Hi-power Plate amplifier - give your input

John E Janowitz · 10-30-2002, 06:40 PM

Hi Everyone,

Don't want to get too far ahead of myself yet, but I'm working with someone on developing a high power plate amp right now. Before I say much of anything on what I have planned, I'd like to know YOUR input.

What power level would you want? 500W? 1000W? 2000W?

What features would you want? Adjustible subsonic? Adjustible lowpass? Crossover defeat switch? Built in parametric EQ? Please comment on any of these, or anything else you may think of.

What kind of target price would you be interested in? This would be dependent on pricing and features, but give me an idea of what to shoot for.

After I get some input, I'll give an idea on what I have planned so far.

John

Kyle Richardson · 10-30-2002, 06:56 PM

I was speaking with John about this amplifier this afternoon and it sounds VERY promising. Yes, folks 2000 watts is possible at a low ohm rating.
So you're thinking to yourself "Sure, they can provide a 2000 watt amp but at a price tag of at least $1000-$1500" Think again

But, maybe 2000 watts is way overkill and most everybody will be happy with much less? We dont know so thats why we need everybody's input. We also need to know what options you guys want the most and what ones you can live without.

Speak up!

MichaelAngelo · 10-30-2002, 07:01 PM

John,

Sounds like a welcome project!

An amp rated at 700-800 watts would be nice, give a bit of headroom vs the PE amp.
Adjustable subsonic, say 5-20 hz, would be a must-have.
Ditto X-over defeat.
An option for the EQ would be cool too.

Price? Don't know enough about these things to suggest a price.....

I would've said 1000 watts but the idea of the price scares me-- Kyle, is it possible it won't break the bank?

Anthony_Gomez · 10-30-2002, 07:20 PM

I would like to see:
*1000watt @ 4 ohms plate amp (fanless is always nice

)
*variable 2nd order rumble filter 5-20hz
*selectable cnd or 4th order LP filter over 40-120hz (and defeatable)
*infinately variable phase
*1 or 2 parametric EQ filters would be nice (though I wouldn't need it).
*also, a balanced input option would be cool for those of use that use the BFD.

or something that would be more specialized but REALLY REALLY COOL:
*1500watt @ 4 ohms plate amp (fanless is always nice

)
*NO rumble filter
*selectable cnd or 4th order LP filter over 40-120hz (and defeatable)
*infinately variable phase
*built in variable LT (like the BASIS)
*also, a balanced input option would be cool for those of use that use the BFD.

Kyle Richardson · 10-30-2002, 07:25 PM

Anthony, these would be fanless.
Michael, it all depends on how large your bank is. These will be reasonably priced considering the power they provide and the features you want on them. Obviously, the more options that are put on the more they will cost. Of course you cant set pricing, but give us an idea about what you would want to spend.

**HTF Ads**

MikeAcc · 10-30-2002, 07:32 PM

1000 watts @4 ohm
24db xover 35-150, 200

0-180 phase

Detachable power cord

the built in LT and balanced input for BFD would be cool.

Depending on price, the built in Para EQ would be sweet.

Anthony_Gomez · 10-30-2002, 07:48 PM

Kyle/John, will these be Bash amps re-badged like the SVS amps?

Brian Bunge · 10-30-2002, 08:21 PM

Tony,

A lot of what you're looking for seems to be available in the Hypex amps. I'd love to see something like the HS500 model at a bit cheaper price.

Anthony_Gomez · 10-30-2002, 08:26 PM

Brian, depending on which model I am talking about.

I don't think any has a variable rumble filter w/o soldering. The built in LT is a work in progress by dan. The HS500 has a fan (which isnt too big of a deal since it is only sometimes on). There isn't a balanced input.
The power output is up to 3db in difference for the larger one.

Jonathan M · 10-30-2002, 08:26 PM

My suggestions: (I probably won't be buying one though - not for a few years anyway)

1000W is a good target - especially with the new low-sensitivity gigantic Xmax drivers coming out now.

Parametric EQ is best done elsewhere IMO - it'll be too costly to add a decent amount of equalization to satisfy everyone toa plate amp. External solutions aren't too expensive, anyway.

Linkwitz Transform on board is ideal - this would include the sub-sonic filter. These need not be externally adjustable IMO - just adjustable by substituting different value caps/resistors would be sufficient for most people. Make sure any resistors/caps here are hole-through, and not SMD!!

As for the low pass, this should be 4th order Linkwitz Riley and adjustable/bypassable. I don't think a true variable xover is needed - just some set values such as 40,60,80,100,120 is enough - most people either have it turned up high (ie try to bypass) or have it around 80Hz or so anyway. Variable Phase control would be a must - just like on most plate amps nowadays - the circuit is so simple it should be easy enough.

No need for speaker level inputs or high passed outs - this is for dedicated sub only use.

Just my thoughts!

Anthony_Gomez · 10-30-2002, 08:44 PM

Quote:

Linkwitz Transform on board is ideal - this would include the sub-sonic filter.

a Linkwitz transform should NOT be used with a subsonic filter. Just the 1st order buffer with an Fc between 5-14hz. The group delay REALLY goes up with a second order filter

Quote:

These need not be externally adjustable IMO - just adjustable by substituting different value caps/resistors would be sufficient for most people. Make sure any resistors/caps here are hole-through, and not SMD!!

being one that has gone through all the handswaping, I vote for the Basis aproach. to do the hand swapping, you need LOTS of measured caps and resistors on hand. Also, being able to change the Q on the fly for music and HT would be really nice.