Bobby

I don’t think wanna go under 10, although,with the sealed UMs, I here things in some ULF movies that I never heard before,pretty cool.Find the LaVoce in a store in France,tlhp.I’m in Germany too,can you model the eight Saf for me please, I’m not so good with winISD.Can contact me if you want. Thanks all alot for your help!

Hi guys! modified the cabs from ported to sealed ( approx. 6,2 cuft net internal volume) and don’t loose much on ULF, not so loud like the ported around 20Hz, but now extended until 10 and under.Will attach a measurement pic ( black is raw and green is with EQ).I realized that I will never achieve the midbass that I’m looking for with the UMs, no matter what I do and how the in room measurements look like, they are sluggish in my opinion and so I made the decision,on peniku8 and Kyle’s suggestion,to sell the UMs and buy some high efficiency drivers. Don’t know if I can afford to buy B&C,but I find the Lavoce saf184.03 for 200€ and can buy 8 of them( can accommodate another two sealed cabs behind the screen)Presume the 8 can give me the kickbass that I’m looking for and makes a drum solo sound more real life like and think that output is not a problem, but do they reach 20Hz and a little bit under in the ULF? or are there alternatives to the Lavoce until 300 per driver?

Will post some measurements on Sunday cause I’m out of town until than.Thanks a lot for your time and help, I really appreciate it;I really had invested a lot of time and money in my theater, learned a lot and have so much more to learn and I don’t want to give up before the bass ,that is so important to be done right , is not so how I imagine to be to my ears. Very through and very interesting topic what you said about FR in room vs what you hear, but I think it depends from one room to another; A very nice guy, AVS member, that helped me to understand REW , crate filters in rew for my inukes that I applied and the frequency response was perfectly flat from port tuning to 120Hz, but”paradoxically “ how you say, it sound very, very bad in room, the abundance of ULF was so present, I couldn’t turn the volume more than-10db on Wotw, pod scene for example, I think the house was falling apart.Since I sealed provisional the subs and applied just a little EQ-3 points, it sounds better but thhis loud bass from the ported, that was sometimes fun too, disappeared. Although I put a two feet thick absorber on the whole back wall, I have this problems in the ULF, that hope to solve.

I use a miniDsp and after EQ,the response is pretty flat from 10 to 120Hz;Kyle mentioned a few posts above that I need to turn off the HPF after sealing the ports, I’m a little confused now, do sealed subs need an HPF? I will try to set a 5 to 10db peak filter in the minidsp in the 60Hz region(??) to see if the um-18s can give me what I’m looking for.How do you think would the Lavoces perform compared to the UMs if I decided to make the switch ( or any other pro driver with equal specs) in sealed cabs? Do I loose completely the ULF and win better midbass?

I sealed the ports,like you suggested, and the overall result is better than before; the abundance of room shaking Low frequency and TR in the couch is diminished,but still there.Next step is to modify the cabs to have the same internal volume on al six,sealed and see the result; maybe the ULF region and lot of TR is not much of my taste, do you think that six or eight high efficiency 18”, like the Lavoce saf 184.03 in sealed cabs can give me the best of both worlds, enough deep bass and much better punch in the midbass? Think that the small concrete walls room has a lot of gain that made the ported um18 to overkill.I read that the Lavoce is almost as good as the b&c at a lower price.

Have some miniDsp for EQ; my goal is to achieve about 130db at 20 and 120db at 10hz in room.Do you think it’s possible with 6 sealed Ultimax and 4 sealed Magnums? What do you think is the ideal enclosure volume for the ultimax?(I’m not familiar with winISD yet) Want to put the Magnums right beside the Ultimax when sealed.Here is a pic with the actual setup.

Thank you!

Have three inukes6000 dsp, one channel for each driver.I will take some more measurements with rew to see what happened.It can still be a room issue to, but since I installed the huge absorber on the back wall the standing waves are diminished pretty much.I always felt that the ported boxes sound boomy sometimes in my room; is a sealed cab gone to sound different in room then the ported box? for budget reasons,can’t sell the um-18 and go with another driver, just modify the ported and make smaller sealed boxes to have space to accommodate the Magnums-12 to take care for the midbass.Do you think that approximately 7 cft exterior volume is ok fot the Ultimax in sealed enclosure?

I can’t switch the drivers no more, I will stay with the um’s and the Magnums, that are pretty sensitive drivers and give it a shot; I hope to integrate them with the Um’s and split the frequency range in two, say 5-50Hz to the Um’s and 50-120Hz to the Magnums.

Hi guys, Need advice on the bass system for my HT. Have six ultimax um-18 in ported cabs on the front in a array and think about modifying them and put them in sealed boxes,for faster and thighter bass, better group delay and for easier integration,I think. Is a total external volume of about 7 cft sealed box( that is the easiest practical volume after modification)to big for the um18? I saw that on databass it was tested in a 6,16 cft external, and Dayton recommendations is an internal of 4,2 net volume. I have a few Magnum-12 drivers (diysoundgroup)from another project and want to integrate them in a system as midbass modules with the ultimax to split the frequency, the um-18 to about 50Hz and the magnums from 50 to 120Hz, from a single LFE output and split with a miniDsp. The room is about 23’,16’,7,5’ all concrete walls,floor and ceiling; on the back wall is an porous absorber 2’ thick,floor to ceiling,wall to wall. I ask you if going from ported to sealed is a good ideea? forgot to say that from the six ported boxes,two of them that I put in the center of the grid are smaller And after measurements with rew they look a little bit different that the bigger left and right arrays .If I don’t go sealed,I don’t have the space for the Magnums and the two way bass system.Do you think this will work?