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Multi-Way Conventional loudspeakers with crossovers

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Old 25th September 2012, 07:30 AM   #51
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Very, very nice work!
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Old 25th September 2012, 01:30 PM   #52
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Very nice!

Some listening impressions already?
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Old 25th September 2012, 04:15 PM   #53
gornir is offline gornir  Sweden
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Hi guys,

Thank you!

Hopefully I will find time this weekend to finish the second loudspeaker and later on do some frequency and distortion measurements on the 10C woofer.

I haven't done any listening tests yet, but I will as soon as I hook them up to my active DEQX system. I use the DEQX to get the feeling how the drivers behave and to quickly test different cross-over points etc.

When I'm done with the DEQX testing I will do the frequency measurements that will be used for the passive cross-over simulation and design .

Regards

/Göran
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Old 12th October 2012, 05:20 PM   #54
Jozua is offline Jozua  South Africa
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Hi

Any news re progress

Jozua
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Old 14th October 2012, 07:58 AM   #55
gornir is offline gornir  Sweden
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Quote:
Originally Posted by Jozua View Post
Hi

Any news re progress

Jozua
The project is moving forward, but slowly.

Both loudspeaker cabinets are finished. Some minor adjustments remain e.g. building front covers for them and fixing some beauty spots.

I’ve done the woofer measurements as well as some DEQX measurements, but I haven’t had the time to do the write-up on the woofers and create correction filters for the DEQX.

Soon I hope I will have them up and running actively crossed-over with the DEQX pre-amp.

These loudspeakers are a pain in the *** to measure since they without cross-overs weigh about 55kg each and are tough to move around!

Currently I’m also working with a new two-way called “Revelation Two – Monitor MkII”. It uses the ScanSpeak 15W/4531G00 mid-woofer and the D3004/660000 tweeter. So far everything looks good and I’m in the final voicing stage of the design process.

I’ve attached some pictures of the Grand Reference build. In real life the loudspeaker looks darker than the picture. They are dark grey in daylight and almost black in the evening.

/Göran
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Old 14th October 2012, 08:59 AM   #56
tinitus is offline tinitus  Europe
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Old 14th October 2012, 06:37 PM   #57
gornir is offline gornir  Sweden
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Quote:
Originally Posted by tinitus View Post
I take it as a compliment!

/Göran
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Old 14th October 2012, 06:43 PM   #58
tinitus is offline tinitus  Europe
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its just nice to see a real speaker
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Old 23rd October 2012, 07:09 PM   #59
gornir is offline gornir  Sweden
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Hi everone,

Here's a small status update of the loudspeaker build!

AudioTechnology 10C772510KAP Measurements!
Sequence Three – Grand Reference Construction Update4!

The last driver measurement to publish for the Sequence Three – Grand Reference loudspeaker design is the AudioTechnology 10C772510KAP 10” woofer. This woofer uses a very stiff rigid thick (2mm) sandwich cone. For its size it has an extended flat frequency response, with a cone break-up at approximately 1.9kHz.

Besides Troel Gravesens measurements, I haven’t seen any independent measurements made for this woofer. One thing that differs my measurements from Troels is that his cone break-up occurs higher up in frequency (2.5kHz), compared to my measurements.

In my case this is not an issue since I intend to cross-over the woofer to the mid-range somewhere between 3-400Hz. Even though the frequency response is very flat I doubt anyone would use this woofer any higher than 5-600Hz.

Next, I will connect the Sequence Three – Grand Reference loudspeaker to my active DEQX HDP-3 system and start some listening and cross-over testing.

Regards

/Göran
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Old 23rd October 2012, 08:48 PM   #60
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I don't like saying it, but all things considered those are pretty poor distortion numbers for the 10", not to mention the rather large differences between the two of them. I'd have expected better consistency for a driver of this cost.
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