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Old 21st February 2018, 02:41 PM   #2451
mkane77g is offline mkane77g  United States
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These work great for driving woofers
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Old 21st February 2018, 04:45 PM   #2452
Godzilla is offline Godzilla  United States
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jklow888, those look great! Would you share a picture of the back of the speaker? I’d like to see how you are supporting the baffle. Looks like you have come up with a simple and clean solution. In addition, have you considered powering the Alpha’s with their own amp and the TBs with their own amp? That’s what I would do.
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Old 21st February 2018, 11:03 PM   #2453
jklow888 is offline jklow888  Australia
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Quote:
Originally Posted by perceval View Post
After playing around, you decided to keep using Harsch, eh? Glad you like it.

I just don't know about the low watts amps... those dual Aplhas might get power starved.

Look around. There are plenty of amps that provide the warmth of tubes, but with some grunt behind them to push big woofers happily.
I must admit - the Harsch sounds best. My only doubt is the miniDSP only has one option for Bessel but looking at the curve it emulates I think its a 2nd order which is what is required. I tried emulating that with LR + BW and the relevant delay but it doesn't come out as clean.

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Originally Posted by mkane77g View Post
These work great for driving woofers
Mmmmm - I think I will stay away from tinkering with voltage. I had a little scary moment with my amp going into protection mode and I thought we overcooked the right full ranger as the soldering tabs are tiny and we had a few goes at doing that. Turns out it was a grounding issue in the RCA's that worked fine in another system. If you can share the details of your build I'll take a look at the complexity and reconsider my courage levels !

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Originally Posted by Godzilla View Post
jklow888, those look great! Would you share a picture of the back of the speaker? Id like to see how you are supporting the baffle. Looks like you have come up with a simple and clean solution. In addition, have you considered powering the Alphas with their own amp and the TBs with their own amp? Thats what I would do.

The back and feet were modeled on the Spatial M-series - I'm sure many will say its not sturdy enough/brace it etc but I didn't want to go that route and my wife wanted a clean look/not ugly/no massive box behind it etc. The baffle is 43 mm thick made of lamellas so strong yet flexible to avoid warping that you get in a solid sheet of timber - I'm happy with the sound and its better than my boxes ! The feet are solid aluminium with two countersunk holes and then I use two M6 60 mm screws to couple each foot to the base which has a 5 mm notch to keep the foot from rotating. Each foot has two tapped thread holes for spikes which then allow me to set the baffle face to perpendicular given the minor tolerances on the feet cut outs. Wiring is run through each driver rebate with the main 6 core sheath going round the bottom woofer and exiting by the bottom woofers 2nd lowest re-inforcing rib:

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Amplification - I do intend to bi-amp low and high separately. Of course cost is a factor with tube amps and this project has take a fair amount of time and money (but worth the exercise). The Emotiva XPA-5 has plenty power as a starting point but the higher efficiency and something in the front area of the room is now revealing a DC hum which is irritating in silent passages. I have a Jolida hybrid that does 75W which I think should be plenty for the woofers given no passive xover components in the way so am thinking of a Glow One for the full rangers or some other locally built tube amp around 6-8 watts. If the Jolida is not enough for the woofers then I will look at a SS amp that is quieter than my Emotiva.
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Old 22nd February 2018, 12:21 AM   #2454
gadut is offline gadut  Indonesia
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Originally Posted by Godzilla View Post
...Id like to see how you are supporting the baffle. Looks like you have come up with a simple and clean solution...
how about like this? 2x18mm marine plywood baffle, 2x18mm mdf on the base. with lots of bass from bluray movie, only small vibration that I feel when i touch the baffle
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Old 22nd February 2018, 12:43 AM   #2455
perceval is offline perceval  Taiwan
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Quote:
Originally Posted by jklow888 View Post
I must admit - the Harsch sounds best. My only doubt is the miniDSP only has one option for Bessel but looking at the curve it emulates I think its a 2nd order which is what is required. I tried emulating that with LR + BW and the relevant delay but it doesn't come out as clean.
Now, next step is to not rely on the miniDSP own curves, but make your own.
Especially since XSim now includes a PEQ and export of biquads into the miniDSP, you can trim the FR and woofers response to follow the real curve used in a Harsch and gain even more clean sound.

Quote:
The Emotiva XPA-5 has plenty power as a starting point but the higher efficiency and something in the front area of the room is now revealing a DC hum which is irritating in silent passages.
That DC hum is probably some other units on the same supply. Anything from ceiling lights (neons and LED often introduce noise into the electric feed) to fans, etc.... There are products out there that will help isolate these issues.
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Old 27th February 2018, 02:36 PM   #2456
gadut is offline gadut  Indonesia
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Default OB with audio nirvana classic 8

just replaced my fullrange with Audio nirvana classic 8 and it sounds superb. t90a with 1.5uf does not any need any lpad now, it blends nicely

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Old 22nd March 2018, 10:53 PM   #2457
ScottG is offline ScottG  United States
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Originally Posted by mkane77g View Post
Active crossover 4th order BW low pass.
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-now that's a good design.
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Last edited by ScottG; 22nd March 2018 at 10:57 PM.
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Old 23rd March 2018, 07:33 AM   #2458
oido is offline oido  Sweden
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Default Narrow open baffle (kind of)

Here is the latest result of my pursuit of a narrow OB with plenty of low bass. Four ten inch woofers working in tandem, i.e. not pressurizing the space between them. Eight inch Faital coax on top.
Steel frame with dual layers on front and back baffles, with absorbing material constrained in between.
Mostly fourth order passive filters. Sensitivity around 86 dB, but very amplifier friendly impedance and phase angles.
What stands out most is the very natural transition between bass and midrange, the unforced liveliness, dynamics and articulation of the bass and that it easily goes down into the mid 30 Hz range (-6dB @ 34 Hz rel. 200 Hz)
oido audio
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Old 23rd March 2018, 08:44 AM   #2459
matejsirk is offline matejsirk  Slovenia
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Originally Posted by oido View Post
Here is the latest result of my pursuit of a narrow OB with plenty of low bass. Four ten inch woofers working in tandem, i.e. not pressurizing the space between them. Eight inch Faital coax on top.
Steel frame with dual layers on front and back baffles, with absorbing material constrained in between.
Mostly fourth order passive filters. Sensitivity around 86 dB, but very amplifier friendly impedance and phase angles.
What stands out most is the very natural transition between bass and midrange, the unforced liveliness, dynamics and articulation of the bass and that it easily goes down into the mid 30 Hz range (-6dB @ 34 Hz rel. 200 Hz)
oido audio
Very nice work and design. Could you tell us more about the drivers you used? From the pictures we can see that the middle woofesr are different that bottoms.
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Old 23rd March 2018, 10:03 AM   #2460
oido is offline oido  Sweden
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Thank you matejsirk. The top pair of woofers are highish qts (0.55 if I remember correctly)and fairly low fs. They have very nice attack, but limited low frequency (below 40hz) output. Bottom pair are higher qts, lower fs drivers made for ob and go much deeper but not with the same snap. Together they create a wonderful combination of both
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