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kipman725 last won the day on December 3 2020

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About kipman725

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  1. this should help with your generator issues as the measurements I have seen of Powersoft amps(x4/x8) show sinusoidal in phase mains current whereas reports on the NU/NX6000 indicate large current spikes.
  2. Series would be 8 ohm and parallel 2 ohm. 2 ohm will cause greater heating of the amplifier but will increase the maximum possible power output. The datasheet specifies that the heatsink temperature should not be allowed to exceed 95C with the note that reduced performance may occur at this temp. I would suggest installing temperature controlled fans, cheap fan controllers with temp sensors that drive PC 12V fans are readily available.
  3. https://www.comsol.com/paper/download/679311/bezzola_paper.pdf might be of interest for a 'fully optimized' design
  4. I think from the datasheet the 18mm is when BL=0.7*MAX(BL). Looks like a great deal for the price, shame that price will not be anything like that in the UK. I wonder how it would do in a FLH like the lab horn?
  5. I'm interested in this popplar plywood carbon-epoxy layer construction, do you have any details of the products used?
  6. Boxes are isobaric bass reflex with all 4 voice coils over two drivers in series making a 16 ohm nominal box. I observe up to 2dB power compression on a 94V sweep but its at the frequencies where excursion is maximized, I don't think I can see any heating effect in the data I have. I don't have data for higher voltage sweeps because that's as much as I could get out of the amp I had at that time. I used to run these drivers in sealed cabs and this resulted in the motor structure glue failing jamming the voice coil, the voice coils suffered mechanical damage (scrapes) but didn't burn. This
  7. I want to define some long term power limiters for my subs using Pyle plpw15D drivers as I'm going to hook them up to a bigger amp. However as they are car audio drivers with non PA coils I'm not sure what a sensible long term power limit would be: the former is alu which should increase power dissipation capabilities, 2.5" dia, 4 layer with two voice coils. They have a vented pole peice. The manufacturer rates the driver at 1000Wrms which from rules of thumb I have seen would suggest around 500W as a sensible long term limit. I also found this chart from powersoft: fr
  8. High power closed box doesn't work well for PA the air inside the box gets hot so after an hour or so you will get noticeable reduction in output, I have tried it and changed to a design closer to ported. Some reduction in box size should be possible by accepting a non flat un-equalised response.
  9. https://www.powersoft.com/wp-content/uploads/2018/04/Powersoft_X8_DS_EN_WEB.pdf So you have the choice of running the two channels bridged or as non bridged channels. Bridged is rated down to 4 ohms so you can't run all 4 drivers off this. Then looking at single channels maximum rated power is at 2ohms per channel so you should put two 4 ohm coil drivers on each channel. This excludes the IPAL leaving the SW or DS, the DS has a more powerful motor and slightly higher XVAR so should be capable of more output.
  10. The configuration I have used is the right hand side one with a box that has 3 speakon connectors (input and two outputs). I just used a plastic project box and held it all together with a lot of hot glue.
  11. I have run subs in series with an external "series speakon adaptor" box I made without any issues. I think as long as you are using identical subs there shouldn't be any issue running them in series as speakers are fundamentally current mode devices. This is also why I run the drivers in series in my isobaric subs as this means that the force exerted by each motor should be equal.
  12. oof. 2 sub version of that stack would be nice at home.
  13. Thanks for the info! I had already designed a sub with just pipe ports to try and get something built quickly, however I needed to redesign it as my model would break on changing the material thickness parameter and it was overweight for the application (ultra portable human carried ~5km) resulting in a change from 18mm to 12mm (yes I know 12tbx100 is heavy, but I got them cheaply and this is the easiest thing to change). But then I realized how much output at tune I was potentially giving up (JBL HLA port design information indicates around 9dB at tune). In the future I would be interested
  14. ah ok I have only used 1/2 of the port here so I guess the height is less than I expected?
  15. I liked this port so much I'm basically copying it for my 12TBX100 sub. The height wasn't listed so I guessed it as 44mm from the pictures (3*18mm boards with 10mm of rebate). Tuning came out at 38Hz. How close did I get? I'm also guessing from how your Hornresp response compares to mine that you used complex inductance parameters?
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