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PostPosted: 18 Dec 2016, 20:53 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
A (dark) photo of the main listening room.

Attachment:
AN-Classic-5-OB-Stereo.jpg

The fullrange unit is a Audio Nirvana Classic 5". The Bass units are Eminence Alpha 15A in a tubular H-Frame. A pair of oddblocks drive the top end and a DIY Pass F5 for the bottom. The XO is an Ashly XR1001. The XO point is 300 Hz. The in-room response is shown below.

Attachment:
AN-Classic-5+Eminence-Alpha-15A-fr.jpg

The baffle step rise occurs from about 400 to 700 Hz. The hole between 200 and 400 is related to the XO point and baffle step. A lower XO sounds better but the hole gets bigger. This has me thinking that I may be able to get better performance with an active 3-way crossover so I can set two different XO points for the woofer and the fullrange driver. Fortunately the Ashly unit I got is 2-way stereo / 3-Way mono, so the upgrade to 3-Way stereo would require another unit and they are not expensive. Based on the plots and different XO points I tried, my gut tells me the 5" fullrange should have an XO point of about 100Hz and the 15" about 300Hz. With the right slope that should fix the hole.

I'm not sure if I should get another of the analog ashly units or perhaps try a digital crossover like a DCX2496?


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PostPosted: 10 Aug 2017, 21:01 
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I got a chance to get a whole new set of speakers going in my main listening room. Open baffles once again with the same bi-amped system.

Attachment:
Open-Baffle-Speakers-Audio-Nirvana-Classic8-Goldwood-GW-1858.jpg

The fullrange driver is a Audio Nirvana Classic 8 (8" / 200 mm) on an open baffle. The Bass units are Goldwood GW-1858 (18" / 460 mm) in an H-Frame. A pair of oddblocks drive the top end and a DIY Pass F5 for the bottom end. The active crossover unit is an Ashly XR1001. with a crossover point set 175 Hz. The measured in-room response of the open baffle loudspeaker system is shown below.

Attachment:
AN-Classic8-GW-1858-inroom-frequency-response.png

After proper room placement, I was thrilled with the performance from this speaker combination. The measured in-room response was excellent, about +/-5dB between 32 Hz and 12 kHz. The Audio Nirvana Classic 8 driver is very smooth and very well balanced for this size of full range driver. Another plus is the 18" Goldwood rolls off flatter than the 15" Eminence Alpha-15A. The 18" Goldwoods are solid to 32 Hz and the 15" Eminence to 40 Hz. Both my ears and the in-room measurements seem to confirm that this is may well be my best sounding speaker system to date. Down to 32 Hz and very natural sounding bass. Yes. Big and ugly, but they sound fabulous!

I believe the dip between 60 and 90 Hz is a room related issue. The dip between 200 and 400 Hz I suspect are a result of the limitation with using 2-way crossover (one crossover point) as this dip is generally consistent with all the different fullrange drivers I have tried. I'm considering a miniDSP 2x4HD as a crossover upgrade in the near future.

Cheers


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 Post subject: Re: Gio's Audio Rooms
PostPosted: 10 Aug 2017, 23:32 
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Joined: 08 Aug 2009, 03:11
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Location: Chilliwack, BC
Big, but not ugly at all! :D

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 Post subject: Re: Gio's Audio Rooms
PostPosted: 11 Aug 2017, 09:01 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
Those bass divers sure do look big.

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 Post subject: Re: Gio's Audio Rooms
PostPosted: 11 Aug 2017, 10:34 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Big, yes, getting into the territory I'm in (7 cubic foot /200+liter range). You can get good sound from smaller enclosures and drivers...but you can't get around Thiel's big three...size vs power vs low frequency. In audio you can't have it all. Any two, but the third one will bite you.

I've been pondering it I could turn my fireplace into an infinite baffle sub....maybe with the pair of 15 inchers I already have. Hummm. :angel:

Good listening
Bruce

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