klipsch

Brand new in box and never used B&C 21SW152-8 21-Inch 8 Ohm driver bought late last year.Highlights Lightweight but powerful FEA-optimized neodymium magnet Extremely high BL factor and Xmax for outstanding LF output 15 mm Xmax, 60 mm peak-to-peak excursion before damage 6.0" split winding copper voice coil on fiberglass former Ventilated voice coil gap reduces power compression Aluminum demodulation ring on pole piece reduces distortion Double silicone spider Product Specifications Nominal Diameter 21" Power Handling (RMS) 2,000 Watts Power Handling (max) 4,000 Watts Impedance 8 ohms Frequency Response 30 to 1,000 Hz Sensitivity 96 dB 1W/1m Voice Coil Diameter 6" $600 + shipping from south east PA

Mint D-Sonic amplifier from my theater. 800w @ 8ohms x 3 for the Left, Center, and Right channels 400w @ 8ohms x 4 for the surround channels Comes with all originally packaging and 20 amp power cord with standard wall plug. Included as well is a D-Sonic rackmount shelf. $3000 + split shipping costs Per D-Sonic: The D-Sonic M3a-4000-7 represents the sonic state of the art in multi-channel amplifier design. Featuring very powerful, high fidelity Class D modules fed by a best-in-class proprietary input circuit, the M3a-4000-7 is an impressively dynamic home theater amplifier. Owners can enjoy 800W of power for their left, right and center channels with vanishingly low distortion, iron-tight bass control and realistic soundstage, while still reserving 400W for each of the four surround channels. All 3-7channel units have 12VDC trigger circuits to allow standby, low energy dissipation when not in use. Manual, front panel shutoff is standard for ultimate safety and zero energy loss. Dimensions: 17.5”W x 18.5”D x 5.0”H. Add .63″ to height for standard feet, .25″ for rack mount feet. Weight: 52.00 LBS Power: 3 x 800W / 4 x 400W / 8Ω

I am dangerous enough with REW. What are you looking for or concerned with specifically? Measurements? Response? Filter simulation? Etc.

Thank you Ricci. Guess I should try to learn akabak and hornresp and such to get a better idea of what I should expect with experimentation. The tic tac toe pattern just seems easier to attach and remove. Maybe in practice, it is not. I still planned to put the small center circle in front of the dust cap as you've designed it. I was thinking of rotating the ckrams on their sides and using them as speaker stands.

@Ricci Instead of the "8 point star" design as the throat braces, would a "tic-tac-toe" pattern work as well? Something very rough like this?

I have experienced this with orbital shifters. There are videos with sheets waving in front of them from the air velocity. Looks cool, sounds like... To each their own.

Very interesting... Maybe more fasteners? Maybe some speaker seal/tape where the mesh meets the wood? Thanks for sharing the results. Good luck with your experimentation. And of course, Happy Belated Birthday

I saw quite a few extruded aluminum shapes pieces. Perhaps the extruded aluminum comes with those machines from the manufacturer. Many here in the States add the extruded aluminum for guides and fences as aftermarket enhancements. A few companies in the States use extruded aluminum as hobbyist / small business CNC bases.

It certainly did enough for me. The in-room measurements match quite well to the simulation too. Sadly I found the feature after I built and finished the riser for the second row.

Haha exactly. Using the room simulator in REW really helped me when I was designing / building my room. I originally had my first row of seating in a massively bad null area. Moved it forward 12 inches, got better... Moved it 18 inches and all nulls were basically removed. Moving the speakers did nothing in the simulation as that spot in the room was just a bad room node spot based on dimensions. Adding different treatments helped that original location's response, but why start with something poor like that if you don't have too?

How well has the extruded aluminum worked for you? I've heard good things...

How well would these integrate with the skrams and skhorns if they are all overlapping the same frequencies? Asking for a friend...

That's what I love about this hobby. Such difference in variations. In my room, I do not have that rolloff with my sh50s. I'm a fan of horns and metal tweeters. I loved the flagship titanium mb quart component system I put in my first car 20 years ago. Still miss it. However, when I heard the big bad towering and impressive looking JTRs, it was the first time I understood ear fatigue and "tinny-ness" I had read about on the forums for decades from people who did not like Klipsch speakers. Was it the room? The seating position? The source? The amp? Etc? I do not know, but I will absolutely jump at the chance again to hear the JTRs to try and understand the variations of opinions and how mine were so different.

