DIY Sound Group HTM-12 Build

Discussion in 'DIY Speaker & Subwoofer Building' started by mkohman, Nov 18, 2017.

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  1. The Dreamer

    The Dreamer
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    Ah! I would never get permission to work indoors - apart from the cinema itself - and I’m not going to start cutting MDF in there!

    ...and of course I forgot to say how good your speakers are looking. I’m pretty sure I’m going to give it some TuffCab love and call it done! :blush:
     
  2. mkohman

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    Thank you [emoji4]
     
  3. mkohman

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    3 coats of matt black paint, 400 grit sanding in between each coat... That's it for today.. Tomorrow I'll do the same but with 600 grit sand paper in between, total of 6 coats.. I know it's totally unnecessary however I'm only doing this once and I have the time and energy to do it so why not lol :)

    I also sealed the inside of each cabinet with white grab adhesive which again is totally unnecessary but I had some spare tubes in the garage and thought it would be a good idea to put them in use.. Here's a few photos...

    Finally, if these speakers sound as good as they look I will be 1 happy man I tell ya [emoji23][emoji106]
    IMG_20171216_135103240.jpg
    IMG_20171216_181842360.jpg IMG_20171216_181829806.jpg IMG_20171216_181818928.jpg
     
  4. Liammonty123

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    The paint job you have done is fantastic, looks really pro! Well done!
     
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  5. mkohman

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    Thank you very much Liam.. I really appreciate it. I have atleast 3 more coats to go [emoji4]
     
  6. mkohman

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    Done a couple more coats today.. In total I think 7 or 8 coats I lost count lol.. Basically there are absolutely zero visible joins... I pre drilled the screw holes which I should have done this before painting really because I now have to do one more final coat on the front as there are little marks here and there from the pre drilling..

    I then installed the crossover boards to the top left corner where the tweeter will be placed. Once I screwed in the bare cables onto the crossover boards I applied a little bit of solder which was totally unnecessary I know but I just wanted to make sure they were not going to get undone in time..

    I have run out of some acoustic tiles so I need to order 2 more panels to complete the job... Here are some pictures. IMG_20171217_125807231.jpg IMG_20171217_125817952.jpg IMG_20171217_165146941.jpg IMG_20171217_191810254.jpg IMG_20171217_191957114.jpg
     
  7. mkohman

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    Today I managed to finish the internal insulation of the speakers and gave them 1 last coat of paint.. What I was wondering is where do I measure from to cut the ports to 3.25"? Do I measure from the top of the port or from the bit after going into the front baffle as 3.25"? Please see pics for reference.. Thanks.. IMG_20171219_203208896.jpg IMG_20171219_203232178.jpg IMG_20171219_195807259.jpg IMG_20171219_195641341.jpg IMG_20171219_195610506.jpg
     
  8. Liammonty123

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    I measure from the very top of the port but now you say it I didn't actually confirm with Erich this was correct, although I can't imagine it would make much of a difference crossing them over at 80+hz anyway. You've done a really good job on the cabs quite jealous of the paint job as that is how I originally wanted mine to look. Ah well, now they're behind the screen it's all about the sound!
     
  9. Liammonty123

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    Also you may need to watch the foam around the port area as you may not be able to get them in as is!
     
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  10. mkohman

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    Cheers I thought about that before I installed the foam they can very easily be pressed in and then I slide the ports in place.. Thanks for noticing though :)
     
  11. Liammonty123

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    Ah right, my poly wadding was the same but was also easily compressed as you say ! So close now!
     
  12. PsyVision

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    I measured from the end, as per Liam and shown in your 1st photo.

    I found the ports very tight to fit, have fun with them :)
     
  13. Liammonty123

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    I found a scrap piece of MDF and a hammer was necessary to get them in. And not just light taps but quite heavy bashes I got quite scared they were going to break or mark at one point[emoji23]
     
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  14. mkohman

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    Hmmmmm.. not looking forward to putting the ports in that case.. might have to slightly sand them and lube them with liquid a little ..
     
