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Old 3rd February 2006, 01:42 PM   #531
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by poynton
Simon, got the sick bag ready????

I paid 15 for 10 inc. postage! HeHe

Andy


Classic Ebay bargain!

My fave so far that I got was 128 7" bass drivers for about 70.

Altho my 2kva isolation tx was a good buy too, think that was 35, or maybe less.
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Old 3rd February 2006, 01:54 PM   #532
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by SimontY




My fave so far that I got was 128 7" bass drivers for about 70.


Ok - I have to ask - what on earth do you do with 128 7" bass drivers???

( apart from reselling them singly on Ebay for 5 each )
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Old 3rd February 2006, 02:08 PM   #533
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by poynton
Ok - I have to ask - what on earth do you do with 128 7" bass drivers???
Augmenting the bass range of my speakers (inc. bi-amping) and particularly
http://www.diyaudio.com/forums/showt...232#post831232

I'm having a go at making my speakers into 3-way by rolling off the current mid/bass section and introducing some extra cabs loaded with these babies. 8 per speaker isobaric push-pull is what I am knocking up right now, and it could be ok, certainly should take a LOT of power.

Also, we modified 6 (removed cones, added steel bar across frame, blocks of wood etc.) to use as floorshakers in my friends bassment. We also used 4 in his 'bar' area to bring up the midrange and upper bass in there, just mounted in-wall.

So that's 10 down and possibly 16 to use in the current project...

Quote:
(apart from reselling them singly on Ebay for 5 each)
Yes, I have considered this and will probably try a few and see if anyone takes them. They're decent enough units and I can sell them with a suggested cabinet or even plans, so I think it's a nice product for a fiver. And good markup!
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Old 3rd February 2006, 02:27 PM   #534
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Ray quote
Quote:
Do not, by any means, run the clock off the +12V!!!!
The Audiocom clock runs off of a +9V to +18V supply.

I gave the option to run it from the standard 12V cct short term.

I have my clock running from a 12V audiocom reg supplied from the now barely used +20V rail.
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Old 3rd February 2006, 08:25 PM   #535
Franz G is offline Franz G  Switzerland
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My latest modifications: second tranny with rf filter, fast rectifier and some caps for the audio voltages.

Absolutely great players, this marantz series.

Franz
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File Type: jpg gessner_tweaks_second_mods.jpg (91.1 KB, 970 views)
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Old 5th February 2006, 03:16 AM   #536
6h5c is offline 6h5c  Netherlands
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Hi Franz,

Nice job, it's starting to look like a KI already .

What's the PCB floating above the HDAM cans? Some PSU filtering?

Regards,

Ray.
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Old 5th February 2006, 06:21 AM   #537
Franz G is offline Franz G  Switzerland
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Quote:
What's the PCB floating above the HDAM cans? Some PSU filtering?
No, this is a simple LC low pass filter (ca. 50kHz/12dB).

All the modifications are according to Gerald Gessner. The audio part consists just 50% of an OPA2134 followed by the LPF.

Franz
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Old 5th February 2006, 09:29 AM   #538
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by Franz G


No, this is a simple LC low pass filter (ca. 50kHz/12dB).

All the modifications are according to Gerald Gessner. The audio part consists just 50% of an OPA2134 followed by the LPF.

Franz
Hi.

How close does the tray come to the Tx / board??

Do you have a link for this mod??

Andy
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Old 5th February 2006, 09:32 AM   #539
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by 6h5c

.................It is an exact copy of Thorsten's circuit.................

Hi.

Did you keep any of the original filter after the DAC or did you change everything as per Thorsten's circuit????

Andy
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Old 5th February 2006, 01:11 PM   #540
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by poynton
Hi.
Did you keep any of the original filter after the DAC or did you change everything as per Thorsten's circuit????

Andy
Hi Andy,

I took out the resistors directly at the outputs of the DAC and connected it to Thorstens filter instead. The circuit sounds very good, but I have some HF noise present in my tweeters. I'm now figuring out if it is radiation from my nearby clock PCB, or because the circuit uses only one output and thus it is not cancelled out in some way.

Quote:
Originally posted by Franz G
No, this is a simple LC low pass filter (ca. 50kHz/12dB).
All the modifications are according to Gerald Gessner. The audio part consists just 50% of an OPA2134 followed by the LPF.

Franz
Franz,

Do you have a schematic of the passive circuit you use?
Is there any noise residue with this passive circuit?

Regards,

Ray.
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