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xtrmaniac

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About xtrmaniac

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  1. xtrmaniac

    Diy Subwoofer

    Based on your suggestions I made the room treatment by adding 6 acoustic panels - 2 behind the mains, 2 on the back of the sofa and 2 on the ceiling. The improvement is huge, it's infinite better than before. I intend to use and buy corner traps later on due to the aesthetic look, hopefully before connecting the subs however for 100$ each this will wait for a while. I have attached how the drivers model in this size enclosure. The simulation was done with 2 drivers adjusting the enclosure size and had the parameters taken from TC sounds website were their specifications were made for dual voice-coil wired in parallel. Because the specifications are only for voice-coil wired in parallel I should consider to have them connected like this and both drivers from each cabinet should be connected in series? Thank you for your advise, I will connect them separately into the amp. Daniel
  2. xtrmaniac

    Diy Subwoofer

    Good morning Gentlemen, It's been a busy year and it's been a while since I updated this topic. First of all I will like to Thank you JSS and nube that they gave me so very generously of their time, knowledge, and patience to understand what I need to build a new pair of subwoofers and to enclose them in a room which was treated. Even if the thread began with a statement, I discovered that there are only a handful of drivers that could comply with a 3 cubic feet enclosure and to be on a budget. This year Christmas came a little earlier than anticipated and now I am the happy buyer of 4 x TC Sounds Epic 12" drivers. I have some details about what I have in mind for building the subs and everybody's feedback is welcomed. - 4 x TC sounds Epic 12" drivers in dual opposed cabinets design with inside measurements of 23 x 16 x 16 ~ 3.41 cubic feet from MDF, - 1 x Behringer EP4000 amplifier which I intend to connect the subs in bridge mode - 1 x miniDSP 2x4 + plugin + UMIK-1 mic setup with REW software and Linkwitz Transform for fine tuning - The drivers will have 2 + 2 ohms dual voice-coil in series connected, then the drivers will be connected in parallel in the same cabinet and the last thing the subs will be connected in series to the amplifier to have 4 ohms at the bridge mode - correct me if I'm wrong - 1 lb acoustic poly fill in each cabinet - 2" standoff from the floor and a 1/2" beveled glass top plate installed at 2" above the driver - This is my conclusion, please let me know if I should review the measurements - Looking as black mirror finish furniture It seems that this is becoming more like a habit to build speakers during winter however I'm very excited to start and hopefully I will finish them in a timely manner. I will update as soon as I will have new details. All the best, Daniel
  3. Thanks a lot nube for Megamind and Kung Fu Panda. Both of them are terrific animation movies. These 2 are on my favorite list where I can actually hear the surround system.
  4. xtrmaniac

    Diy Subwoofer

    Good morning, This is the mic used by Anthem. The storage that I have for this thread is drastically reduced and I cannot attached more files but the link below should tell more about the mic used. www.anthemav.com/downloads/ARC-1_PDS.pdf
  5. xtrmaniac

    Diy Subwoofer

    Thank you for the answers in the thread. They helped me a lot and I really appreciate your feedback. I will keep the thread updated when I will start building the subwoofers and with the new results but for now I will go off-topic just for the following problem. In the meantime the high frequency on Surrounds was improved. I adjusted the crossover from the AVR (at 100Hz), distance position, I used a decibel meter and some other details and now is playing very smoothly, the sound travel clear and clean. Ratatouille, Oblivion and Act of Valor can tell a story now After taking the latest distance measurements, the center is situated at 8ft from the center listening position. The Towers are at 9ft and the right surround at 11ft and the left one is at 10ft. The distance between the wall and the speaker is around 1ft or less. The room treatment is not yet finished. I plan to add acoustic panels behind each Tower and 2 acoustic panels behind the sofa, however after seeing the latest graphs which are attached, perhaps I should reconsider the number of acoustic panels. In the file attached, on the first pages the measurements are from Anthem software (red - measured / black - target / blue - calculated) after all the details were worked out and the rest of the measurements are done by REW. I've used the mic from the Anthem (ARC-1 Anthem) which I used it in REW as it is, without calibration. The .cal file present in the AVR software didn't work and I don't have the specifications of the mic for now. The connections were made using the USB port for the mic and the laptop HDMI output connecting the AVR. The tutorial suggested that I should use a -12dB level on the signal generator but it was too loud and it was reaching the sound distortion. Then I change it to -16dB. Instead of 75dB on SPL meter I was using 72dB with -20dBRef. This gave me something between 2-4dB HeadRoom. All the graphs were taken only on the listening position mentioned above with the mic in omni position. My curiosity paid off since the high freq were quite good compared with Anthem graphs, at least on the surrounds but I saw 2 cancellations at 4kHz and 12kHz. The left Tower is shifted with 1kHz to the right. I played some focal wave sounds at 3k, 4k, 5k, 10k, 12.5k, 16k and I didn't hear if there were something wrong there. The voice frequency sounds great when I'm watching movies or listening to music. That makes me think the mic has a problem but used in the Anthem software which have a calibration file, the mic seemed to be fine, or there is something wrong with the room and I need to hurry with the room acoustic treatment or I missed something when I was setting up the REW or is just a glitch. I repeated 2 times the measurements with the same result. What is your opinion about this? Definitely I need to have accurate graphs using a calibrated mic as UMIK-1 and to change the mic positions for more details, but it raised some questions and I don't know if I should be worried or not. Compared with the results from the ARC Anthem I shouldn't. Also, based on the impulse graph, could you please tell me if I should add acoustic panels behind the surround speakers? These are the settings used for REW. Please let me know if I should change them. 2 Sweeps -16dB FS level (should I change the value?) -20dBRef - I have got around 72dB on SPL meter 2-4dB Headroom - should I use more headroom? All the best, PS: I have read about the xls sheet in the Low Content Thread. I still need to compare the new values from the forum with the old ones from the excel file in order to adjust it. I should share it as it is or I should wait? I incline to wait until everything is settled. Please let me know your feedback. Frequency Response_resize.pdf
  6. xtrmaniac

