I just saw the picture of the underside and circuitry, and it looks to have a shared/common ground. I thought Class D/T amps didn't have a shared ground? When I was messing with the HE-500 with speaker amps, one of the limitations on using a speaker tap to TRS adapter was the requirement of a common ground, and all of the sub $100 class D/T speaker amps on the market had separate grounding and would go up in smoke if connected with a TRS adapter. And to get a balanced cable generally defeated the goal of a cheap speaker amp solution (to keep it economical). The king of affordable speaker amps for headphones ended being the Emotiva MiniX which is an AB amp and has a common ground, but is also $220. It's nice to see a potential new solution to the affordable speaker amp for headphones quandary.
Bam!
- Thread starter Doc B
- Start date
kgoss said:
Note to PB - I have attached a link to the full bill of materials for the Quicksand SLA battery adapter kit.
http://www.mouser.com/ProductDetail/3M/FDI18-250Q/?qs=SfU69DRKVGBj%252bw1YFkqIaw%3D%3D&gclid=CjkKEQjwodmdBRDm_ZLhorWm68UBEiQAKhO3_TzDJjUcXQ6SeXN3xDP2uRsp9BVJ2xyUV4oStf2a5Wjw_wcB
Grainger49
New member
That's FUNNY ! !
Bonzo said:
There are provisions for padding resistors in the manual (and we include them). A 4 Watt amplifier isn't dangerous to power hungry planars or orthos. If you'd like to run Grados with this amp, you will need to install the supplied padding resistors. (But really, running hyper efficient, low impedance headphones on a 4 Watt per channel amplifier isn't the most sensible plan to begin with)
fullheadofnothing
Moderator
The first handful are either shipped or are in a pre-shipping limbo. The limbo ones will be out the door tomorrow. Still have some parts to get in for the rest, not really sure about timing quite yet.
The volume pot is doable, but most portable sources tend to already have a level control built in.
-PB
-PB
irishpatrick33
New member
This is so close to what I have been longing to build: a hybrid loudspeaker power amp that can run off batteries (even better if it could be remotely triggered)--the holy grail, I'd say.
I don't have the know-how or the bravery to mod the Quickie and Quicksand into my true desire (bypassing: headphones, source switching and volume controls).
I don't have the know-how or the bravery to mod the Quickie and Quicksand into my true desire (bypassing: headphones, source switching and volume controls).
The source selector on the Quickie is also the power switch. To mod it to just be a power switch, you can reduce its switching positions from 3 positions to 2 before installing the switch. To bypass the level control, you can move the wiring on the pot slightly once it's working to turn the pot into a pair of 100K resistors.irishpatrick33 said:
The headphone jack doesn't interrupt the speaker feed from the Quicksand, so there isn't a huge need to bypass it.
Can the quicksand handle a 6 ohm speaker? I'd like to try my hand at diy and the quickstand seems like a good place to start. Right now I currently only have a pair of the pioneer sb22 speakers but plan on getting something from Blumenstein. I'm in a townhouse so volume isn't that important. Maybe 75db max.
