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post #1 of 10 Old 05-11-2017, 01:54 AM - Thread Starter
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FS: Upgraded Crestron (ATI) 16x60 Amp; Now 11channel: 5x200W@8Ohms + 6x60W@8Ohm

Upgraded Crestron (ATI) 16x60 Amp; Now 11channel: 5x200W@8Ohms + 6x60W@8Ohm
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This amplifier was a pet project of mine to provide the ultimate all in one amplifier for my home theater. I am a computer engineer who started out as a technician so I enjoy keeping my technician skills fresh along with my analog engineering skills.

This is now probably the most flexible home theater amplifier around. I haven't found anything commercially available that can match what it can do. It can be configured as:


Unbridged: 16x60W
2 Channels Bridged: 2x200@8ohm, 12x60W
3 Channels Bridged: 3x200@8ohm, 10x60W
4 Channels Bridged: 4x200@8ohm, 8x60W
5 Channels Bridged: 5x200@8ohm, 6x60W
(specs with all channels driven!)

This means that one amplifier can drive 11 channels in a home theater system which is enough to drive all of the base layer and atmos speakers in a 7.x.4 setup.

I started with a very nice used Crestron unit that is in very good cosmetic shape. It has one light scratch on the front which I did a closeup and distant shot of. It really isn't very noticeable but I want to fully disclose that it does have a few skuffs with this one being the only one on the front panel.

It is a modified Crestron 16x60 amplifier that removes the crestron control blocks and changes the main relay to the 12v version of the original. This makes it a 12V triggered home theater amplifier (the 12v trigger or a 12v DC power supply is required, a 12v DC supply is included).

Each of the boards in the 16x60 contain two amplifiers that are identical in design to the crestron 2x60 amplifier except they don't have the bridging circuit. An expansion board was added along with a high quaility audio switch to replicate the bridging functionality of the Crestron CNAMPX-2x60 amplifier. To match my home theater requirements I modified 6 of the boards (one spare) and made 5 of them brdigeable. The remaining 3 boards are unmodified. Bridging can not be used when driving 4 Ohm speakers.

Crestron amplifiers are top quality amplifiers for home automation and are built in the USA by ATI who makes very high end amplifiers with their own branding and also others like Lexicon. All of the amplfier boards even have ATI logos on them.

I tested each channel of this unit after the modifiction comparing it to a 2x60 amplifier to ensure that they work identically.

The unit is VERY heavy weighing an honest 90lbs without packaging. Shipping is unlikely to be cheap so local pickup in the Phoenix area is available. I have shipped heavy units without any issues in the past and will pack the amplifier very carefully using appropraite packaging.


Specs from Crestron:
Note that the 200W at 8 Ohms spec is from the 2x60 amplifier. The only difference is that this is on a single board and it uses a shared larger toroidal transfomer.

Typical of 8 Stereo Room Outputs:
Output Power 20Hz to 20kHz, all outputs driven at rated THD:
60 watts per channel at 8 ohms
90 watts per channel at 4 ohms
220 watts at 8 ohms bridged (channels 1-4 and 13-16 only; requires CNXBRMO, no longer available)
200 watts at 8 ohms bridged (using the modified board and circuit form the CNAMPX-2x60)
Power Bandwidth 3Hz to 50kHz, +0/-3dB
Frequency Response 20Hz to 20kHz, +0/-0.1dB at 1 watt, 8 ohms
Total Harmonic Distortion (THD) ≤0.03% at full power
IHF I.M. Distortion ≤0.01%
SMPTE I.M. Distortion ≤0.03%
Dynamic Headroom ≥2dB
S/N Ratio >110dB A-weighted
Gain 28dB
Damping Factor >400
Channel Separation >100dB, 20Hz to 20kHz
Power Requirements
Main Power 120 Volts AC ±10%, 50-60 Hz, 1800 Watts
Cresnet Power Usage 12 Watts (0.5 Amps @ 24 Volts DC)
Environmental
Temperature 41° to 104°F (5° to 40°C)
Humidity 10% to 90% RH (non-condensing)
Enclosure
Black metal, 4U 19-inch rack-mountable (rack ears included)
Dimensions
Height
7.69 in (19.53 cm);
7.0 in (17.78 cm) without feet
Width 17.18 in (43.64 cm);
19.0 in (48.26 cm) with rack ears
Depth 17.45 in (44.32 cm)
Weight
90.2 lbs (41.0 kg)
Nexgen76 and hlnoiku like this.