    Diy Subwoofer

    Thank you JSS! These examples will bringing me closer to decide what I should build. Definitely going with Infinity drivers in 2 folded horns will be the most economical choice, however I was looking also into the TC Sounds Epic, Dayton Reference HF, Dayton Ultimax and FI SSD 12" and I simulated them in the WinISD. Please find enclosed the screenshot taken from the project where I uploaded 6 different 12" drivers. 2 Ultimax drivers it will give me around 6 cubic feet in a sealed enclosure and for my requirements it will not work. Great driver though. Also Dayton Reference HO seems to have good values in WinISD. The only problem is that it's hard to decide which driver I should choose based on values, volume and reviews and a good advice will be most welcomed regarding this. You are right about popalock's videos show. I didn't intend to have them in the same category, I was just amazed about that and I know that I could even get closer to something similar. I've read that actually there 16 of SI 18" which is a lot of displacement. Thanks a lot! I will place the corner traps on the front corners. All the best,
  7. xtrmaniac

    Diy Subwoofer

    Thank you for your reply JSS! I don't recall to have cinema processing setting on Anthem, but I will take another look. The menu settings is pretty straight forward. About checking now the x-overs, that it will be a little bit impossible. I tested them before installing them in the enclosures several times. Even when they were installed in the cabinet without gluing the last piece of the enclosure, they sounded ok as I could hear that x-over is working and they are wired correctly. This is my first diy sound system and I didn't want any surprises. I did though boosted the surround with +3dB in the AVR and watching HTTYD, Kung Fu Panda, I was somehow surprised about the sound effects in the surround speakers at -20dBRef, but I still have a feeling that something is missing. Definitely, if there is a problem there I would like to check it out but now I'm a little bit confused. Thank you for guiding me in choosing a design for the subwoofers. The 4x12" drivers will be my best option in the room and I will go with dual opposed design which will give me the best solution: space, going below 15Hz and used them as furniture as you said before. But having multiple sealed drivers in the nearfield firing into the seat-backs is not bad at all. It's just bringing me a good feeling and a smile when I'm watching something like this: I assume that a 12" driver has around 1 cubic feet volume in a sealed box that means the enclosure should have around 2-2.5 cubic feet volume with the driver displacement and bracing. In this case could you please tell me if there is a good 12" driver which could meet my requirements without breaking the bank? About acoustic treatment, I'm already working at this. Hopefully, soon I will finish this and do another calibration of the sound in the room.
  8. Good morning, I really appreciate the content of this topic. I want to take this opportunity to thanks everybody for everything that I found on this thread. The information and the details here are very useful. It's giving me another perspective to look through the movies and I don't look into other bass threads anymore. After finishing the Cinema Room and the sound system I was watching some movies and I found the sound mix interesting. I don't know if the following movies were ever discussed in the thread but perhaps could be added in the queue. Gangster Squad Knight and Day Losers The A-team Megamind All the best,
  9. xtrmaniac