  15. mkohman

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    So... After approx 6 hours of grafting away after work this afternoon / evening I have finally finished all 3 speakers.. For the record the ports were the easiest to install.. All I had to do was cut to size, sand the rough edges with 300 grit sandpaper, align perfectly straight into the port hole and push them in.. Was very easy lol :) @PsyVision @Liammonty123

    The hardest I would say was the waveguide installation into the cabinets. Where I had painted the groves insides etc of the cabinets it was ultra tight fit and two of them didn't go in so I had to gently sand the internal edges to force them in gently then screwed them in..

    In the end I did install the polly fill behind the waveguides as can be seen in pics below and they are covering the crossover board. I don't think it will be a problem (I hope) lol.. I put them in the spare bedroom untill tomorrow where I will install then behind the cinema screen in their final place.. I will take some more pictures in the morning and post later in the day... Here are some pics from tonight.. I'm so relieved its all finished and they look absolutely stunning.. Easily would believe they were purchased from a audio store.. I'm very proud of how they look but the big question is.. How do they sound? Lol.. I hope to find out tomorrow some stage.. Possibly after work but I'll try install them in morning before I go work in afternoon... Here are some pics from tonight :)

    IMG_20171219_221958922.jpg IMG_20171219_235557588.jpg IMG_20171220_010303326.jpg IMG_20171220_012705808.jpg IMG_20171220_013014314.jpg IMG_20171220_002133032.jpg IMG_20171220_004027060.jpg IMG_20171220_004001063.jpg IMG_20171220_003942781.jpg IMG_20171220_014803118.jpg
     
  16. Ringnut

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    Very professional finish, let's now hope they sound as good as they look! :)
     
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  17. ash23t

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    Great job :thumbsup:
     
  18. Liammonty123

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    Really well done on the speakers, pro looking job! How big is your room?
     
  19. mkohman

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    Cheers @Liammonty123 my room as around 6.7m long and 4.5m wide
     
  20. mkohman

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    Moment of Truth ;) IMG_20171220_110102511.jpg IMG_20171220_110129929.jpg IMG_20171220_110139067.jpg IMG_20171220_110148831.jpg IMG_20171220_110157704.jpg IMG_20171220_110214093.jpg
     
  21. Liammonty123

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    That's almost double the size of mine then, are you planning on any room treatments for them?
     
  22. mkohman

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    I have treatment for the whole wall behind the speakers and little treatment here and there but no big panels etc as this is not a fully dedicated room.. I depend on Anthem's ARC which does an absolute amazing job..
     
    Last edited: Dec 20, 2017
  23. mkohman

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    Quick update :

    As I started work at 2pm this afternoon I had the morning to setup the speakers in their final place (behind the AT screen) before heading off to work..

    I managed to connect everything up and cam confirm all the tweeters and woofers are working fine along with the crossovers and all connections so that was a big relief as I really didn't want to start taking the drivers out and trouble shoot if there were problems.. Touch wood all good[emoji106].

    As for demoing I didn't really have time to do so as I had to leave for work, however from what I have heard (John Wick Red Circle Club Scene) it sounded very clean and punchy.. However it was a very quick demo literally 5 mins if so and I won't be doing any reviews untill I have fully calibrated the speakers with Anthem's ARC and watched a good few movies.. I appreciate the tweeters and woofers still all need to loosen up a little and bed in gently.. So as a summary sounds all good for now but then again so did my xtz m6 speakers.. I would say they sound similar but more fuller than the m6's but as previous remarks I don't want to and can't comment yet as the current calibration file they are running on are still for my old speakers.. Once I re calibrate and watched a few movie scenes that I'm familiar with I can then return and write a comprehensive review on how I feel. It took me just over a month from start to finish and was a very enjoyable project.. Would I want to do it again? Not anytime soon lol... I now want to sit back and enjoy my movies again.. For now it's a winner already
    [emoji4][emoji106][emoji106] IMG_20171220_115805368.jpg IMG_20171220_121308336.jpg IMG_20171220_121316150.jpg
     
  24. markymiles

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    So did you manage to fire them up or is that later..............

    *edit* obviously typing at the same time :rolleyes:
     
  25. Liammonty123

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    One thing to note when testing is that these really come alive when turned up loud. They can be played as high as your receiver will allow so don't be afraid to push them, because they won't break a sweat, it usually takes some volume for the midbass to give it's full effect!
     
