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Old 23rd March 2011, 07:33 AM   #1
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Default Do I have enough power (RMS)

My amp puts out roughly 90-100W RMS, and was wondering if I have enough juice for this CDT set?

http://cdtstore.com/hd_series/hd_62as.htm

my amp Reference Hi-Fi! Your Factory Authorized Dealer

Last edited by ma_tt316; 23rd March 2011 at 07:54 AM.
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Old 23rd March 2011, 02:10 PM   #2
Dr Zeus is offline Dr Zeus  United States
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Interesting amp; I've never seen or heard of one of them before. Made in the USA in Washington too. The insides look like this amp most likely runs with sets of TIP35c/36c transistors (Darlingtons) with what looks like a regular power supply running off of two IRFZ4x fets. This amp looks a lot like my AutoTek 22 amp from back in the day.

I dont know if just one pair of TIP35c/36c has enough to what it takes to make 90w in each channel without knowing the rail voltage... but I think it should sound absolutely fine with those speakes. Nice setup btw.

Click the image to open in full size.

Click the image to open in full size.

Last edited by Dr Zeus; 23rd March 2011 at 02:12 PM.
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Old 23rd March 2011, 02:15 PM   #3
Dr Zeus is offline Dr Zeus  United States
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Woops.. Those pics are from an a90 but you posted that you have a C90. Basically the C90 is just the 4 channel version of the A90; so I presume double the parts inside.

The speakers handle 200w rms meaning you might be able to bridge your C90 amp from 4 channels down to 2 channels. It should sound good either way.
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Old 24th March 2011, 08:39 AM   #4
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I know the guy that designed those amps. Sure they aren't made from the highest quality parts, but they will do rated power.
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Old 24th March 2011, 12:21 PM   #5
amc32 is offline amc32  United States
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Actually this is a Massive Audio P200.2 the four channel version is called a P400.4.
The output and pre-drive section is the same. I have seen several models use tip 35/36 "note these are not darlingtons" and large case Toshiba. Excellent amplifier when its working properly. Slighty inflated output numbers and powersupply could use some upgrading, but all in all a better to great made Korean amp.
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Old 24th March 2011, 12:22 PM   #6
amc32 is offline amc32  United States
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will post pics if anyone needs them
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Old 24th March 2011, 12:32 PM   #7
AndrewT is offline AndrewT  Scotland
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Hi,
is that a 1pair output stage?
Who is kidding who?
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Old 24th March 2011, 01:10 PM   #8
amc32 is offline amc32  United States
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not much meat on this amp,but it works. Sadly though the powersupply is just as or even weaker than ouput section. Using only one fet per phase. But it works but don't abuse it. Most of the ones that I see for repair is because of the power supply fets.
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Old 24th March 2011, 02:26 PM   #9
Dr Zeus is offline Dr Zeus  United States
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I guess your right about TIP35/36 not being Darlingtons... Thats strange through because I thought PPI's larger Powerclass amps used TIP35/36 and I thought those amps were stated to be of Darlington design. What I know now though is there are better sounding amps than the PPI monster's I've had and worked on.

...Not to change the subject, but the OP posted up some pretty expensive speakers. Why not give them speakers the clear power they deserve?

If you want an awsome little kicking "Darlington" amp, Check out this Soundstream MC140x. I was given one for repair (See threads I've started on this forum), and I've had it in my car ever since while working out a few bugs from time to time. With all the amps I've seen on my bench, this little soundstream has beaten them all in terms of absolure SQ distortion free clean power. I wish it was a little more reliable, but I've finally fixed all the issues last month. With it I run a pair of el-cheap-o $40 DB Drive door speakers and everyone complements on how freaking awsome it sounds.

The MC140x is rated for 30x4 watts RMS, but I bridge mine down to two channels for 90w each. They use TIP101/106 or TIP102/107 outputs.

They dont come on eBay very often... but here you go.

SOUNDSTREAM MC140 4 CHANNEL SQ AMPLIFIER ~ OLD SCHOOL | eBay

Last edited by Dr Zeus; 24th March 2011 at 02:31 PM.
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Old 24th March 2011, 02:51 PM   #10
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The darlington configuration isn't necessarily related to the transistors used in the circuit. It's determined by the way the transistors are connected.
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