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  1. 30db drop from 20hz to 20khz??

    REW Forum
    Hi guys. I am just getting started with REW and was trying to get some baseline measurements done. The good news is my baseline setup looks pretty similar in shape to the recommended house curves. The odd thing is that no matter what I do with the speaker position, I get about a 30db drop...
  2. How do I bypass the built-in high pass 20HZ filter on my Crown XLS2000

    DIY Subwoofers - General Discussion
    Hello , I will be running two sealed boxes with JL audio 12W3-3-2 subwoofers, and 1 ported box with a JL audio 12W7-3 when the subwoofer boxes are completed . I will also be post pictures when their done. After a little research and additional information from another home theater shack...
  3. Is 20hz low enough

    Ported Subwoofer Build Projects
    OK I have 6.5 ft3 max I need to build soon. Looking for 15 or 18. Is 20 hz low enough I would like to hear the whole LFE or am I better off going sealed. I can't wait fot the new SI HT still probably at least 90 days out. Suggestions anyone Thanks Mike
  4. PB13-ultra 20hz vs 15hz - how loud ?

    Hi again ! Need to ask here again. I've switched countless of times between the 20 hz and the 15 hz modes on this great subwoofer. When in 20 hz - I get the feeling of much more power, hair moving experience in certain movies - eg live free and die hard - bridge collapsing from harrier rockets -...
  5. It's time to build a DIY Ported 20Hz- Sub, single 15" or 4x 8"

    Ported Subwoofer Build Projects
    So I'm looking to build my first DIY sub for my home theatre, I've build plenty of sub boxes for car audio in the long ago past but this is my first for a home. There are so many options out there now that I would love some feedback on some of the ideas I have and figure this thread can serve...
  6. Please help with VTF-15h/MFW15 , 20Hz peak and Room placement. Please help with VTF-15h and Room placement.

    Home Audio Subwoofers
    Hello! So I have a VTF-15H and MFW15 on one corner of the room which is sort of midway. I noticed while measuring where I sit that the 20Hz test registers about 73db. If I move closer to the front wall it keeps going lower and it I move to the back wall..it goes lower for a few feet then it goes...
  7. Soundcardcalibrations starts at 20hz?

    REW Forum
    Hey, iam a bit confused. Today i started calibrating my new Tascam US-122mkII: See Screenshot below and the text on the Left: Sample rate: 44100 Hz -3 dB points: 17,5 Hz, 21,126 kHz Input device: Eingang (TASCAM US-122 MKII) Input: No input selected Channel: Left Input volume: no control Input...
  8. unable to get results past 20hz

    REW Forum
    This is somewhat frustrating. Calibrated my xonar HDAV sound card and the calibration appeared to spit out fine as shown below, 1st image. But when I set the cal file to xonar for the sound card and radioshack for the mic I get this dropoff at 17hz, 2nd image. Changing both files to...
  9. 20hz to 80hz sweep, sound from center channell

    REW Forum
    When I run the test in the picture. I have sound coming from my center channell. How can that be? I have all speakers set to small and crossover set to 100hz.
  10. BFD - Parametric EQ below 20hz

    Electronic Processing/Equalization Devices
    Is there any way to EQ frequencies lower than 20hz with a BFD? It's been a while since I've used REW, but I just downloaded it again. I believe that you can EQ lower than 20 by selecting a frequency of 20 and then a Bandwidth (BW/60) of 25 to get 11.8hz for example? I know that you need to be...
  11. help me get my sub to 20hz

    DIY Subwoofers - General Discussion
    I recently built a new sub but made the mistake of useing a calculator from another site to determine port size. I have tried and tried to try and figure out how to use winsd but cant get it to work. The sub is 8cf with a 5" by 5" square port. The driver I used is the 15" Dayton HF with the...
  12. Low frequency absorption in a closet/pantry

    Home Audio Acoustics
    Hi, I have been researching how to reduce my decay time of the low frequencies( 100hz down to 30hz) in my room. I know these frequencies are VERY hard to tame because of size and all that. I have read master handbook of acoustics etc etc, plenty of mfg's education articles and videos, but...
  13. Odd room, with modes < 20Hz whose harmonics are showing up as well

    Home Audio Acoustics
    All, I swept our system with REW, and ended up getting a really ugly response. I did a near-field sweep of the sub as well, and it's pretty clear that the problems are almost entirely the house resonating (not just room, but house). See the waterfall at the end. The pink is the near-field...
  14. What’s better for sub 20hz output, (1) 18” or (2) 15” PRs?

    DIY Subwoofers - General Discussion
    With Kevin running a clearance sale on his PRs, I thought I should get off the fence and build something. I have procrastinated on a build not knowing what I really wanted. I toyed with many ideas, from just rebuilding my present Sonotube to going all out and building a new monster sub. The...
  15. Mach 5 18", 180lt, 500watts tuned to 20hz

    Ported Subwoofer Build Projects
    Can someone confirm that I have my numbers correct before I start my project. For the Box. Height: 790mm Width: 595mm Depth: 580mm Internal 221lt less Port, Bracing and Driver = 200lt For the slotted Port: Height: 51mm Width: 559mm Length: 923mm The box will made out of 18mm MDF with a...
  16. 25-31PCI 20Hz Need help!

    Ey guys, im new to this forum. I hope someone out there can help me with a problem I have with my new 25-31 PCI custom tuned to 20Hz. I have a very small room which is about 130 square feet. I replaced a new REL T1 because I wanted the DEEP bass a lot of SVS customers are raving about...
  17. Sub 20Hz EQ

    Electronic Processing/Equalization Devices
    With the 1124SP specification at 20Hz -3db, I presume sub 20Hz EQ is a :nono: I've been thinking about an upgrade to a PB12Plus/2 and tuning it for 16Hz because I appear to have significant room gain below 30Hz so a drop in overall SPL for a 16Hz tune would not have a significant effect IMO...
  18. On BFD 1124- Any way of adjusting below 20hz?

    Electronic Processing/Equalization Devices
    Just wondering if there was a way to adjust below 20hz or is that limited by the BFD?