X,
I'll go with the single Nautaloss. I assume the dimensions you used for the Vifa driver should be fine?
Cheers!
I'll go with the single Nautaloss. I assume the dimensions you used for the Vifa driver should be fine?
Cheers!
Yes, it will work fine - just note that there is about 6 dB of baffle step loss that you will have to deal with to flatten the frequency response from about 500 Hz on up. This can be done with active EQ or with a BSC. If you want the BSC route: 0.6 mH coil parallel with a 6 ohm resistor, place this in series with positive lead to driver terminal. A XO between 200 and 250 Hz should work well.
Below are the FR for with and without BSC for the FR85 in a Nautaloss I:
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Forgot to send thanks to you xrk971.Grandcalmar,
I stand behind what I said earlier - you are a FC master craftsman! Beautiful work! Those spirals are so precisely laid out and clean. Glad it sounds great - good idea about laying out bracing before hand. That was indeed a time consuming step. I like how you integrated the plate amp! Very cool, very nice. Congratulations!
It takes a genious to see the possibilities. Now I only have to find someone who sells the boards in Sweden🙂
Regards
Wish I could help you Turbon, here in the States we simply walk into a Dollar store (they are all over the place) and grab as many as we want at $1/sheet. 😀 They are labeled "Made in USA" so I guess maybe not something Europe has caught on to making in large numbers yet. Try an art supply store or picture framing store - they will cost more there as they tend to be the thicker paper face variety.
Good luck!
X
Good luck!
X
Hi X.
A quick one. How thick are the boards you recommend? Maybe different depending on where they are used?
Regards
A quick one. How thick are the boards you recommend? Maybe different depending on where they are used?
Regards
Nautaloss with Fountek FE85
X,
I finished one Nautaloss enclosure with a Fountek FE85. I only built one for a couple of reasons.
Firstly, I was concerned that the efficiency might be a little low and that I may need to go to 2 drivers. That is in fact the case and I will go with 2 drivers - I've left room for putting in the second.
Secondly, I wanted to try out a slightly different construction technique whereby I used one 10" by 30" sheet (so one 20x30 sheet for both enclosures) and only made partial cuts through the first layer of paper so that I was able to fold the FC to form the top, bottom and sides with only one glue joint. It worked out quite well and in combination with a slightly better black FC that I got from Staples the folded edges have a nice rounded appearance.
I haven't installed the BSC yet and first listening impressions indicate it's needed. I'll write an update once I have the second enclosure done and BSC installed.
Cheers!
X,
I finished one Nautaloss enclosure with a Fountek FE85. I only built one for a couple of reasons.
Firstly, I was concerned that the efficiency might be a little low and that I may need to go to 2 drivers. That is in fact the case and I will go with 2 drivers - I've left room for putting in the second.
Secondly, I wanted to try out a slightly different construction technique whereby I used one 10" by 30" sheet (so one 20x30 sheet for both enclosures) and only made partial cuts through the first layer of paper so that I was able to fold the FC to form the top, bottom and sides with only one glue joint. It worked out quite well and in combination with a slightly better black FC that I got from Staples the folded edges have a nice rounded appearance.
I haven't installed the BSC yet and first listening impressions indicate it's needed. I'll write an update once I have the second enclosure done and BSC installed.
Cheers!
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Grandcalmar,
Wow! That is a cool design, I see you are adding your own innovations such as the one piece folded sides! Great idea! Can you show a picture of just the side with folds? I think I see it but not totally clear where the scored line is. Will you use this with the Nautaloss sub woofer and do you have a XO or DSP?
Excellent work!
Wow! That is a cool design, I see you are adding your own innovations such as the one piece folded sides! Great idea! Can you show a picture of just the side with folds? I think I see it but not totally clear where the scored line is. Will you use this with the Nautaloss sub woofer and do you have a XO or DSP?
Excellent work!
The foam core I use only comes in a single thickness of 3/16 of an inch (0.1875 inch thick). I double it up or sometimes use triple layers where the driver mounts.
Nautaloss II with dual FE85's
Grandcalmar,
I ran some simulations of your proposed Nautaloss II's with the Fountek FE85. You are right that this driver's sensitivity will be dramatically improved with dual drivers wired in paralllel. If running 2 drivers as a 4 ohm load, reduce the BSC resistor to 3 ohms + same 0.6mH inductor in simulation of single driver. You will have sensitivity of about 87 dB at 1 watt at 2.83V. Note that the tradeoff for having dual drivers is the reduced vertical sweetspot which then becomes +/- 15 degrees as there will be lobing in the vertical direction as you will see in the vertical polar plot. My other comment about this driver is that the 1.5mm xmax is relatively small and you will need to high pass the speaker. For use with the Nautaloss subwoofer, I suggest a -12dB/oct high pass filter at 200 Hz. This will allow you to put a max of 10 volts rms to achieve almost 100 dB SPL at 1m.
