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Five 6.5" woofers, On baffle measurements and some brief build quality impressions.

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  • Five 6.5" woofers, On baffle measurements and some brief build quality impressions.

    Standard disclaimer here: not SPL accurate, are not anechoic or quasi-anechoic, I do not have FRD files, they are all taken under identical conditions for comparative purposes only. The baffle is 9.25"W x 15"H. measured at 19" from the mic. All drivers were surface mounted.

    First up is the GRS poly cone unit sold by PE:


    Second is the MCM poly cone (part number 55-2970):


    Third is the Focal/JM Lab paper cone buyout from PE:


    Fourth is the generic 6.5" buyout subwoofer from PE:


    Fifth is the silver cone Bravox (12 ohm) buyout from PE:


    Last is the NLA Realistic 40-1011A polypropylene woofer from Radio Shack:


    The GRS, MCM, Focal, and subwoofer are all neck-and-neck WRT outward build quality. All four have thin, stamped steel frames and rubber surrounds - although the Focal has a smaller diameter surround than the others. The Focal lacks any voice coil venting, but has a bumped back plate. The GRS has a vented back plate, but lacks the bumping. The MCM has a vented and bumped back plate, as does the subwoofer. The Bravox is built way better than the other four drivers, with under dustcap and under spider venting, a bumped back plate (but no back plate vent), and a nice, open molded chassis.

    The cones on the GRS and MCM are similar in construction and appearance, but not the same as I thought they might be when I ordered them. Obviously the MCM has a semi-inverted dustcap, and the GRS has a traditional dustcap. They both sport a medium soft foam gasket, as opposed to the cardboard the subwoofer uses. The Focal has no gasket. The Bravox has a cosmetic molded frame that is also truncated. The silver cone of the Bravox looks striking against my black test box, as well.

    The Focal cone has a slight cast to it, might be just a touch of green in it. Hard for me to say, I have trouble with certain color ranges sometimes. Very old school looking driver with the smooth, untreated paper cone. It is better looking than the subwoofer, but the GRS and MCM are better looking than both of the paper cone units. The Bravox is better looking than all of them. Obviously, this is entirely subjective and YMMV.

    Obviously the test box has an effect on the measured responses, but you can see that manifested in all five measurements. The primary one is a wide hump between 1 and 2k. You can subtract about 3db out of that region to get an idea.

    Again, this is intended only for comparative purposes.

    I did do some distortion testing on all five, but I am not going to publish those results. One of the drivers fared pretty poorly compared to the others, and one of them did much better compared to the others. To be honest, I am going to avoid the controversy so feel free to speculate

    *Added 12/26/2011* The Realistic has a very attractive cone. It loses a build quality point or two because of the foam surround (longevity, not sound quality) and the lack of any voice coil venting. It also lacks a bumped back plate. The stamped frame is in the same class as the other drivers. The impulse response was the second best of the group so far, for whatever that is worth.
    Last edited by johnnyrichards; 12-26-2011, 04:19 AM. Reason: Added Realistic 40-1011
    Don't listen to me - I have not sold any $150,000 speakers.

  • #2
    Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

    thanks for the effort john. that bump at 180 is present in all. is that your room?
    " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

    Quote Originally Posted by hongrn. Oct 2014
    Do you realize that being an American is like winning the biggest jackpot ever??

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    • #3
      Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

      Originally posted by [email protected] View Post
      thanks for the effort john. that bump at 180 is present in all. is that your room?
      Basically, everything below 500 is my room. Gotta gate it somewhere
      Don't listen to me - I have not sold any $150,000 speakers.

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      • #4
        Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

        Thanks Johnny - I've bought more than a few "dogs" as buyouts - and this generous sharing will help us all. I see now why you like that Bravox.

        I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
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        • #5
          Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

          I'd love to see the distortion profile for the Focals. I have a feeling it'd be a bit ugly.
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          • #6
            Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

            You skipped the Aura 6" neo buyouts!
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            • #7
              Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

              Is that Bravox sold out?
              nothing can stop me now

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              • #8
                Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

                The silver cones are sold out the blue coned version from what I've read should be pretty close to the silver version performance wise if you can get over the blue portion of the equation.

                I've got a couple of the silver ones stashed away that are waiting for an eventual 2 way build. Johnny how high do you think the silvers could be crossed?

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                • #9
                  Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

                  Originally posted by bwaslo View Post
                  You skipped the Aura 6" neo buyouts!
                  I did, wouldn't fit in my test box, too small. Maybe something else can be done to add it to the mix.
                  Don't listen to me - I have not sold any $150,000 speakers.

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                  • #10
                    Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

                    Originally posted by Brewski View Post
                    The silver cones are sold out the blue coned version from what I've read should be pretty close to the silver version performance wise if you can get over the blue portion of the equation.

                    I've got a couple of the silver ones stashed away that are waiting for an eventual 2 way build. Johnny how high do you think the silvers could be crossed?

                    Take it easy
                    Jay
                    Oh, 3 or 4 k depending on how much importance you place on CTC rules of thumb.
                    Don't listen to me - I have not sold any $150,000 speakers.

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                    • #11
                      Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

                      the bravox sound very nice. i used them in a mtm with the vifa ox20
                      " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

                      Quote Originally Posted by hongrn. Oct 2014
                      Do you realize that being an American is like winning the biggest jackpot ever??

                      http://www.midwestaudioclub.com/spot...owell-simpson/
                      http://s413.photobucket.com/albums/pp216/arlis/

                      Comment


                      • #12
                        Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

                        Nice work Johnny, very Mythbuster They actually look fairly consistent.

                        I suspect the measurements aren't going to be the whole story at this price point. I really liked those Bravox 12 Ohm in the BRaptor towers.

                        Frankly, for the price of a cocktail, I'm not sure how much time it would be worth to torment them for more data. ;)
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                        • #13
                          Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

                          I have a bevy of silver Bravox drivers, and with their relatively low distortion, smooth response (and it had the cleanest impulse response of the five), and good looks they are destined for my five channel build someday.
                          Don't listen to me - I have not sold any $150,000 speakers.

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                          • #14
                            Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

                            Cool comparison John! I like seeing things like that, it really helps DIYers check out how multiple speakers compair to each other in a common grounds situation. We need more "go to" graphs like that back to back, with out all jargon so to say...just FR/dist. measurements on a common playing field. Thumbs up!!
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                            • #15
                              Re: Five 6.5" woofers, On baffle measurements and some brief build quality impression

                              The Bravox looks awesome, some Satin Black Krylon Fusion shouldn't hurt the MMS to much, haha...

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