Yes. I am pretty sure the Yorkville unity designs have been out of production for years. Yorkville refers to the unity series as Legacy on their website. However, I have seen them available on different sites in the States (marked as New). Perhaps there is still stock out there? Diyaudio guys have cloned the unity horn section with success. A guy not far from me ran / is still running the passive version of the 215s. He is Gorilla83 on AVS. Back in 2014 there was a good GTG at his place. The 215s were very good. I thought they were much better than the big equivalent JTRs that we heard in his room as well. I'm pushing my 4th decade and while I treat my hearing with care, I cannot hear above 18khz anymore. I thought the Danley speakers usually have an upper rolloff despite the compression driver they use VS dialed hot HF. My ears enjoy them from about 13 feet away. However, I do run them through a minidsp and have added 3 or 4 few PEQs. Beastaudio in AVS, had sm60fs. He eventually went to 50s. Now he has JBL cinema style speakers. Maybe he can help as well with your questions. He had an skhorn now as well.

I was thinking it would be great to have a functional speaker stand. The dimensions of this ckram would work quite well. Looking forward to a FR graph. Thanks for sharing Ricci!

I did some experimenting last night. In my room, the skrams have a large bump between 30 and 40 hz at the mlp. About 16db with both skrams running. I had put in a high shelf of - 8db from 20hz on both boxes to get a response that is flat, +-2db, from 10hz to 55hz before beginning to slope down 10db to the mains. Last night I removed 4db from the shelf/added 4db back. That gave me a nice crest in the 30hz to 40hz range of around 8db. For music, I really enjoyed the increased chest punch and it did not sound unnatural for a a wide variety of genres. I also played around more with the port blocking. The air movement got quite pronounced when running 10db hot VS the mains. It's been years since I've run anything but sealed, so maybe pronounced is the wrong word. So typically, I run the sub channel hot around 10db with a slope similar to the pictures you share. If my mains are at 75db, the subs are at 85db or slightly higher with some music (e.g. Blues).

Agreed! Bondo works wonders... "putty and paint makes it what it ain't"

That's a mean looking monster stack in that picture! I like it! You should decorate that beast during Halloween and scare the trick or treaters. Just did a nice hour long listening session of pretty much every genre of music that exists. Finally got my first clipping/signal light to show up on the 20000q clone amp driving these skrams in a Gorgon City mix called "FTPA". The last bit of that song pushes out what feels like 30hz tones on crack. Pretty sure the skrams laughed at me, and said, "is that all?" Crystal clear and visceral.

A few of us have sh50s and skrams. One even has sh50s, skrams, and skhorn 😲. There's also an individual that had sh50s for LR with a sh96 as a C who now has one skhorn. I think the quote you shared explains things quite well. All I could do is reiterate that with a different subjective contribution. The synergy horn design is marketed as a true point source. They do magical things for my ears in my room. Combined with some skrams and the only thing I may end up changing is adding more skrams. I have 2 extra channels on this Amp that aren't beigg used right now, so that's just a waste, right? If you have an opportunity to listen to any synergy horn, I highly recommend it. Danley allowed the unity horn to be implemented by Yorkville. There was a u15 and a u215 IIRC (passive and active versions). Those designs were not full point source as the bass was handled by drivers outside of the unity horn. However, they can still be found and are usually not too expensive. Could be another option to pursue in hearing a danley loudspeaker design.

I know nothing. Will be interesting to see your learnings.

Did a test of one skram in my room with different port tuning with high pass bypassed and no PEQ. Low power and gain test with the mic at my MLP; -20.0 on pre/pro and MLP is about 14.5 feet from the skram. There are room nodes/nulls to account for, but hopefully this gives an idea of port tuning response of the skrams.

I have 2 channels left unused on this sinbosen Amp...😧

Start building two more now and thank me next week after these two are operational. They're like the Lay's potato chips slogan

Ground VS grounded VS grounding... those terms are many times used interchangeably and they should not be used that way

Haha I can read it that way too. That could be the lazy way to turn off the breaker instead of going to the panel