How to reduce port noise simply and effectively // ported subwoofer retuning // loud 35 Hz burp скачать в хорошем качестве

How to reduce port noise simply and effectively // ported subwoofer retuning // loud 35 Hz burp

The sub in this video is my Koda SW-850 8 inch (200 mm) 60 Watts RMS active home-HiFi / home theater subwoofer. Nowdays this exact model of this sub is discontinued, but there are newer generations of this sub on the market. First, I do not made a video before making these changes, because my smartphone's microphones are not enough sensitive and / or widerange to catch effectively / cleanly the differences at a so low frequencies at an SPL level like this sub can produce in my room. Second: the rattling noises are coming from the stuff, and / or from the furniture in my room 🙂 I wrote in my previous video's description that the transformer is mounted next to the port's internal ending, but now I know that it is mounted enough far from the port's internal ending to not cause these noises. So, these noises caused the missing internal flare (needed when the vent air velocity is so high like this sub's on it's almost whole soundrange - you can see while I play music) + the small amount of glue around the port (not airtight) - maybe just only a manufacturing defect which was just only on mine exact piece of these subs. After making these changes, I can say that all unwanted cuffing and hissing noises are reduced like by 90 percent without the external port extension. Yes, there are still some noises: port noise and other hissing noises are still noticabe when I push the sub near to it's limits (as you can hear in this video). On a sub with so high vent air velocity like this is basically no chance to completely cancel the port noise without "pro" things. On "normal" music / average sound volume these noises are not noticable (the hissing noises are coming just only from the sub's back: RCA inputs, switches potentiometers, etc... on the sub's integrated amp's control panel are not ideally airtight). Also on my previous video you can hear that the port noise is less with the port extension because of the flare I made for it using a sponge. With the port extension + with these changes I show you in this video, the noises were reduced let's say by 50 percent more compared to the previous condition (before these changes). So, with this port extension I can reduce the port noise even more if I make a flare on it which extends like 50 mm from the port's ending - using similar sponge of course, but I will not do that, because a flare like this lowers tuning frequency a little bit more, and probably the sub will bottom out a bit at like 40 / 45+ or 50+ Hz frequencies. So, the flare I made, lowered the tuning frequency a bit: originally it was 40 Hz, now it is 1.something Hz lower - between 38 and 39 Hz without the extension. With extension: before it was 26 Hz, now is few tenths lower - between 25 and 26 Hz - this is enough to not bottom it out at any frequency down to 20 Hz. Interesting things: the speaker flex is almost ideally equal at 32 Hz with and without the port extension, and this sub have a loud sound peak at 35 Hz in my room 🙂 , moreower at this 35 Hz doesn't matters that the port extension is used or not 🙂 - same windy and same loud, little bit different speaker flex... I've done just the burp with 35 Hz, because the furniture and other stuff starts to rattle somehow delayed (I don't know why), and on music it is just not so effective... I made an identical port extension for this sub too which is in this video using the second half of that pipe which I used for making port extension for my Logitech Z-623. The extension's dimensions you can find in this video's description:    • Logitech Z-623 - very simple subwoofer re ...   . How you find the tuning frequency: in theory at similar simpe ported (bass reflex) subwoofer enclosures like this in this video, the tuning frequency is that frequency at which the speaker's cone moves the least on the official sub-bass range (between 20 and 60 Hz). The tone generator I used you can download from here: https://www.nch.com.au/tonegen/index.... . The burps I've done with switched off EQ + switched off all sound enhacements, for music I switched on my EQ. How to install the EQ I use is in this video:    • Installing Equalizer APO and PC Equalizer ...   , download links also in it's description. For the music tracks I played you find a download link in this video's description:    • BigPimpin91 - 27hz Bass Track   . Intro music is from youtube audio library: DJ Freedem - Life After Death. Video parts: 0:00 - Changes on the port 0:35 - 20 Hz burp 1:00 - 25-26 Hz burp 1:35 - 32 Hz burp 2:10 - 38-39 Hz burp 2:50 - 60 Hz burp 3:18 - Burps end 3:35 - Music list 3:50 - 25 Hz music 4:53 - 26 Hz music 6:07 - 32 Hz music 7:15 - 38 Hz music 8:06 - 39 Hz music 9:24 - Rattling the furniture with 35 Hz 🙂 Thanks for watching 🙂