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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old 9th October 2017, 08:42 PM   #2211
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by Siberia View Post
Nice tip.
I'm always buying leather ones. My 3d set arrived just two weeks ago. Changing them every two years or so. It would be interseting to try velours.
Different pads swapping makes serious differences in the frequency response of all headphones. Sometimes irregular differences. But those velours make the DT150 not only softer and breathier to wear, they also linearize its response a lot. Depending on the genres of music preferred it may be a good thing or not. If listening to Reggae or EDM or watching movies you would probably prefer the bass boost of the vinyl pads for instance. Reminds of sizeable speakers in a room kind of bass. It does not bleed into masking the mids though. Anyway they will be nice to also have because they are an original Beyer inexpensive pair of pads that does things.

By the way I have done continuity tests in their input socket pins and it looks like that the signal returns are individual for the channels. The first pair of side by side pins across are + + second row are 0 0 last more spaced row are no connection possibly reserved for the side-mic version. Maybe we can all recall images of TV crew guys, especially studio cameramen, wearing elongated cup phones with a big pilot's like side-mic attached. Those were Beyers. So a "balanced" i.e. bridged drive cable can be possibly DIYed for them if needed when getting a spare connector.
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Old 10th October 2017, 12:07 AM   #2212
alexkosha is offline alexkosha  United States
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Salas DCG3 preamp (line & headphone)
I absolutely agree with Salas about pads. I followed some forum advice and upgraded my Monolith m1060 with Vegan Audeze made pads. I also installed felt made “phaser”. It is amazing how good they sound with my DCG3. These pads are bit pricy, but definitely worth $100 price tag.
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Old 10th October 2017, 03:19 PM   #2213
Salas is offline Salas  Greece
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You had to forcefully remove the old ones and use glue for the new? The Monoliths do not have removable pads provision if I remember correctly from their early reviews.

Arguably the most popular pads swap for a planar phone is putting Alcantara ones from Shure on the Fostex T50RP mk3 which has awfully uncomfortable original pads. To best keep the original sound though, its better to remove the back filters form those Shure pads (part# HPAEC1540). Unless a bit heavier than the original mk3 tone is actually preferred.
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Old 11th October 2017, 01:05 AM   #2214
alexkosha is offline alexkosha  United States
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The nice thing about Audeze pads that they come with double side adhesive already pre-cut rings that perfectly match Monolith driver diameter. It was very easy to remove original pads and I also removed original adhesive. 2 min deal. I used that video as a guide, but I glued rings first and then fitted phaser.
YouTube
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Old 11th October 2017, 01:20 AM   #2215
Salas is offline Salas  Greece
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Aha! The felt bits really do a job on the original's mid-high resonance. That's a clearly measureable upgrade.
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Old 11th October 2017, 01:38 AM   #2216
alexkosha is offline alexkosha  United States
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I can say for sure that my AKG k701 is definitely show that 5k resonance particularly when I play some CDs and these also got that issue. Not that pronounced, but it was there. Nothing like that after upgrade. All frequency range is very smooth and they beat my Alf AKGs (Austria made) easily. Friend on mine has LCD-2 and after our tests Iím not sure which one I like more. For my humbled and subjective 50 years old ear they sound the same, pretty much. I think about cable upgrade too, but did not lock yet on wire that Iíll use.
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Old Today, 06:28 AM   #2217
Siberia is offline Siberia  Lithuania
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Quote:
Originally Posted by Salas View Post
So a "balanced" i.e. bridged drive cable can be possibly DIYed for them if needed when getting a spare connector.
Those Beyers are indeed a broadcasting and studio classic. Different models and impedances for different applications, but structurally it makes sense to build them the same.

Anyway, learned so many great things again here, Salas. Thank you. What would be the benefit of the "balanced" connector if for example integrating it to my future DCG3. A disadvantage would be that my headphones would suit the only device?
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Old Today, 07:45 AM   #2218
Salas is offline Salas  Greece
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Its for when you build a doubled up balanced DCG3 because you want to use it in a source to power amp completely differential system, like a couple of members already did here, you can also drive cans floating between the phases. The voltage swing ability doubles. Its alike the bridged mono thing in sound reinforcement and car audio amps for extracting two channels power through a single output.

In the DT150's case it can only be down to you can also make a DIY cable if you will need compatibility to gear like some new DACs sporting four pin XLR "balanced" HP outputs too. Because its an easy 100mW max load. There is a widespread enough claim that any cans owe to sound better when connected between hot to hot. Expensive third party cables for the purpose are on offer for split channels return wiring able popular models like the HD650 etc.

The technical truth though is that when things are equal regarding needed swing ability and power reserve from classic SE hot to earth and "balanced" headphones drive, there can even be actual cons in the latter case.

Read this short article from a well known US studio gear company named Benchmark. Its covers the essentials about those modes of headphones driving: Audio Myth - Balanced Headphone Amplifiers are Better - Benchmark Media Systems, Inc.
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