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almikel

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About almikel

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  1. My approach with treatment is to target bass frequencies first - usually absorption, usually big, in the corners, but straddlled. Filling in the gap with fluffy is fine. Bass collects in corners, and a room has 20 corners - but straddle corners if using absorption (filling with fluffy is fine). (edit) by big I mean 1200mm wide, at least 200mm deep floor to ceiling. If you have rigid walls (block or brick), then you'll need more specialist approaches to managing the bass response in your room (membrane/pressure traps). Lightly constructed rooms are significantly easier to achieve good bass. Keep adding absorption until the bass is under control (targeting corners). Once you have the bass under control, you may have made the room "too dead" ie too much treble absorption. There are a few options: cover the absorption with a membrane to reflect treble cover the absorption with slats - preferably in a 1D BAD diffusion pattern If targeting corners you're unlikely to absorb direct or 1st reflections from a treble perspective anyway. Once you get the bass right (assuming you haven't killed the treble), further treatment (eg diffusion etc) is icing on top. A few words of caution... other spaces (cinemas, live music venues, cars) will sound boomy compared to your room - you wish you could turn the bass down. In your room, you'll get addicted to tight dry bass and keep turning the bass up Mike
  2. almikel

    System sounding crap

    If your walls are rigid (ie brick or block), you'll struggle to get good "in room" bass you need to run multiple measurements: Right main speaker alone Left main speaker alone Sub alone then Right + sub Left + sub Mike
  3. it's all been said above... No way bass gets worse with treatment, but in reality you have no treatment from a bass perspective - triple check there's no wiring issues. Even in a lightly constructed room with lots of absorption, bass will change markedly as you move around the room, but if your speakers and listening position are in the same spots look for another problem (drivers out of phase, driver not working, amp channel not working etc etc). I replaced the drivers in a woofer box one time and couldn't believe how shite it sounded until I realised one channel was inverted creating massive suckout (the perils of active setups etc) mike
  4. the pictures seem to show the slot at the rear? not the front? You don't want to block the port or the speaker. A down firing sub, which yours is, will have higher feet, as yours does. If hiding it in the cabinet, I'd consider putting it backwards (assuming the port is at the back not the front), or keeping some space behind it for the port to "breathe". It will help to de-couple sub cabinet vibrations - but as you've found, your sash window and walls are likely rattling due to the acoustic energy in the room, not the sub box itself. Those rattles will occur regardless of where you put the sub. cheers Mike
  5. I've often thought about designing/building furniture incorporating treatment - couches, coffee tables, cupboards, wall units. Loads of options if keen on custom work, eg Limp Mass traps built into couches, perforated panels on drawers filled with fluffy, wall unit cavities with Limp Mass at the front etc PtG's idea on bulkheads or risers is great also, and large enough to work low.
  6. not as much as hiding your mains in there If it fits and doesn't cause rattles AND gets SWMBO (wifey) off your back that's a tick in every box...and may allow another sub down the track as she can't see the Jamo. Google says the Jamo sub has a slotted port, but photos don't show the port - if the driver and port are on the front then it should be OK - not necessarily ideal, but everything's a compromise... ...it would be way worse to hide small bookshelf speakers in little alcoves. With subs the wavelengths are so long the sound just goes around and through everything. The key will be rattles from the cabinet - if it doesn't rattle, give this round to SWMBO. Mike
  7. almikel

    DEQX Owners Thread

    I did a bunch of measurements on Sat afternoon, measuring and applying DEQX corrections from the listening position for my TD18s and the single sub - it all sounded very good on Sat afternoon but I ran out of time. On Sunday morning the mike position had changed, as the mike boom was extended to the max and sagged... The standard DEQX correction didn't try to correct big dips so I left DEQX to do it's thing. It's been ages since I pulled out the mike, so some re-learning required, and re-doing measurements required because I forgot to: zero out EQ in the EQ tab zero out any gains on the control panel zero out EQ applied by the remote for all of the above, make sure it's done for the profile used for measuring Sunday morning brought a whole new learning curve (again) for REW - getting REW running again took a bit. DEQX and REW showed other issues I need to review - a big hole around 600Hz - well away from any Xover - a work in progress. I can't make a call yet on whether listening position measurements/corrections for lower frequencies work better than close miked measurements/corrections... cheers Mike
  8. I always point mine forward...it's better only when I'm also measuring higher freq and want to keep the same mike position - otherwise don't worry about it - we're below the transition zone in the room and modal behaviour is dominant. Keep your sub setup as is (your same subs with Y splitter and the new sub with a different channel) for the moment. If you want to run MSO, then run it - or have Snoop run it for you - you'll have to provide Snoop your REW measurements yes, that's what Dave said many posts ago - up to 4 is great and diminishing returns beyond - 3 is better than 2! MSO will consider the 2 subs on the end of the Y splitter as 1 sub, but you still have 2 bass sources instead of 1 on the end of the splitter cable - this makes a difference "in room"
  9. almikel