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  26. mkohman

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    I completely agree .. Definitely started to liven up more around -20db upwards.. All this is to come as I will be fully testing them out as they are in their permenant place now :) I just want to get the calibration done in a couple of days when I get a chance and then crack on from there on...

    Thanks again to everybody for all your help :)
     
    Last edited: Dec 20, 2017
  27. Deleted member 598831

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    They look bloody spot on! What a well built speaker/s, enjoy!
     
  28. mkohman

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    Thank you very much.. Much appreciated [emoji6][emoji106]
     
  29. mkohman

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    Mini update:

    This afternoon I finally got to calibrate my whole system again but this time with the HTM-12s up front..

    The girls wanted to watch the TROLLS movie again.. We have seen it before but they like that movie a lot so obviously I agreed and as I have also already seen it at least twice before with the m6's upfront I thought it would be a great opportunity to see if I could see any differences..

    Now I know it's too early to give a full review but I wanted to share my initial thoughts with you guys as I have shared the build on a daily basis...

    I have no reason to prefer one speaker to another and as I have always said, if for whatever reason I was not happy with the HTM-12s I would happily sell them on the forum or elsewhere and re buy the m6s or even the new m8s...

    Well to sum it up.. These are the best sounding speakers I have ever had in my home period... They are full of dynamics, so effortless and so so clean. When I say clean I mean crystal clear clean.. The voices sound crisp and you can even hear the little sounds when speaking is present like lips touching each other when speaking if that makes sense.. The woofers will probably need to loosen up a little more I guess before they reach their full potential but from what I have heard so far they are absolutely Brilliant.. That mid bass depth, punch is very present.. I felt it particularly at the end of the Trolls movie.. There is a mid bass heavy type of track and I went close up to the screen and could feel the mid bass, just awesome..

    I won't lie I have and still have nothing bad to say about my previous speakers xtz m6's and still highly rate them.. If I were to reccomend anyone a commercial product it would definitely be XTZ cinema series.. I will say that again and again.. However in my honest opinion, I am more than satisfied with what I have achieved with the HTM-12s and can honestly say it was the best move I could have made rather than upgrading to a newer model..

    The HTM-12s are simply effortless.. You have to hear to believe.. The sound stage is HUGE... I mean the m6s were big Sound stage but these are just HUGE.. so much headroom, I will never need another LCR in this room and a room even bigger lol..

    I just can't wait to hear them sound better and better as time goes on and they break in nicely..

    This was foreign grounds for me as I have never in my life built a speaker but thanks to all you guys and obviously the creators @mtg90 and @Erich H I am over the moon with these beast of speakers..

    These are my thoughts after just watching 1 full movie and spending a couple of hours of demoing familiar movies clips.. I will update with a comprehensive review with a breakdown of how things sound in a few months when they have been properly broken into and watched more movies.

    Adele Royal Albert Hall concert.. I mean this Bluray always sounded amazing with my previous speakers and with the HTM-12s it sounded even better.. Louder, clearer, more depth.. The crowd sounded amazing, the musicians and Adele was in my room[emoji23][emoji106]

    Breaking of glass in Watchmen the opening scene, it has never sounded like this before.. The horn tweeters are truly a work of art in its self.. I have not tried toe in and won't for now as it sound absolutely awesome as it is but may experiment in a couple months to see what all the fuss is about..

    Finally thanks to all who has chipped in and helped me out along my adventure and will be back with a dual subwoofer build next year [emoji6][emoji106]

    Wish you guys all the very best.. Merry Christmas and a Happy New Year...[emoji322] [emoji319]
     
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    Last edited: Dec 23, 2017
  30. Liammonty123

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    Phew, glad you liked them then, join the club! Time to sit back and enjoy them with your family over the Christmas period, talking of dual subs I will have my build thread up for dual 18s next week hopefully! I can agree though that the speakers and especially the horns are beautiful sounding, however in my room I have a way to go in terms of treatments, so they should only get better! Merry Christmas and a happy New year!
     

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