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Could you please help me figure out my mistake...(Amiga speakers)

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  • Could you please help me figure out my mistake...(Amiga speakers)

    I have been using my new Amiga speakers for the past month and a half with limited pleasure. I was drawn to this speaker design after having been very satisfied with my set of Overnight Sensation, another design of Paul Carmody.

    Somehow I must have done something wrong during their construction because although the highs and the mids are great, there is something wrong with the bass. It goes low, the mix/balance seems a tad too much/hot and it lacks definition being more on the boomy side. It just does not align with the description.

    Two different amps give me this same result: a Cambridge 550A and a Audiolab 8300A.

    Any ideas about what I might have done wrong?

  • #2
    Assuming the cabinet and ports are the right size, it might be a wiring issue; have you checked the drivers' polarity? Also, have you lined the cabinet as per Paul's write up?

    It might also be the crossover wiring, maybe upload photos of your crossovers, if you can get to them, to get some expert comments from PETT members.

    Also, where are the speakers placed - if they're too close to a corner or wall, this might make the bass a bit 'muddy'.

    Last edited by Geoff Millar; 11-10-2019, 07:12 AM.


    • #3
      Can you run an impedance sweep (DATS) of each cab?


      • #4
        Bass can be very messed up by room modes. Have you tried altering their placement or compared known to be correct speakers in the same position?


        • #5
          Thank you all for your responses.

          As far as the cabinets are concerned, I believe I was very meticulous in following the plans. I did not try any modifications.

          The crossover might be the culprit. Sadly I did not take any photos of them. Might be difficult to get to them now, I'll see what I can do.

          Measurements sound promising. If I knew how to do them :-) Any link with information?

          And the room/placement. I have tried many things without success. Obviously the room is far from ideal. I might call a friend to bring in his speakers to compare. Sounds like a easy test.

          Very good advice from you all. Thank you for helping.


          • #6
            Not to sound condescending, but if you plan on more diy audio builds, it might be worth investing in some measurement software. Much of it is free or low cost. Arta and REW are popular measurements software that can be up and running with the addition of a microphone like the minidsp UMIK1 or PE's UMM6 (now on sale $65) for <=$100. An ARTA or REW Limp box can be built for ~$30 allowing that software to do most if not more calculations than DATs performs. DATS is now ~$100 but is straightforward and easy to use, if the new ver3 works as well as ver2.

            Do both speakers sound the same?


            • #7
              Are you from Flint?

              Don't know why the big aversion to adding a "location" to a new user's profile?
              If peeps knew your location, you might be able to get some (free) local help/measurements.


              • #8
                No problem Kornbread, you are right, I have put off for far too long the measurement side of this hobby.And yes, they sound the same.

                Sorry Chris, I will update my profile.


                • #9
                  Mic (MINIDSP UMIK-1), external sound card (Behringer UCA222) and some parts ordered for LIMP box. Stay tuned...


                  • #10
                    IIRC, the uca222 is what I tried and it is too noisy. With a usb mic you may not need an external sound card.


                    • #11
                      Oups, good to know, I'll cancel that Amazon order...

                      But don't I need to use a sound card for impedance measurement? I could still use the one from my main PC instead of my laptop I guess.


                      • #12
                        It may have been the 202 or the 222, can't remember which one. Might want to research it before purchasing. It's laying around here somewhere just not sure under which pile of stuff.

                        Yes, afaik, a sound card is needed for impedance measurements but you may be able to take frequency response measurements without one. I'm not that computer savvy and got rew and the limp box to play together, but the uca2?2 gave a false rising response on the bottom end that was supposedly due to the uca being too noisy.

                        I have a working limp box around here somewhere, if you want it, and I can find it, pay shipping and it's yours. The only thing I ask is for you to post up your progress and when the time comes, lend a helping hand to someone else.



                        • #13
                          Thanks for the offer Kornbread but I'll build my own limp box since I have almost all the parts and the one missing (the resistance) I can pick up locally.

                          I'll definetly post my progress here. I have picked up so much by reading this forum, I am sure even my small contribution might help someone down the road.


                          • #14
                            I've got DATS, and use it on a 5-10 y.o. notebook (under Win/10 - now) as well as a 15? y.o. desktop still running "Vista" !
                            I use (free) ARTA on BOTH machines for FR measurements (EMM-6 mic and "Blue Icicle" - for mic power) using whatever built-in sound those machines have (on the MB). Arta's got "LIMP" for impedance measurements (which I haven't used - due to the DATS) but I'd be surprised if the "on-board" sound (chip) wouldn't work adequately for that as well.


                            • #15
                              Back with some updates...

                              Well, I now have all that is needed for measurements. I have built the limp box. Mic is in, picked up a bigger stand for it last Friday. I just need to bring myself up to speed with the software side, will initially be using REW.

                              But the sound of the speakers is so much better! I have played again with placement, being more meticulous (inch by inch), and well, I have found a good spot. Bass is now more defined, no more boominess. Fast. Maybe they also needed some time to get to their optimal condition? Break-in time? I dunno, but I am very pleased now.

                              Expect more in the next days...