Hello DIY. I am knew to forums and not very good on computors so please forgive me if i am a little slow or make many mistakes.
I think one may have made a mistake on the drivers I purchased (no going back though) YOUTUBE MADE ME DO IT I TAKE NO RESPONSIBILITY!
2X UM18 boxes sealed 113l
2x rosso 21 boxes sealed 160 l
both have matrix brace accounted for in the design
I always thought these subs were OK but not great so I started digging and I found you guys absolutly trashing um18 due to qts of 0.7 instead of advertised at 0.54. Im not a sensitive man but that hurt my feelings a little! although i am totally void of responsibily as its youtubes fault! but guess what! the rosso is 0.7 aswell ARRRHH. is this why they only preform in the 40hz down range?
My question is what do I do? £1500 in on these drives.
buid new boxes large sealed to bring the qts down but lose power handling.
Start again cut my losses on the drivers
buy more subs 6no total 4 for 30hz down 2no for 30hz up
just buy a jbl party box and be done with it 🙂
I will give you all the info on room build if your interested. THATS ALSO YOUTUBES FAULT. Im in the building trade so thats going well 🙂
This audio jorney has turned my life upside at the moment guys! My house is right mess I have wires and boxes every where. Im single so its ok for a while but will this end?? serious question guys?? every solution creates a problem I dont have a wife for this reason.
I think one may have made a mistake on the drivers I purchased (no going back though) YOUTUBE MADE ME DO IT I TAKE NO RESPONSIBILITY!
2X UM18 boxes sealed 113l
2x rosso 21 boxes sealed 160 l
both have matrix brace accounted for in the design
I always thought these subs were OK but not great so I started digging and I found you guys absolutly trashing um18 due to qts of 0.7 instead of advertised at 0.54. Im not a sensitive man but that hurt my feelings a little! although i am totally void of responsibily as its youtubes fault! but guess what! the rosso is 0.7 aswell ARRRHH. is this why they only preform in the 40hz down range?
My question is what do I do? £1500 in on these drives.
buid new boxes large sealed to bring the qts down but lose power handling.
Start again cut my losses on the drivers
buy more subs 6no total 4 for 30hz down 2no for 30hz up
just buy a jbl party box and be done with it 🙂
I will give you all the info on room build if your interested. THATS ALSO YOUTUBES FAULT. Im in the building trade so thats going well 🙂
This audio jorney has turned my life upside at the moment guys! My house is right mess I have wires and boxes every where. Im single so its ok for a while but will this end?? serious question guys?? every solution creates a problem I dont have a wife for this reason.
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Moved to Subwoofers.
You have good drivers and boxes, and from the other thread it sounds like you have decent amplifier power available. MiniDSP can apply Linkwitz Transform EQ to your sealed subs to achieve whatever f3 and Q you want, within the available excursion and amplifier power/driver thermal power ratings.
Even if your boxes are not the ideal size, you should attempt this before you go scrapping anything. You have all the required ingredients already...
Even if your boxes are not the ideal size, you should attempt this before you go scrapping anything. You have all the required ingredients already...
Hello Matt.. Thanks for putting me ease.
This new bit of info was revealed to me last night, I had no idea that eq was eliminated the effects of a smaller box but it makes sense once you hear it. the Linkwitz Transform EQ did add a lot more boost from 40hz down but that does make sense as they f3 on rosso is around there and it does sound better.. do think upgrading to the balanced 4v xlr minidsp?? one of them 8out. my signal does get high on the 2x4hd now i had nearly 10db on the low end.
This new bit of info was revealed to me last night, I had no idea that eq was eliminated the effects of a smaller box but it makes sense once you hear it. the Linkwitz Transform EQ did add a lot more boost from 40hz down but that does make sense as they f3 on rosso is around there and it does sound better.. do think upgrading to the balanced 4v xlr minidsp?? one of them 8out. my signal does get high on the 2x4hd now i had nearly 10db on the low end.
Not sure of the maximum signal from the minidsp2x4hd. However, the XLS1502 has configurable input sensitivity to either 1.4Vrms or 0.775Vrms via the menus. You should have no trouble driving the amp to full output, but do check those settings.
Icandothat are you familiar with room modes? And do you have capability to measure the system?
Bass is seriously affected by room modes, so if your boxes are built fine enough and EQ:d fine enough for nice anechoic balance, then it must be the room and/or how you've integrated the subs to your main speakers.
The room can add easily +-10db peaks and dips to the response, and these really make bass sound nasty and attention grabbing. If you move yourself a little the peaks and dips would change frequency. Advantage of multisubs, that you have, is that the sound can be statistically averaged through out the room, so what you need to do is to measure the system and start adjusting it for better.
I have no tips for multisub tuning, but you can find a lot by search. Same for measuring it all.
Certainly the sub drivers should be just fine and plenty. You might have some issues with the builds, or it's just matter of tuning the system correctly.
Have fun!
Bass is seriously affected by room modes, so if your boxes are built fine enough and EQ:d fine enough for nice anechoic balance, then it must be the room and/or how you've integrated the subs to your main speakers.
The room can add easily +-10db peaks and dips to the response, and these really make bass sound nasty and attention grabbing. If you move yourself a little the peaks and dips would change frequency. Advantage of multisubs, that you have, is that the sound can be statistically averaged through out the room, so what you need to do is to measure the system and start adjusting it for better.
I have no tips for multisub tuning, but you can find a lot by search. Same for measuring it all.
Certainly the sub drivers should be just fine and plenty. You might have some issues with the builds, or it's just matter of tuning the system correctly.
Have fun!
If you haven't already, invest in a USB measurement mic and check out Home Theater Guru's series on bass setup (more Youtube for you!)
https://www.youtube.com/playlist?list=PLQ4bUzhLn0LqZueY3GiRCFyJypkvFIkEz
Keep in mind any EQ filters you add for room correction would be in addition to the filter you've set for the Linkwitz Transform of the subs themselves.
At a glance, with your room layout and 4 subs, you might have better luck (as a starting point) by moving your corner subs to the side wall midpoints. That's based on the old Harman multisub white paper, https://www.harman.com/documents/multsubs_0.pdf .
To take it to the next level, look up Multi Sub Optimizer (MSO) software. You will need a measurement mic and to gather a set of measurements at your listening positions using REW, in a very particular way. People who have done it have had great results.
https://www.youtube.com/playlist?list=PLQ4bUzhLn0LqZueY3GiRCFyJypkvFIkEz
Keep in mind any EQ filters you add for room correction would be in addition to the filter you've set for the Linkwitz Transform of the subs themselves.
At a glance, with your room layout and 4 subs, you might have better luck (as a starting point) by moving your corner subs to the side wall midpoints. That's based on the old Harman multisub white paper, https://www.harman.com/documents/multsubs_0.pdf .
To take it to the next level, look up Multi Sub Optimizer (MSO) software. You will need a measurement mic and to gather a set of measurements at your listening positions using REW, in a very particular way. People who have done it have had great results.
This look remarkably similar to the the JBL white paper I read at brunch today with my old friend Albert Neville
This is the site I got the pics from.
https://www.gikacoustics.com/room-setup-speaker-placement-201-part-two-subwoofers/
https://www.gikacoustics.com/room-setup-speaker-placement-201-part-two-subwoofers/
audioholics has a college called Anthony.G. He says four midwall for clean bass and connor loaded for a boost but i alway lose low end with two sub behind me or mid wall. They are aligned but I lose a lot of clean room gain for some reason