Mr. Foxen

Better explanation would be where those ideas come from, because I've seen stuff like that posted a few times, and usually claiming some sort of authority from 'experimentation' or a formula that doesn't apply to the situation, whilst ignoring the massive flaws in the internal logic of the situation.

There is more to matching speakers to a cab than ohms and watts. In fact, ohms and watts aren't very relevant at all. Do a search for "winISD' on here and there'll be a ton of threads running through how it works.

[quote name='Musky' timestamp='1338317467' post='1672709'] On a side note, my Harley Benton BA500 (500w at 4 ohms) has a specified power consumption of 170w. I thought it was a typo until Mr Foxen pointed out that other class D amps he'd been looking at had similar power demands. Anyone have an explanation of why this is? I would have sided with Dincz in saying that this is completely impossible, but now I'm totally confused. Something strange going on with the power factor perhaps? [/quote] Basically RMS isn't putting out the absolute maximum it can forever. Music isn't like that, and that is why RMS is the more relevant value to music.

Speakers aren't a resistive load. And you need to have a scope or other means of determining when you are at max clean output, or it doesn't tell you anything relevant.

Oh yeah, and a bunch of the tone is in the power section, so you need a DI that goes after the output, and a cab or inductive dummy load.

Open it up and follow the wires round, and get a meter on each speaker.

For Ampeg, new one under guarantee, all good. S/H, budget for a service when buying, they are a giant pain to work on when they start going wrong.

[quote name='dincz' timestamp='1338311001' post='1672561'] On this I have to say that's absolutely untrue. Every amp I've ever bench-tested could deliver a higher voltage swing into an open circuit than with a load connected. [/quote] How exactly do you measure voltage across an open circuit?

[quote name='dincz' timestamp='1338280996' post='1671926'] Why? Because he didn't mention instantaneous power. As written it amounts to perpetual motion. [/quote] Didn't specify anything. Output watt ratings are pretty much meaningless anyway, so it is fully valid to be able to have a rating above the consumption, because amplifier output isn't like mains output.

Power demands in music aren't constant, and capacitors are cheap.

Big transformers for bottom. The higher bit is a bit more interesting, C-cores are used in super duper mic stuff, apparently due to better high end performance, but I don't know if the advantage is too high for audio. Some of my very fancy amps have C-cores though, more exciting than the Partridge ones that are excellent but I have tons of.

[quote name='Dad3353' timestamp='1338252158' post='1671777'] Valves were (and still are...) used at RF transmitter frequencies, and radar. There is nothing inherently 'slow' about valves, at least in anything like audio frequencies. Cite your sources, please..? [/quote] [quote name='paul_5' timestamp='1338247690' post='1671738'] fact. [/quote]

[quote][size=3][font="Arial"]PLEASE DO NOT BID IF YOU HAVNT GOT THE MONEY TO PAY FOR THIS ITEM...[b]I WILL LEAVE BAD FEED BACK [/b]AND CALL YOU A WORD THAT SOUNDS A LOT LIKE "PETROL-TANKER" [/font][/size][/quote] Bet he won't. All seems fair really, you have to deal with a lot of numpties selling on ebay. recently had a guy open a case against me because shipping to Europe was 50p extra, and a guy saying my price for a 60s amp was too high because he could get a new one cheaper.

You have a Barefaced cab. Introduce a weight limit per band member based on the weight of all yours.

[quote name='paul_5' timestamp='1338247690' post='1671738'] That is a scientific fact. [/quote] Citation.

[quote name='paul_5' timestamp='1338247328' post='1671730'] valves are slower than transistors [/quote] Which bit is slower? I like SS in the rectifier stage.

[quote name='BB3000S' timestamp='1338246565' post='1671719'] Could be a sign they are incredibly narrow minded as well. [/quote] Not quite following the logic there?

When someone uses one amp for 30 years, that's a good sign they know what a good sounding amp for them is. If they are changing it all the time, either they want a broad range of experience to draw upon, or they just can't get a good tone.

[quote name='EssentialTension' timestamp='1338245644' post='1671699'] He was just talking about how it sounded to his ear. That is a valid basis and whether he's been inside it is irrelevant. [/quote] [quote name='Mr. Foxen' timestamp='1338244874' post='1671679'] Reliability and fixability matters, however much you like the sound it makes, doesn't count if it isn't making sound. [/quote]

[quote name='BB3000S' timestamp='1338245141' post='1671687'] Are you talking about me in the highligjted section? Did all of BC wake up on the wrong side today? My Ampeg is a B-15 reissue, not a POS in my mind but there you go... [/quote] That's the thing. How much amp work is that opinion based on? Ever been inside it? Got gutshots from when you did? Opinions don't gain validity without basis.

[quote name='AttitudeCastle' timestamp='1338244505' post='1671669'] If for you an SVT 2 pro plus what ever bass and cabs you use is sonic perfection to you, that's all that matters. [/quote] Reliability and fixability matters, however much you like the sound it makes, doesn't count if it isn't making sound. [quote name='umph' timestamp='1338244573' post='1671671'] Don't think oli owns an ampeg, he owns lots of amps with proper iron and non sag based power supplys though. [/quote] I used to own an ampeg, it would have been the worst amp I ever owned, except I have one that is 100v line out only which ranks it as slightly more useless on a potential basis, although it would have been cheaper to have converted than to have the Ampeg brought up to standard. Massively annoys me when people pick a boutique example of one thing and a cheaply made nasty POS for the other and think it makes a valid comparison.

[quote name='BB3000S' timestamp='1338243523' post='1671649'] You are cordially invited over to have a test run on my Aguilar DB-680 + Lab1000 + Bergantino AE410 rig. Maybe it sucks, but to my ears it blows my all valve Ampeg out of the water easily in terms of creamy goodness. [/quote] I would say that would be more to do with Ampegs being seriously badly made devices. I've not been into an Aguilar amp, but I've heard good things.