    DEQX Owners Thread

    Great work - cheers
  10. almikel

    DEQX Owners Thread

    I'm planning to try DEQX measuring and DEQX cal of my TD18 mid bass speakers from the listening position this weekend. Top end are PSE-144's. 2 way horns high passed at 300Hz. I low pass cross to my TD18s at 300Hz, and add a big wad of EQ to push them down from their natural F3 of 95Hz to 50Hz where I cross to a single sub with a 2nd DEQX. I've downloaded the User Manual and searched, but can't find instructions for a feature I've seen Alan use...hoping other DEQX users can assist... I've watched Alan create 2 adjoining correction areas, with different correction limits for each, but can't find how to do it. Is 2 the maximum? If they have to adjoin 3 would be handy... Let's say my listening position measurement has a large suckout at a particular frequency I don't want to correct for. How do you create more than 1 "correction" area? My example might need 3 "correction areas", which may not be possible, ie 1 below the suckout with correction, 1 for the suckout with no correction, and 1 above the suckout with correction)? cheers Mike
  11. Remember I haven't used MSO yet...but this thread made me read more on it... ...and some of my posts above weren't completely accurate after further reading - so apologies. Using MSO as the designer intended ( @andyc56 ) you should measure from multiple positions. Andy actually states that MSO is designed to smooth bass response across multiple listening positions and if you only want to optimise for 1 position another tool may be more appropriate (he didn't suggest what that might be, nor do I have any better ideas than your original plan 😫) Also from my reading I found passages in the instructions that mentioned if the mike positions were too close MSO might EQ down some subs enough to limit maximum volume output. Clearly I need to read instructions more thoroughly, as Dave's post on the DEQX instructions demonstrated. I would suggest looking at MSO as a second stage after tweaking what you have as per above. I still think MSO is valuable in your case, if only to get smoother bass across 2 seats if a mate pops in. This weekend I'm going to try DEQX measuring and DEQX calibrating my TD18s from the listening position (Bi-amp with stereo sub config). MSO for me will have to wait until I've got another sub (or 2) built cheers Mike
  12. because the DEQX cal came with the Legend Big Red speakers?
  13. almikel

    DEQX Owners Thread

    @davewantsmore raised a point in a different thread about using DEQX Speaker Measurements and DEQX Speaker Calibration for measuring/calibrating woofers "in room" - even quoting the section in the DEQX manual 13.6 WOOFER CALIBRATION WITH AN IN-ROOM MEASUREMENT The woofer of a three-way speaker can be calibrated with a speaker measurement taken with the microphone at the listening position. This technique can be used if the three-way speaker is being implemented with the “bi-amp with optional stereo subwoofers” speaker configuration mode I have a vague recollection of reading this long ago (20:20 hindsight), but never tried it. I'd be interested in Dave's and other's views on what the upper frequency limit on this approach would be? In my case I have my PSE-144s, with measurements taken on a very good rig by Mr Deqx (Alan) himself on his QLD trip ages ago. The PSE's cross to my Acoustic Elegance TD18 stereo mid bass. Crossover between the PSEs and the TD18 is 300Hz and I run the TD18s down to 50Hz or so. I've only ever done close miked in room measurements of the TD18s. Is 300Hz way too high to use this listening position measurement approach? cheers Mike
  14. almikel

    Multi-Sub Optimizer

    @davewantsmoore - Great work - pulling out the DEQX instructions (section 13.6 etc) I must admit I haven't referred to them in years - possibly a refresh required! DEQX Speaker correction with the mike at the LP changes things - I have some questions but they're not relevant to this thread. cheers Mike
  15. I must admit how to achieve proper time alignment between a bass driver and a sub with a crossover between confuses me now I "thought" that impulse was still better than step? In the MSO thread Andy made a post regarding the electrical response of linear phase crossover outputs would have their peaks aligned for Impulse Response but not Step Response... My takeout from his post is you would never use peaks in the Step Response to time align ...but in the real world with non linear Xovers and real drivers maybe you still use the Step response, and align to the point where the cones starts moving?? I'm on the wrong PC, but my recollection is that with DEQX curves, Step looks pretty similar to Impulse, so either presents the same difficulties from a reading accuracy perspective? @davewantsmoore I realise they represent the same thing just viewed differently, but could you explain which one to use, and which point on the curve to use for the best outcome for time alignment between a woofer and a sub? cheers Mike
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