Quatro 15"/250W amp impressions, $250 earthquake anyone?

Discussion in 'Home Theater Projects' started by Jason Dalton, Jun 14, 2004.

  1. Jason Dalton

    Jason Dalton Stunt Coordinator

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    I finally got to listen to do some serious listening on the sub I built with my friend. I went over to his house Sunday with DVDs in hand. The box is 5.8 cuft (23.5" cubed) and tuned to 20Hz using the 4" Precision Port (268-352) and powered by PE's 250W remote controlled plate amp (300-793).

    From the first moment I was impressed with this thing, my friend had rented LOTR:ROTK and he couldn't wait to show me the battle scene with the huge elephant things. Wow, just wow. From there we did the RPG Launch scene from Ronin, this is supposed to have extremely loud bass in the 30-50Hz region, and it did. That was the only scene where the sub had some problems, when we turned it up the amp clipped a bit at the loudest part. No signs of woofer bottoming. Next was the real test, Darla's tank tapping in Finding Nemo. There has been alot of talk about this scene and I couldn't wait to hear it, I never noticed much listening on my setup since I have no sub (damn apartments). Finally the moment came...OMFG!!! Talk about an earthquake! Jeez, it was totally insane, if you haven't heard this scene with a good sub the difference is amazing. The whole house was shaking. The windows were reverberating for 5 seconds after the scene was over. We kept playing it over and over again, one time my friend put it on when I was in the kitchen, which is two rooms over, and the floor was shaking just as much in there. It was nutty.

    This sub is definitely worth the money and more. You can make this sub for $250, which to me just seems beyond belief. Anyone who is looking for a value in the subwoofer market should know about this.

    Jason
     
  2. Brad Boydston

    Brad Boydston Auditioning

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    I find it refreshing to hear people's ACTUAL listening impressions.

    Thanks for the post!
     
  3. Aaron Gilbert

    Aaron Gilbert Second Unit

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    I'm with Brad, it's nice to hear listening impressions, especially when that person has the same subwoofer driver as I do. I have about 400w on tap, and it's more than this woofer needs, especially since my box is considerably larger. I haven't gotten Finding Nemo yet, but it's nice to know I'm not the only one with houses rattling. Frankly my house would need more treatment and reinforcement before going to a more potent subwoofer. The scene that gets my house going the best so far is The Fellowship of the Ring, in Bhalin's tomb when the Orc drums first start beating after the armor get's knocked down into the depths. Of course the best way to see which appliances and walls rattle is to hook up your computer to your system and download a signal generator program. Then you can tell exactly what frequencies are most problematic.

    I agree with the amazing value.
     
  4. Jason Dalton

    Jason Dalton Stunt Coordinator

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    Aaron, I'll have to check out that FOTR scene. What size box and tuning do you have? My friend was going to go with the Rythmik 350 amp, but the WinISD simulations seemed to show that you could just about drive it to its excursion limits with 250W (and the 250W amp was on sale[​IMG]). I have Audacity and I'm going to make a tone disc just for fun to see what it can do.

    Hopefully, at some point I'll have the money and space to make lots of things that require listening impressions.:wink:
     
  5. Cam McFarland

    Cam McFarland Supporting Actor

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    Aaron, how do I go about doing this?


    - Cam
     
  6. Jason Dalton

    Jason Dalton Stunt Coordinator

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    I downloaded Audacity for free, it lets you make custom tone files. Its pretty neat. Plus you can export the Audicaty files to .mp3, .wav or a few others so you can burn them onto a CD. Pretty amazing for a free program.
     
  7. Jason Dalton

    Jason Dalton Stunt Coordinator

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    I downloaded Audacity for free, it lets you make custom tone files. Its pretty neat. Plus you can export the Audicaty files to .mp3, .wav or a few others so you can burn them onto a CD. Pretty amazing for a free program.
     
  8. Jason Dalton

    Jason Dalton Stunt Coordinator

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    Here are some pics of the sub being built and a pseudo-finished pic. We're still working on the piano gloss finish, but we did hook it up. That TV in the picture is a 36"er.[​IMG]

    Quatro Pics
     
  9. Jason Dalton

    Jason Dalton Stunt Coordinator

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    Here are some pics of the sub being built and a pseudo-finished pic. We're still working on the piano gloss finish, but we did hook it up. That TV in the picture is a 36"er.[​IMG]

    Quatro Pics
     
  10. TomBarnard

    TomBarnard Extra

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    I am a newbie to DIY, but a long time HT junkie and pretty fair with a saw and soldering iron. All that being said, i've never built a sub before and what you guys have described in this thread is right up my alley in price and scale.

