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In Reply to: RE: Tympani IVs in a 12x 22 x9 room posted by neolith on May 15, 2017 at 11:24:31
Being too ignorant to know what I could or could not do, I biamped Tympani 1Cs using ARC's EC-2A X-O. To my favor I might add that there was no Internet around back then for advice, perhaps neither was Al Gore, (but he might have been in diapers). I used GFA-555s along with ARC D76As as well as the original GAS Ampzilla. Using the Bass and Tweeter level controls on the rear of the EC-2A, I had zero difficulty in adjusting levels. (IIRC a D-76A also had useful level controls.)
Follow Ups:
I was only going by the specs provided by Adcom. A amplifier that produces 200 wpc @ 8 ohms with a sensitivity of 130 mV has a gain of ~50 dB. This is extremely high and I would have expected the sensitivity to be more like 1.3 V (gain = 32 dB) but those are the numbers. Since you got the amp to work with the D76A (gain of 25.5 dB), it suggests the specs are in error.
I married the perfect woman. The downside is everything that goes wrong is my fault.
I wish I could confirm that today, but I parted ways with the D76As about 25 years ago. While they had no difficulty driving 8 ohm Tympani 1Cs they were not up to the task with my 4/3(?) ohm Tympani IV-As. So I sold the D76As to a tube enthusiast and the 1Cs to another individual. (In fact, D76s and T-1Cs were supposed to be a marriage made in heaven.)
When I got my 1-D's, the SOA arrangement was to biamp them with D-76A's -- something that as a kid with his first job and apartment was out of my reach, so I had to settle for a single Hafler instead.
The first pair of Maggies that I heard were T-1Ds biamped with the D76 and,IIRC, a D110 using the ARC active crossover (EC 2A ?) I have been listening to Maggies ever since.
I married the perfect woman. The downside is everything that goes wrong is my fault.
IME the D76A couldn't handle a 4 ohm Maggie (and in fact was discontinued in ~1977) while the Tympani 1D was introduced in 1980.
Naturally that wouldn't prevent any listener having access to the D76/A from trying to use it on a T-1D. I know because I tried using D76As (bridged, or not) to drive any of the sections within a Tympani IIIB (4/5 ohms) and failed. OTHOH that amp was up to the task of driving the Tympani IIIA (8 ohms).
The Magnepan/Audio Research Corp. team expected listeners to use an amp providing more current than could a D76A, for use on their Tympani 1D.
Classic. They were the first Maggies I'd ever heard as well and that was the pair I bought.
A Crown 5002 taken out of a closed down club is available near me. It is said to be in working order. What is a fair price for it? And what should I look out for?
I was going to demur to Satie, but I see he's already answered . . .
There is also a Crown K2 available from this club closure. How does it compare to the 5002?
Cheap and well regarded at its price point the K2 is OK. Definitely not a 5002. The 5002 is in a different class. The 5002 listed at $5k.
Everything I read indicates the Crown should be driving the bass panels. Can the Adcom be used on the MT panels?
Depending on what the Crown costs, I will have $500 - $1000 left in my budget. In order to bi-amp, I need a crossover. I can have my Adcom GTP-500 preamp serviced and use it though I would prefer a tube preamp.
As always, open to suggestions and solutions.
If you are going to have a Crown 5000 series or Macro Reference then start by using it for the entire speaker. and play that way for a while till you established how it sounds in your room once it is optimized as to positioning, Since those are 30-40 year old speakers they will need a shake down period to reveal delamination or any other problem they might have. That might eat the budget for biamping for a time - so don't prepare for it just yet. Once you are sure what you have has been repaired and will function for some time into the future then you start working towards tweaking the speaker and amplification.
Note what you find unsatisfying or lacking and then work with us to offer mods tweaks and to apply biamping and possibly DSP.
Thanks for the good advice Satie, as always. I see how easy it is to get sucked into the acquisition of one piece of equipment after another.
Will the Schiit SYS passive preamp work for the Crown or should I dig the Adcom preamp out?
The adcom preamp will do a better job so if you have one buried somewhere then do dig it up.
The 5002 will be delivered tonight for $750. It and the Adcom GTP-500 preamp will go in for service this weekend.Will the 5002 find the typical household 15 amp circuit adequate? Preamp and CD player will be the only other things plugged into that outlet.
Edits: 05/24/17
you can try with an extension chord to a 25 amp outlet that you get at home depot. The amp can take up a big portion of the 15 amps on startup so it needs to sit on a circuit (not just outlet) with no big power draw on it. Before I put in a separate panel for my basement listening room it was all off of one breaker and when the dehumidifier or sump operated switching on the amp could put you in the dark. Hopefully your living room outlets have nothing on their breaker circuit.
The Crown 5002 that I picked up is wired for 240v but apparently can be converted to 120v. Is there a preference for home use?
Also in addition to what Satie said 240V is balanced, so less likely to cause hum. The power company is doing you a big favor for free.
Downside, it's more dangerous if something goes wrong. You should also order new 240V connectors and receptacles (if you've rewired it yourself) so nobody plugs a 120V device into the outlet. I did that once when I moved into a new apartment with a miswired outlet and the next morning, discovered that my new torchiere lamp had melted!
Make sure you have a full 240V, if the cheapskate power company have you 2 legs of 3-phase commercial power like me you'll only have 207V and are better off using a single 120V line.
The preference is for the power rating you have available to you. If you have a 240 outlet for your room then it would be better to use that, gives more power.
Should be around $1500 depending on condition.
It is a matter of what it sounds like more than what it looks like. It could have been used in a badly ventilated rack and still look like it just came out of the box despite components being half way fried to death.
In a club environment the amp has a better chance to survive intact than a touring life on the road..
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