an increased output in this range (a slight convexed taper) so the response was balanced once the whizzer was placed. Above 7Khz the response of the single main cone by itself disappears. At 7Khz the output is almost entirely the whizzer cone. So technically the whizzer is only acting as a second separate cone above 7Khz, but between 2.5Khz and 7Khz it is still acting as a source of sound as well as a directivity modifier for the main cone. The improvement in dispersion is so great that at 4Khz without whizzer cone the 30 degree off axis response was -9dB with on axis response (severe beaming). With the whizzer cone in place the 30 degree off axis response at 4Khz was only -1.8dB from the on axis response... Now think concentric driver with a whizzer for better off axis and phase plug for back wave distortion reduction. My question is can you still keep the acoustic center of the two drivers and use the correct phase plug to stop the back wave (BASS), from the rear/side walls first reflection. Hypothetically the HF driver would have to be set inside the phase plug or Open Baffle the HF driver backwards.. (I’ve seen that).. and it works if the rest of the driver system is in a box, bipoled the opposite direction. (I haven’t seen that) What I’ve seen and herd though was BOTH sides of the driver were in an open baffle. So it was dipole for the bass and bipole for the HF driver (it had it’s own chamber) and it was facing the front wall.. A nightmare to get the timing right. The acoustic center only stay aligned, IF the driver and structure are placed in a chamber, I don’t think you could get it to work correctly in a listening room. Maybe.. within 1/2" to get it right.. 3 years I worked with the old GRs at a buddies.. 90s. (Super Wedge or something). He gave up.. I didn’t have much of a choice. Regards |
Now think concentric driver with a whizzer for better off axis and phase plug for back wave distortion reduction. My question is can you still keep the acoustic center of the two drivers and use the correct phase plug to stop the back wave (BASS), from the rear/side walls first reflection. Hypothetically the HF driver would have to be set inside the phase plug or Open Baffle the HF driver backwards.. (I’ve seen that).. and it works if the rest of the driver system is in a box, bipoled the opposite direction. (I haven’t seen that) ~~~~~~~~~~~~~~~~~~~~~ Wayyy over my head, btw what is ~~~HF~~~ I really have no idea what you are descriving. Anyway. My DavidLouis 6.5 whizzer wide band just arrived , Up N running. Very nice gain over the DL4 incher wide band. Added some bass, , mids are claener, highs not rolled off. = A WINNER. $450 includes ship The Crescendo/Seas wasa HUGEEEE disappointment, Seas claims 92db, My tech hook it to his sens gadget,, maybe 85db, when i hooked it up to a Mundorf 2.2 Supreme cap,,I COULD HARDLY HEAR IT ,, I;d say its more like 83db,,which means I have to ship it off to madisound for testing,, No way seas would lie.. We will find out if something is wrong,,Bought it as new off ebay auction, Anyway,,I'd say this DL 6.5 is the very best wide band in production versus\ Fesatrex, AER Voxativ. Yep, thats my 2 cent opinion, The DL at $450, needing NO HORN cabinet, just a 12 inch x 12 inch x 12 inch sanded ply from Home Depot, cut in 4 1 inch port hole at each corner = and you have a $20 cabinet. I just feel the big 3 labs will not hold up against the DL 6.5. No have not heard the big 3 , all models,, only the Vox AC1A, The DL completely totally annihilates and destroys the Voxatiiv AC1A 's @ $2k. Davidlouis Gold Standard in Wide band. I'd take this DL6.5 over any Wislon and Vandersteen Enjoy Some tech geek in china, knows how to build a wide band. https://www.youtube.com/watch?v=-h8TRoILZEg |
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