Announcement

Collapse
No announcement yet.

Nd91-8 and Nd16fa-6

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Scarface1
    started a topic Nd91-8 and Nd16fa-6

    Nd91-8 and Nd16fa-6

    Hi everybody, I want to make a speaker that is small but can as low as 80 hz. I want to use them as satelite speakers in a 2.1 setup. I know there are some designs like scott's helium wich use the nd91-4. Can somebody help me with the crossover. Below 70 hz -- 65 hz Xmax is gonna be to high, so I tought a highpass at 70 hz maybe 65 hz( I don't know If other designs have a highpass to avoid reaching Xmax)





  • Scarface1
    replied
    Jeff, that's the type of amp I use, mine only have a volume for sub, volume for satelite and a overal volume. The amp have a -1.5db around 20 hz what starts slowly at 30 hz, so my sub don't exceed xmax. The crossover that is built in in the amp can be modified...

    Leave a comment:


  • Jeff F.
    replied
    Originally posted by Scarface1 View Post
    https://www.parts-express.com/lepai-...3118--310-4002

    if I buy this one I have a built in highpass but the rest of the amp I know nothing about. I want to give the sub 50 clean watts RMS and this amp only have 60 watt RMS. Also it will only accept a max of 22 V wich isn't 60 watt RMS
    Did you see this amp already?

    https://www.parts-express.com/tps311...e-con--320-635

    Leave a comment:


  • djg
    replied
    For 65 dollars buy buy buy. I used two in identical 2.1 systems with a TB W8-740 sub. I did not notice noise. I did have to use deoxit on the pots as they became very scratchy, now fixed.

    Leave a comment:


  • Jeff F.
    replied
    Originally posted by djg View Post
    The Lepai is not really hifi. No distortion figures given. I have 2 of the MCA 2.1 amps, that does give distortion figures. The power figures of these two amps are not directly comparable.
    djg, how do you like the MCA amps? I read some reviews complaining about noise issues.

    Leave a comment:


  • djg
    replied
    The Lepai is not really hifi. No distortion figures given. I have 2 of the MCA 2.1 amps, that does give distortion figures. The power figures of these two amps are not directly comparable.

    Leave a comment:


  • Scarface1
    replied
    Originally posted by Chris Roemer View Post
    Don't know what your box model looks like, but in 0.05 cf w/a 1"id x 13" long port, they'll take 28wRMS (over 95dB) down below 50Hz before breaching Xmax, AND (IPST) their Xmech is appreciably greater.
    Hi chris, I want to use it for movies so they will take a lot of bass I think. Is there any change that I can put a highpass on the nd91-8 AND a tweeter. The subwoofer sound good and the amp sound good (millstonemike helped me to modify the amplifier).

    Leave a comment:


  • Scarface1
    replied
    Originally posted by ernperkins View Post

    I own and tested the amp you linked. I also own and tested the Dayton MCA2250E plate amp. IMO the MCA2250E is better in all aspects and would recommend that one. The specs says it has a 150 Hz high pass on the satellites, but I measured -3 dB at 85 Hz so I'd call that an 85 Hz high pass.
    Hi Ernperkins, I read your topic about the dayton MCA 2.1 and the satelite channels are fine to me with f3 85 Hz, but my sub is tuned to 30 hz and the MCA can't deliver that. If it can I would DEFENITELY buy it.

    Leave a comment:


  • ernperkins
    replied
    Originally posted by Scarface1 View Post
    https://www.parts-express.com/lepai-...3118--310-4002

    if I buy this one I have a built in highpass but the rest of the amp I know nothing about. I want to give the sub 50 clean watts RMS and this amp only have 60 watt RMS. Also it will only accept a max of 22 V wich isn't 60 watt RMS
    I own and tested the amp you linked. I also own and tested the Dayton MCA2250E plate amp. IMO the MCA2250E is better in all aspects and would recommend that one. The specs says it has a 150 Hz high pass on the satellites, but I measured -3 dB at 85 Hz so I'd call that an 85 Hz high pass.

    Leave a comment:


  • Scarface1
    replied
    Originally posted by Chris Roemer View Post
    So... our boxes are the same size (pretty much) but my lower tuning goes 16Hz lower before Xmax.
    You can also control overexcursion by using the "volume" knob.
    If you don't like my port length, substitute a PR.
    With 25 watt rms I can integrate it with my sub, I think I go for a amp with built in highpass.
    thanks for the responce Chris!

    Leave a comment:


  • Scarface1
    replied
    Originally posted by Jeff F. View Post
    Also, not sure if you are interested in buying an amp...but this amp has a high pass for the satellites and is pretty stinkin' cheap right now

    https://www.parts-express.com/dayton...ifier--300-771
    maybe I gonna buy this amp but for other projects, I live in the netherlands and this amp cost a 160 dollars over here 🤔😅

    Leave a comment:


  • Scarface1
    replied
    Originally posted by Jeff F. View Post
    Check out post #236. Scott has modeled a 8ohm Helium xo

    http://techtalk.parts-express.com/fo...monitor/page16
    Hi Jeff, the amp I use now is 8 ohm for the satelites, so it depends on wich amp I gonna choose. My first option a while ago was the dayton 2.1 amp, but it falls of at 40 hz, While my sub goes down to 30 hz.

    the problem I have is that I need a highpass, but most amp I see with a highpass don't go low enough.

    now I have a tpa3116d2 2.1 amp that start to roll of at 32 hz but don't have a built in highpass.

    the Lepai LP210PA seems good with a highpass at 100 hz but lack a bit on power, but maybe the way to go...

    Leave a comment:


  • Chris Roemer
    replied
    So... our boxes are the same size (pretty much) but my lower tuning goes 16Hz lower before Xmax.
    You can also control overexcursion by using the "volume" knob.
    If you don't like my port length, substitute a PR.

    Leave a comment:


  • Jeff F.
    replied
    Also, not sure if you are interested in buying an amp...but this amp has a high pass for the satellites and is pretty stinkin' cheap right now

    https://www.parts-express.com/dayton...ifier--300-771

    Leave a comment:


  • Jeff F.
    replied
    Check out post #236. Scott has modeled a 8ohm Helium xo

    http://techtalk.parts-express.com/fo...monitor/page16

    Leave a comment:

Working...
X