Look at my new babies...Altec 846Bs w/EV Tweeters!

[JBLRaiser]

I would rather be able to bring my pair with me at the time of the listening and I would like Jeff to do the same.

Can't we just change the date of the shootout?

Thanks.

-Storm.

real close male friend to sit in the booth for you?

[Zilch]

16 Ohms.

Don't know what Moldy was looking for, but I'm guessing it's not there. :dont-know

Well, we can forget Ch. 1 for right now.

[That's a clue to fixing it, tho.... ]

[sourceoneaudio]

16 Ohms:

Well, we can forget Ch. 1 for right now.

[That's a clue to fix it, tho.... ]

Yes Capitan, she seems to be sagging a bit>>>>>>>>>

What is the other amp?


J/S-S1A

[Zilch]

What is the other amp?

Sonic Impact Super T-Amp.

[sourceoneaudio]

Here's what you've likely got to deal with:

http://audioheritage.org/vbulletin/s...857#post159857

If you want to send your drivers in here, I'll be pleased to measure them....



Well, maybe not for this application. Factory recommended crossover frequency 8 kHz or higher, alas:

http://www.madisound.com/pdf/fostexdrivers/ft96hrev.pdf

Zilch,

Thanx for posting that. Nice, the recommended x-over point is one full octave away from the low side of the frequency response. By looking at the curve it seems it would be safe at 18db per octave at 5k? Yes, No, Maybe? The driver seems pretty flat up to 8k from 5k

J/S-S1A

[Zilch]

By looking at the curve it seems it would be safe at 18db per octave at 5k? Yes, No, Maybe?

I'd be asking Fostex tech support before doing that.

Kinda like 077/2405, maybe. Yeah, it'll play there, but you don't want it to once you hear it....

[sourceoneaudio]

I'd be asking Fostex tech support before doing that.

Kinda like 077/2405, maybe. Yeah, it'll play there, but you don't want it to once you hear it....

Copy that, harshness will set in, I did not bring up the pdf on it. I was just going off of the frequency response posted. Out of all those types of UHF drivers listed on that page I posted that is the only one that puts the recommended x-over point an octave above the starting frequency.

J/S-S1A

[moldyoldy]

16 Ohms.

Don't know what Moldy was looking for, but I'm guessing it's not there.

You'd be-a guessing right. Since 3dB is considered the breakline for "signifigant", that's what I was looking for, at least in the 5-10k octave anyway...(and thought I heard)

I assume the T-amp is 8 ohm out? If so, we at least verified the XO's dual input rating.

If not too late, bang it once from the EICO 8 ohm tap for me, so the carefully thought out stipulations will be fullfilled, but I'm warming up the PayPal button anyway.

MZ$%&(($$^&f'ing subjective evaluations, anyway!!!

But the knowledge is priceless! Down with speculation, long live empirical testing!!

(Just let me at that NFB circuit with my iron for 5 minutes....)

ADDED

Just for the record, No mention has been made how REALLY easy the fix would be for the average non-curve-junky. No $, no science, almost no effort. On the front panel of the preamp is a little knob marked "Treble"........

but that's not the point of this endeavor.

.

[Zilch]

I assume the T-amp is 8 ohm out? If so, we at least verified the XO's dual input rating.

My bad, forgot the XO. That's raw driver response.

I'll redo after dinner, 8 and 16-Ohm taps.

It's all still set up; I know better from experience here than to tear down right away.

Don't know how the T-Amp is spec'd, but I'll look that up, also....

[moldyoldy]

"My bad, forgot the XO. That's raw driver response."

Moldy konks Zilch with a bottle of Ritalin!!

Bet you play a mean game of chess.

[VTUBE6]

[quote=Zilch;161676]Here's what you've likely got to deal with:

http://audioheritage.org/vbulletin/s...857#post159857

If you want to send your drivers in here, I'll be pleased to measure them....

Thanks Zilch, that is a very kind offer. I may indeed pull the speakers apart this weekend. If I do, I will PM for your address and such and will get them sent off. Your measurements on the BMS 4550s are pretty doggone good. You are right, for most, I can't imagine needing any more UHF extension than that. BTW, just got into the Assistence Audio site...finally. Thanks!

Rob

[Zilch]

Bet you play a mean game of chess.

You'll be figurin' out what's wrong with Ch. 1 in the meantime, I jus' KNOW it....

[moldyoldy]

It's FUBAR. Take it off your hands for another Franklin.

[Zilch]

It's FUBAR. Take it off your hands for another Franklin.

Yer cathode's ungrounded, apparently....

[moldyoldy]

Go eat your s'getti-os. I'll think about it.

Okay.

1. First, adjust the chassis-mounted humpot (paralelled on the filament string) on the pre to see if you can kill the hum. I didn't check, there may be one on the main too.

2. Then isolate the problem to the pre or main.

3. First natural suspects are caps and controls, but since the response stumbles a quick ~5dB, then tracks at that level, I don't think so, as the tone circuits are active feedbacks (not cheapo RCs or even somewhat-better Baxendalls like "progressing technology" gave us later) with respective center frequencies of 50Hz and 10kHz.


Clean your tube sockets and pins too. Excessive stray R does funny things. DeOxIt knocks it!