Below are the plots for:
- SPL vs Freq at 2.83V without high pass filter
- SPL vs Freq at 10V with 200 Hz high pass filter
- Cone displacement at 10V with 200 Hz high pass filter
- Impedance with high pass filter
- Impulse response with high pass filter
- Polar response for 200 Hz, 1 kHz, 4kHz at 2 meters away
Looks like it can work really well as a monitor for a stationary (seated listening) application.
Grandcalmar,
I ran some simulations of your proposed Nautaloss II's with the Fountek FE85. You are right that this driver's sensitivity will be dramatically improved with dual drivers wired in paralllel. If running 2 drivers as a 4 ohm load, reduce the BSC resistor to 3 ohms + same 0.6mH inductor in simulation of single driver. You will have sensitivity of about 87 dB at 1 watt at 2.83V. Note that the tradeoff for having dual drivers is the reduced vertical sweetspot which then becomes +/- 15 degrees as there will be lobing in the vertical direction as you will see in the vertical polar plot. My other comment about this driver is that the 1.5mm xmax is relatively small and you will need to high pass the speaker. For use with the Nautaloss subwoofer, I suggest a -12dB/oct high pass filter at 200 Hz. This will allow you to put a max of 10 volts rms to achieve almost 100 dB SPL at 1m.
Below are the plots for:
- SPL vs Freq at 2.83V without high pass filter
- SPL vs Freq at 10V with 200 Hz high pass filter
- Cone displacement at 10V with 200 Hz high pass filter
- Impedance with high pass filter
- Impulse response with high pass filter
- Polar response for 200 Hz, 1 kHz, 4kHz at 2 meters away
Looks like it can work really well as a monitor for a stationary (seated listening) application.
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Uhm, and what about 2 x True Digital Power Amplifiers ?
@xrk: do you see any similarities with Tang Band D4-1 DIY Back Horn Speaker ?
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@Byrtt: Have you had a chance to test the qnty 2 x USB DACs as a XO? My concern is the latency and synchronization between the two DAC's.
@fortart.eu: The Hifimediy digital input class D amps look very interesting and certainly can save the additional ADC and DAC stages. Truth be told, a separate $10 to $30 DAC and $15 to $30 TPA3116D2 amp can also do this for less (no case) with 50 watts/ch.
@fortart.eu: The Hifimediy digital input class D amps look very interesting and certainly can save the additional ADC and DAC stages. Truth be told, a separate $10 to $30 DAC and $15 to $30 TPA3116D2 amp can also do this for less (no case) with 50 watts/ch.
More sound clips of Nautaloss I
I was going through an old box of CD's that I have not listened to in ages and put on something I must not have heard in nearly 20 years. The last time I listened to it, I probably heard it on a boom box with CD player. Anyhow, I put the Specials "The Singles" on and WOW - those are some great recordings from the days of analog. It is like I heard the songs for the first time. Anyhow, had to share with you what some of the clips sound like. Really enjoying the Nautaloss I and subs. 😀
I was going through an old box of CD's that I have not listened to in ages and put on something I must not have heard in nearly 20 years. The last time I listened to it, I probably heard it on a boom box with CD player. Anyhow, I put the Specials "The Singles" on and WOW - those are some great recordings from the days of analog. It is like I heard the songs for the first time. Anyhow, had to share with you what some of the clips sound like. Really enjoying the Nautaloss I and subs. 😀
Thanks X🙂
Thats almost 5mm. Would it be bad to use 10mm board all over more than the hassle that it is harder to bend and glue? Would it gain anything?
Regards
If you can bend the 10 mm into a spiral that can work fine as it gives you a stronger box and less bracing needed.
I have been missing out on this thread recently. That's some pretty fine stuff showing up here.
Good on ya lads!
The addiction continues. I just picked these up from across the Salish Sea this weekend. I know it's not foam core but thought you guys might like to see them anyhoo.
Airborne wood cone driver: https://www.solen.ca/pub/index.php?...eau1=1&niveau2=1&niveau3=9&s1=2&s2=1&s3=2&s4=
Onken style cabinets. Designed by Planet10 and built by chrisb. Very nice.
Good on ya lads!
The addiction continues. I just picked these up from across the Salish Sea this weekend. I know it's not foam core but thought you guys might like to see them anyhoo.
Airborne wood cone driver: https://www.solen.ca/pub/index.php?...eau1=1&niveau2=1&niveau3=9&s1=2&s2=1&s3=2&s4=
Onken style cabinets. Designed by Planet10 and built by chrisb. Very nice.
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Well I certainly do (like to see them 🙂 ) -very nice. Some great FC work going on here too (of course -get that in quick. 😉 ).
That is a great looking speaker Cal. How does the wood diaphragm driver sound? I guess paper really is reconstituted wood but in its raw form is very cool. I have yet to hear an Onken alignment - wonder how it sounds compared to BR?
Chrisb makes a nice box.