Replacement PT question
I have a Knight KN-728B that needs the power transformer replaced. The original PT is: 640VCT 130ma 6.3VCT 5.5a All I can find are a couple of Edcor's that are close but not exact. - 600VCT 200ma...
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Simple Router (then bass management)
Hi guys, I registered a long time ago but life got in the way of DIYing and didn't get very far. I'm now in need of a box to re-route or bypass a signal. I have 6 outputs from my sound card. These...
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150 Hz horn backchamber
Gentlemen, I have a 150 Hz tractrix horn mounted with a BC 8PL21 driver. The backchamber is suitably small I believe. This is the impedance plot of the system: I would like to have your opinion on this...
View ArticleHow high a compression ratio possible in A tapped horn??
The Usual recommended compression in a TH is 2:1 but SPL level increases with higher compression. For heavy strong cone drivers has anyone tried to go with 4:1 or higher. Have a low QTs, high Xmax,...
View ArticleQuestion about changing Cabinet design
Hi all, I've searched and can't find anything regarding my concern. I am putting together Zaphs ZDP 3.5 design and want to go with curved sided cabinets. Given that the horizontal cross section will be...
View ArticlePCM1704 NOS Strange Clipping
The DAC seems to work properly in the beginning a nice sinusoidal can be saw in scope, but 1 minute after, a clipping in negative zone is slowly growing up to a certain level. Both channels L and R are...
View Articlesoundcard max (safe) input voltage
Does anyone know what is the maximum voltage that can be applied to the line level input jack of a soundcard without damaging the soundcard? This is of course assuming that the safe level is the same...
View ArticleWhat size subwoofer
Hello , I just completed a nice pair of bookshelf speakers Using a pair of Fostex fe103en drivers. I next need to design A subwoofer using a plate amp but I'm conflicted About the size of the driver. A...
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Layout challange: Dual Maggie AMP148 based.
Having played with the small 9302 Magnavox 6BQ5 PP stereo amp for awhile, I've caught a second case of tube amp syndrome. I heard of another Magnavox tube amp used in Imperial and Concert Grand. Amp...
View ArticleRebuilding an HT sub for "down-firing"?
I'm basically keeping the same box volume and port tube, just facing the speaker at the floor. It's an 8 inch driver. How much space will I need between the speaker (and port opening), and the floor?
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FR on wide-baffle (OB/IB)
So, I've purchased the Dayton PS220-8's from Jeff in the 'Parts Swap' section and am playing around with some simple/cheap ideas for the bedroom - and of course not intrusive - very very high WAF! So I...
View Article8 ohm polarity question...
I often have to wire speakers that are two 8 ohm on one channel and two 4 ohm on another... It always seems like when I put the two 4 ohm speaker together in series that the polarity gets flipped. I...
View Articlewhat is hmr oro 3ohm f
I need to replace this resistor and cannot find any info on it.please help!oh yeah it is out of a memphis 16 mch 1300 location 490 on the board
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Tube Arcing?
So I have a Mesa Boogie that a friend wants me to look at. I can say the internal layout is a mess. You have to unsolder a bunch of wires to actually get the main board out. Anyways his message to me...
View ArticleOverkill, but interesting board
I just came across this, mobile site-F451# 1000W high power amplifier board 2SA940 + 2SC2073 TTA1943 + TTC5200 Was hoping it would be big enough to not need a transformer.
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FS Power Physics A-404 400 watt Class-D modules
I have several Power Physics A-404 400 watt Class-D modules these are nice small modules, 400 watts at 4 ohms with 1200w peak power and 200 watts at 8 ohms with 600 watts peak power. I have a very very...
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3-1/2" OEM Mid drivers FS
Next up I have several types of 3-1/2" Midrange drivers. These are OEM auto types but were made for a very very high end brand. First up are some nice metal cone with a large metal dome drivers with...
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FS: Tang Band W2-852SH 2" Shielded Speaker Driver
I have several Tang Band W2-852SH 2" Shielded Speaker Driver's for sale. all appear to be new. some have the very top of the dust cone dimpled. These are $21.58 at parts express Tang Band W2-852SH 2"...
View ArticleESL hybrid
Hi! i have been planing to build an ESL design, and i've chosen to start with the "jazzman" design, because it's pretty well explained, and i've no experience with ESL, so, it's a pretty good starting...
View ArticleMiniDSP 2x8 as pro audio "driverack"
Who here is using one for a driverack on their pro amplifiers? (Balanced) I would like to do a 4 way active system and need 7 channels of DSP. The 8th could do stereo subwoofer processing, but not...
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