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    Type: Posts; User: Tall-person

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      Mark - Here are the background levels with the...

      Mark - Here are the background levels with the doors closed and everything off. Comparing this to any of the others above, I would say that I do have 40db between background and 500-1k....
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      I would add Mark that when I tested the levels...

      I would add Mark that when I tested the levels before with pink noise, the volume was over half way, so I will check again the background baseline and go from there.
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      No that's something I might try at the...

      No that's something I might try at the weekend.....I have messed with the levels somewhat and it varies by track on Spotify so I don't think that helps either. I did consider the rockford fosgate PEX...
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      Thanks Mark. I haven't yet found a happy medium...

      Thanks Mark. I haven't yet found a happy medium with the equaliser settings and it's either too quiet on the road or quite peaky, the bass roll off can be noticeable. I just had a thought as to...
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      Hi Mark, i think i may have misinterpreted the...

      Hi Mark, i think i may have misinterpreted the amp wiring block colours and got my signal polarity reversed. You said the wires are white and grey with black stripes on pins 1, 3, 9 and 11 of the...
    6. Volvo need to sort out the USB media...

      Volvo need to sort out the USB media functionality and the ability to recognise compilations as albums rather than individual tracks. It's fine for single artist albums, the album shows as one with...
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      Thanks Mark. With these graphs I was taking the...

      Thanks Mark. With these graphs I was taking the readings in the car with engine off, doors closed and volume just over half way.....the pink noise sample from Dynaudio website was an uncorrelated...
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      Hello again Mark. After doing that last set of...

      Hello again Mark. After doing that last set of tests, I picked up a decent external microphone and repeated the tests with the same software. As before, the brown line is the peak hold line.
      a - All...
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      Mark - downloaded a free Android based RTA tool,...

      Mark - downloaded a free Android based RTA tool, which has given different results to yours. See what you think of these graphs. I've just bought an external mic, so may try again in the morning and...
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      2018 XC60 DIY Subwoofer Project

      Hi guys, this might be of interest and maybe I posted it in the wrong part of the forum for those searching under audio, but anyway, here is the link to my under cargo tray subwoofer build for my...
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      Hi PSamy - Thanks! I have the stock audio system,...

      Hi PSamy - Thanks! I have the stock audio system, as I bought the car a year old so couldn't choose options....to be fair, the standard audio system isn't bad, but I'm sure the upgrades are very...
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      Thanks Mark, I will get the app and work through...

      Thanks Mark, I will get the app and work through that over the weekend if I can...
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      Mark, also with the factory amplifier, it doesn't...

      Mark, also with the factory amplifier, it doesn't have the extra equaliser bands that the better amp with the sub out has so it think it's a five band equaliser with 100hz, 300hz and so on. Would...
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      Member link test

      How to link a member in a post? hashtag?
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      DIY Subwoofer - 2018 XC60

      2018 XC60 Subwoofer Project.
      First of all, I give massive credit to mark-sf for his initial excellent article on constructing the subwoofer for the earlier XC60, the guidance on amplifier and...
    16. Thanks Mark, I've sorted the problem now by...

      Thanks Mark, I've sorted the problem now by raising the box off the floor slightly....the box was contacting the metal of the floor. Now written my article and will upload to a new post and credit...
    17. Hey mark-sf. I've uploaded all my images to imgur...

      Hey mark-sf. I've uploaded all my images to imgur now so will be doing a write up soon.
      Initial trials suggest I have a mounting vibration issue where the box sits on the metal floor so I need to...
    18. Hi guys. I have now got my subwoofer up and...

      Hi guys. I have now got my subwoofer up and running in my 2018 XC60 based on the design by mark-sf with my own modifications to fit the newer car. I've used the same amplifier and connected via the...
    19. Mark- I have a friend with a 3D printer and so I...

      Mark- I have a friend with a 3D printer and so I designed in CAD the vent with the flares to a tube ID of 53mm and 235mm long, which has enabled me to reduce the velocity to below 30. The printed...
    20. With the vent i had on the way at 46mm ID, the...

      With the vent i had on the way at 46mm ID, the velocity was up at 36m/s. Looks like I need to get up to 52mm vent diameter at 225mm long to limit the maximum air velocity to 30m/s and that's at 40Hz....
    21. Thanks Mark - I'll check WinISD again, but I...

      Thanks Mark - I'll check WinISD again, but I didn't see any warning about the velocity in the vent pipe. I'll dig a bit deeper and see if it shows up in any of the other graphs. Is the vent you...
    22. Mark- the new box is almost finished and the sub...

      Mark- the new box is almost finished and the sub woofers have arrived! I bought a vent pipe which turned out to be a slightly smaller diameter than 2", which then shortens the length required in the...
    23. I downloaded WinISD and gave it a go. I managed...

      I downloaded WinISD and gave it a go. I managed to replicate your box parameters and curve and then changed to suit mine..after a bit of playing with the numbers I have managed to get a nice flat...
    24. Ok Mark, thanks anyway. I had found the vent...

      Ok Mark, thanks anyway. I had found the vent tube at madisound as well as on eBay, but shipping to the UK is $20+ and so I am sourcing a similar looking pair of flares to make a similar unit from...
    25. Mark it looks like you need to be an expert in...

      Mark it looks like you need to be an expert in speaker enclosure design here, and you clearly are...! I plan to follow your recipe to the letter, same speakers, same amp, and if there is no value in...
    26. Hi Mark. Could you tell me the formula you used...

      Hi Mark. Could you tell me the formula you used to derive the duct length, as I can get an increase of volume of 20% and still thin the box to 5.5" so that it sits below the cargo tray? Cheers!
    27. Mark with the 2018 model, the battery is in the...

      Mark with the 2018 model, the battery is in the trunk, so cable runs are not a problem!
    28. Hey Mark. Thanks for that. You just pointed out...

      Hey Mark. Thanks for that. You just pointed out something that I totally missed and that was as per your sketch when I looked close enough that the top and bottom were made from 1/2" MDF rather than...
    29. My bug bears: 1. Dipping rear door mirrors- I...

      My bug bears:
      1. Dipping rear door mirrors- I don't always want them to drop to kerb level as i need to reverse past fence posts or shrubs, so how about saving the last mirror positions in reverse?...
    30. Thanks Mark. I am curious about the internal...

      Thanks Mark. I am curious about the internal volumes because if necessary I could rebuild my box up to 26" long and as much as 13" wide to replace lost volume if I need to make it thinner, based on...
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