    Diy Subwoofer

    Hello, I lost the track of time with the sound system project this winter. However in the meantime I had the chance to finish reading what JSS have share it and I can say that I'm little bit more educated. Definitely I would like to buy the book from Floyd E. Toole, because I'm sure that I will find more interesting details there. To sum up, I just finished the 5.0 sound system and I took a day off just to hear the music, listen a SACD, watch a movie or two...actually I will watch at least half of the BDs that I have just to review the movie experience and I need to say that is unbelievable. The dialogue in the Inglorious Basterds movie is awesome, clean and clear, same as goes with the effects from Gangster Squad, How to train your dragon, The A-team, Losers, Knight and day, etc. It's more than clean and clear sound, it's a whole new experience of everything. As advertised the high frequencies are crystal clear, open and warm middle ranges and accurate bass. This system will be doing great as it is for movies that are filtered at 30Hz. And btw JSS, I never doubt it and you were right about "How low do you want to replicate? How loud? I think you will be SPL limited by your Mains, Center and Surrounds, and I do not think clean reference level will be possible as they appear to be lower sensitivity speakers. The dual-tweeter center was a curious design choice. With ~87dB sensitivity, and a ~3m listening distance, you are looking at around 95-100dB maximum at the listening positions from them before distortion becomes unbearable. That means you have a -10dB to -5dB system." Now I can answer this question and I can say that it's more than enough. Until it reaches the distortion it can get loud enough for my ears, even pass my expectations. Definitely will be better with subs but for now it will do it. Please find below the link where the pictures are stored. https://picasaweb.google.com/109879731661334647680/074DIYSpeakers1618SonyH50B?authkey=Gv1sRgCOvlibvfrJaPgQE#5981989225038554018 The room is not yet finished. It needs acoustic panels and corner traps. Regarding the corner traps, I would like to know if I should use them between the ceiling and the wall and how should be distributed? I've read a case study from Ryan O. Allen about Acoustical Concepts and he recommended to be used. Based on the room measurements I'm inclined to go only with corner traps at the wall corners and acoustical panels. I would like to receive your feedback about it. In my quest of finding what is the best and appropriate subs for my Cinema Room I found that I'm still not decided which subwoofer will work there. I had a discussion with nube and I was asking him for more details about his design and I would like to thank him for taking his time and patience to share his experience. He also recommended to use TC sound drivers since they use less cubic feet than FI SSD15" to have great performances. The design of 2 dual opposed drivers is great but I'm not very sure if going with that will not be too much. The space available there is not that much as you have seen in the updated layout. Central is at the distance of 10-12 feet and the surround between 15-16 ft from the listening point. And I have between 2.5 and 3 cubic feet to spare between the sofa and the chair to be used as side tables no more higher than 24". And I have only 2 areas to use for that. Also I could compensate at some point with "bass shakers" for the feeling below 15Hz I agree that I need more space to develop a real home cinema, however in this case I need to work with what I have and I will appreciate your advice. Please find attached the frequency response on each speaker after calibrating with ARC from Anthem. I think they are pretty good. The only thing that is concerning me are the surrounds. The volume is almost 0.7 cubic feet in a sealed enclosures. I attached the schematic. As per surround graphs the response is dropping dramatically after 6kHz. Hopefully I didn't mess with anything and that is everything that I could squeeze from them. All the best,
  10. xtrmaniac

    Diy Subwoofer

    Thank you very much for your answers! I got the power back, after 7 days, so everything that I postponed, I need to do it in the next couple of days. I will have more questions soon but until then, have a great week and Happy New Year!
  11. xtrmaniac

    Diy Subwoofer

    Thank you for all the details! At some point I would like to resume how to improve the room with corner traps and absorption panels since I'm a little bit confused. I still need to finish reading those 2 web-links sent. Definitely I will ask more questions as I progress with everything, I regret the late answer but I was busy building the speakers and unfortunately our house was in the path of the Ice storm. We have already a power outage which is lasting for almost 2 days. Nothing major happened only couple of tree branches felt on the driveway. Anyway we expect to have the power restored as soon as possible. I have some question off-topic about building the speakers. How do you keep the damping material away from the drivers? I bought something like this: http://www.parts-express.com/acousta-stuf-polyfill-speaker-cabinet-damping-material-5-lb-bag--260-330 The tweeter speakers didn't come with a gasket. I didn't expect that. So I need to go to a store to buy something. Can I replace the rubber gasket with something else? What do you recommend me? There is a space cut under the tweeter for polarity connections. How and with what should I fill that space?
  12. xtrmaniac

    Diy Subwoofer

    Thank you maxmercy! I'm looking forward to receiving your reply. When you will have a chance, could you recommend me a corner trap model? There are only 2 corners on the left wall, I don't know if I should install something at the bottom of stairs (behind the rear speaker) and on the corner under the stairs where is a closet door. I found nube's thread on AVS forum and I'm really impressed, the enclosure looks very well-constructed. I just have to figure out if there are similar drivers that I could use for my project without affecting their performance, because I didn’t find SSD-15" drivers on parts-express or solen.ca. Reading your last line, I just want to confirm with you if 1xEP4000 should be enough without needing an EQ for near field subwoofers in this setup.
  13. xtrmaniac

    Diy Subwoofer

    I agree with you about room treatment. However, I am intrigued if sound and safe insulation added in the ceiling and in the wall behind the TV stand plays any role in sound absorption? I thought/hoped the insulation will do the trick. I am wondering if I should install absorption panels on the entire wall or should I focused on a certain areas. Could you please advise what is the best way to determine the panel size in my case? I'm not a subwoofer connoisseur but I think I will go with near field subs. Last time you mentioned that I should have 115-120dB at the seats from subs to match the LCRS. How can I do that? Can you please guide me to some DIY near field subs designs / schematics? I didn't do my homework about this and I would like to study what are the requirements in order to build such subs. My goal would be to go below 15Hz. All the best, xtrmaniac
  14. xtrmaniac

    Diy Subwoofer

    Thanks for letting me know!
  15. xtrmaniac

    Diy Subwoofer

    Hello, The updated layout is attached. layout_v2.pdf
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