    I don't want to divert your thread more than one good answer, but could one of you tell me where I could find the plans and parts for the aforementioned subs. I would REALLY appreciate it.

    Thanks a ton!!!
     
  11. TomBarnard

    TomBarnard Extra

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    I am a newbie to DIY, but a long time HT junkie and pretty fair with a saw and soldering iron. All that being said, i've never built a sub before and what you guys have described in this thread is right up my alley in price and scale.

    I don't want to divert your thread more than one good answer, but could one of you tell me where I could find the plans and parts for the aforementioned subs. I would REALLY appreciate it.

    Thanks a ton!!!
     
  12. Wes

    Wes Screenwriter

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    I have two quatros powered by a Rythmic 350w plate amp. It does an excellent job for the money. But for an extra $100 or so there are better speakers that will do much better.

    I wanted two matching 15"ers and was on a budget so the quatros worked great. See my theater web site!

    Wes
     
  13. Wes

    Wes Screenwriter

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    Location:
    Utah USA
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    Wes Peterson
    I have two quatros powered by a Rythmic 350w plate amp. It does an excellent job for the money. But for an extra $100 or so there are better speakers that will do much better.

    I wanted two matching 15"ers and was on a budget so the quatros worked great. See my theater web site!

    Wes
     
  14. Jason Dalton

    Jason Dalton Stunt Coordinator

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    I'll PM ya.[​IMG]
     
  15. Jason Dalton

    Jason Dalton Stunt Coordinator

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    I'll PM ya.[​IMG]
     
  16. Jason Dalton

    Jason Dalton Stunt Coordinator

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    While you can get something better for ~$100 more, when you are talking about $250, $100 is a pretty big jump. $350 certainly isn't a lot in the grand scheme, but I think if you want a very capable sub at the lowest price possible, its hard to beat the Quatro 15.
     
  17. Jason Dalton

    Jason Dalton Stunt Coordinator

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    While you can get something better for ~$100 more, when you are talking about $250, $100 is a pretty big jump. $350 certainly isn't a lot in the grand scheme, but I think if you want a very capable sub at the lowest price possible, its hard to beat the Quatro 15.
     
  18. Aaron Gilbert

    Aaron Gilbert Second Unit

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    Jason,

    Sorry for the delay. My box is approximately 275 liters net (9.7 cubic feet). It's tuned to 11Hz via two 3" x 28" ports, non-flared. I don't get any port noise because of the low tuning, which also keeps group delay in the audible range remarkably low. Of course, if I put my signal generator at 11Hz and crank up the volume, I get a ridiculous amount of cone movement and the ports sound like a steam train at full speed. [​IMG] My amp definitely has more power than I need, but better too much than not enough, right? I got the amp years and years ago for a great deal, and it's a killer amp, so no use letting it go to waste, right? My receiver has a bass-peak level manager, which limits the voltage to the subwoofer output, so I don't have to worry about bottoming the woofer. Although to my eyes, the mechanical limits seem to be quite a bit higher than the 10mm Xmax given.

    Here are a bunch of construction pictures of my sub:

    http://www.aaroncgilbert.com/emeraldtitan.html


    Aaron Gilbert
     
  19. Aaron Gilbert

    Aaron Gilbert Second Unit

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    Jason,

    Sorry for the delay. My box is approximately 275 liters net (9.7 cubic feet). It's tuned to 11Hz via two 3" x 28" ports, non-flared. I don't get any port noise because of the low tuning, which also keeps group delay in the audible range remarkably low. Of course, if I put my signal generator at 11Hz and crank up the volume, I get a ridiculous amount of cone movement and the ports sound like a steam train at full speed. [​IMG] My amp definitely has more power than I need, but better too much than not enough, right? I got the amp years and years ago for a great deal, and it's a killer amp, so no use letting it go to waste, right? My receiver has a bass-peak level manager, which limits the voltage to the subwoofer output, so I don't have to worry about bottoming the woofer. Although to my eyes, the mechanical limits seem to be quite a bit higher than the 10mm Xmax given.

    Here are a bunch of construction pictures of my sub:

    http://www.aaroncgilbert.com/emeraldtitan.html


    Aaron Gilbert
     
  20. Jack Keck

    Jack Keck Second Unit

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    Jason,

    I have a few questions:

    1. How long is the port?

    2. Did you use any internal bracing?

    3. Did you line the box? If so, with what?

    Thanks,

    Jack
     

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