[steve k]

Email Tom. He's there now, I just heard from him.
steve

[poseidonsvoice]

E-mailing Tom is probably your best bet, however, if you can:

Give us the model number of the Antek transformer you are using.

Most likely the brown wires are additional 12V secondaries which may or may not be used (i.e. they can just be tied off if not used).

The red and black wires are primary wires. Tie the reds together and connect it to AC live or HOT (with a fuse and switch in series). Tie the blacks together and that is connected to AC neutral. This is only for a 115V/120V North American connection. If you live overseas, where there is 220VAC then see schematic below.

See schematic for 115V AC here.

See schematic for 220V AC here

Best,
Anand.

[mcgsxr]

You kids have captured my interest.  As I pursue the right amp to power my passive HT sub, I keep coming back to this thread...

I have emailed Tom some questions, I might find myself building a mono sub amp in the near future, if I can sort out which is the right option for me.

Considering Pro Audio amps too, for my install, so not 100% sure of direction at this point.

[gitarretyp]

Now the big question.  There are two brown wires coming out of the transformer and I do not see any documentation on where to connect it up.  Same question related to the two red and black wires.

Close up pictures of the amp to powersupply connections would be much apprericiated.

TIA,
Deepak

I'm guessing you ordered one of the kits with an upgraded transformer? If so, the brown wires are extra 18 V secondaries and should be tied off, as Anand suggested.

[gitarretyp]

You kids have captured my interest.  As I pursue the right amp to power my passive HT sub, I keep coming back to this thread...

I have emailed Tom some questions, I might find myself building a mono sub amp in the near future, if I can sort out which is the right option for me.

Considering Pro Audio amps too, for my install, so not 100% sure of direction at this point.

Honestly, I think it's really tough to beat pro amps for subwoofer applications.

[steve k]

As I pursue the right amp to power my passive HT sub

Interesting timing. Tom has been tweaking his 250wpc/8 ohm amp for me to run my bass panels which are 4 ohm. He designed a larger heat sink to dissipate the heat without using a cooling fan. To test it, he ran a passive sub on each channel all weekend at loud volumes. He claims it works fine. The mosfets he's using don't double at 4 ohms but this amp might be an option for you.
What's funny is I liked my Hafler DH-500 on the bass panels until I got Tom's 120 wpc amp for my mid panels and ribbons and it's so quiet, I really notice the fan noise on the Hafler now. So this might be the ticket. More later.

steve

[shadowlight]

Thanks Guys.  Heard back from Tom and here is what he had to say:

"The brown wires are extra 12V wires… not used for this kit, but can come in handy if you ever want to use it for a small preamp power supply or?
 
Just tape off the brown wires.
 
The two red get tied together, and the two black wires get tied together… this is for 115VAC here is the USA.
 
Make sure the two wires that go to CT are the green and blue from the center of the four wires."

I ended up purchasing the following kit which includes a 400VA transformer: http://classdaudio.com/index.php/class-d-amplifier-kits/home-kits/250w-x2-500w-x1-amp-large-power-supply-transformer.html

[gitarretyp]

That's the same model I decided to go with, and I was considering using the extra secondary taps for something along those lines --building a buffer, such as the Pass B1, into the amp could be a fun project.

[jtwrace]

Just ordered another amp... 250 x 2.  Curious to hear that one compared to the 300 x 2. 

[steve k]

Just ordered another amp... 250 x 2.  Curious to hear that one compared to the 300 x 2. 

Cool! It should be interesting to hear first hand a comparison between the TI chip and the IR chip. Mine is on the way too. Should be biamping with 2 Class D's this weekend. Woohoo! 

steve

[pjchappy]

Very well!  Should have it finalized early next week.

Any updates on this?  Although I probably won't get the amps for a couple more months, if there is a group buy on these cases, I would likely be in for 2.   


Paul

[jtwrace]

Any updates on this?  Although I probably won't get the amps for a couple more months, if there is a group buy on these cases, I would likely be in for 2.   


Paul

No updates yet...I'll post pics when they are done.  Probably a couple of weeks at least.  I'll be sure to keep everyone updated once I have more info. 

 

[jkelly]

Can someone tell me what size fuse to use with the 250 x 2 amp?

Thanks,

Jeff

[Steidl Guitars]

Jeff, somewhere I saw that a 6 amp slow blow was recommended. 

That's second hand information, though, not direct from Tom.

[zapper7]

Following the thread with interest, never did an amp build, but what the hey.

Does anybody know the dimensions of the amp and supply board, and the diameter and height of the 400va trans, looking to get a head start on the chassis.

Went with the $325 500wx2 kit.

Thanks

[jtwrace]

Went with the $325 500wx2 kit.

Thanks

What speakers are you driving that you need that much power?

[zapper7]

I have a large room and a hunger for power. I have tried the PS Audio/ Bel Canto 120w and 500w and prefer the 500w sound, maybe the headroom, I don't know. I roll speakers in and out, so from 87db to 95db efficiency.

[jtwrace]

I have a large room and a hunger for power. I have tried the PS Audio/ Bel Canto 120w and 500w and prefer the 500w sound, maybe the headroom, I don't know. I roll speakers in and out, so from 87db to 95db efficiency.

Cool.   

[steve k]

Just a thought...Those of you who've tried Tom's amps now and like them might want to drop a quick review of them on his website.

I'm still waiting for my 250/8 ohm model. Some parts got delayed by the weather if you can imagine that.  Can't wait to get all Class D on my maggies. 

steve

[macrojack]

I received a box from Class D in today's mail. Should I open it?