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Last edited by rfb6435; 01-13-2019 at 01:16 AM.
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post #2 of 10 Old 05-11-2017, 07:15 AM
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This is a nice amp. I currently use a Emotiva LPA-1, and so far it has been solid. It would be nice to this though! Good luck with the sale.
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post #3 of 10 Old 05-14-2017, 08:12 PM - Thread Starter
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Quote:
Originally Posted by GusGus748s View Post
This is a nice amp. I currently use a Emotiva LPA-1, and so far it has been solid. It would be nice to this though! Good luck with the sale.
Thanks,

It was a really fun project. I just have too many amps so I am sellign some off. This crestron amp and my Adcom gfa-7607 are being sold.

I don't think there are many amps out there that pack this many channels into one box that the Crestron 16x60 does and with the mods being able to bridge 10 of those channels into 5x200 gives it even more flexibility.

The Crestron specs are .04 THD so this amp should actually go well over 80W on the non bridged channels before 1% distortion especially if not driving all channels at a constant 80w.

-Rich

Quad Marantz AVR 9.2.(4+2) Atmos/DTS:X using Dual sr7010's + Dual scAtmos nr1403's
Marantz MM8003 150W/ch Amplifier Driving (L/C/R/SL/SR/SBL/SBR)
HTD Speakers L3 Tower L/R, L3 Center, Dual 12" L3 Subs, L2 Tower SL/SR, L2 Bkshlf SBL/SBR, Flat Panel WL/WR, Angled 6.5" In Ceiling FH/RH, 8" In Ceiling TM
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post #4 of 10 Old 05-18-2017, 11:15 AM
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Very impressive work!
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post #5 of 10 Old 01-12-2019, 12:08 PM
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I guess it's sold by now?

I'm looking for one in the UK, but just thought I'd ask if it's still available.
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post #6 of 10 Old 01-13-2019, 01:18 AM - Thread Starter
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Originally Posted by UKenGB View Post
I guess it's sold by now?

I'm looking for one in the UK, but just thought I'd ask if it's still available.
Yes it is sold now. I apologize for not updating the listing.

If you are looking to re-create the bridging project I have sold a couple of copies of the bridging schematics.

-Rich

Quad Marantz AVR 9.2.(4+2) Atmos/DTS:X using Dual sr7010's + Dual scAtmos nr1403's
Marantz MM8003 150W/ch Amplifier Driving (L/C/R/SL/SR/SBL/SBR)
HTD Speakers L3 Tower L/R, L3 Center, Dual 12" L3 Subs, L2 Tower SL/SR, L2 Bkshlf SBL/SBR, Flat Panel WL/WR, Angled 6.5" In Ceiling FH/RH, 8" In Ceiling TM
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post #7 of 10 Old 01-13-2019, 01:47 AM
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I won't be wanting to bridge, but I will be wanting to convert to 12V trigger operation. Is there a full write up of that I can see anywhere?
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post #8 of 10 Old 01-13-2019, 10:15 AM - Thread Starter
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Quote:
Originally Posted by UKenGB View Post
I won't be wanting to bridge, but I will be wanting to convert to 12V trigger operation. Is there a full write up of that I can see anywhere?
There is another thread that I posted in that showed how to do a 24v trigger. Unfortunately my unit didn't work with the instructions because my crestron board didn't activate the circuit properly.

What I ended up doing was removing the output board relays and replacing them with an 18ga copper wire. Many amplifiers don't have that extra protection so it was acceptable. I then changed the main relay out with an equivalent 12v version (same case, same compnany, different voltage).

The output board relays could be changed to be 12v by replacing them all but there are 16 of them and it would likely cost $8each....

Or you could just do a 24v trigger. That could be done by removing the crestron board and connecting all of the relay lines to the 24v trigger (I think there was 1 trigger line per board driven by the crestron power board). The easiest way to do that would be to just remove the crestron board and either make a new board to connect to it or just strip back all of the wires and connect them to your trigger/ground appropriately.

I didn't fully document the crestron board. I am not sure if I still have the board I removed.

-Rich

Quad Marantz AVR 9.2.(4+2) Atmos/DTS:X using Dual sr7010's + Dual scAtmos nr1403's
Marantz MM8003 150W/ch Amplifier Driving (L/C/R/SL/SR/SBL/SBR)
HTD Speakers L3 Tower L/R, L3 Center, Dual 12" L3 Subs, L2 Tower SL/SR, L2 Bkshlf SBL/SBR, Flat Panel WL/WR, Angled 6.5" In Ceiling FH/RH, 8" In Ceiling TM
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post #9 of 10 Old 01-13-2019, 11:40 AM
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So there's a relay on each amp board, or is there a separate 'output board' that handles power switching for all amps? Is that in fact the Crestron board?

Anyway, simply replace all those relays with fixed 'bridges' and then swap the main relay for 12v? Sounds like the best solution. That is basically what I had in mind.

BTW, I just managed to grab an international (240v) amp off eBay. So I'm getting all my ducks in a row before I collect the amp and hack into it.
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post #10 of 10 Old 01-13-2019, 12:32 PM
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Take the discussion to PM, please


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