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Recording, Mixing, Performance and Production
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I have a small Fostex PS3.1 monitor system; powered subwoofer that also houses amps for the small 2-way satellites. Recently I've picked up a cheap set of Sony bookshelf speakers with 6.5" woofers and a hi-fi amp. The Sony's have a much more balanced mid-range, but lack in low end that the subwoofer of the Fostex provides. I would like to use both systems in parallel but defeat the satellite speakers using load resistors in place of the speakers. What is the best way to measure the impedance of the satellites? Using a simple multi-meter with the speaker leads removed shows an impedance of 4.2 Ohms. Would I be able to used one of these 4 ohm 100W load resistors in place of each satellite?: http://www.parts-express.com/4-ohm-100w-non-inductive-dummy-load-resistor--019-015The amp in this system really doesn't come close to 100W output, and I probably don't need this kind of power dissipation capability, but it was the easiest to find at 4 ohm.
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Recording, Mixing, Performance and Production
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Why not use the two systems independently? Just pick up a cheap sub at a garage sale, and you have two complete systems. I picked up an Infinity 100 watt sub for $20 at a garage sale.
Regards,
Bob
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Bob, my eye is on the lookout for a nice powered sub. Then the whole Fostex system will be likely be put up for sale. The sony bookshelf speakers and the pioneer amp were acquired independently at thrift shops for a grand total of 21$ so far. If I can get a decent powered sub that's not blown for that I'll be a happy camper and the Fostex system will probably be gone. There's not much room for both systems. The Sony speakers are kind of big. If I keep the Fostex, I will have to build some type of wedge bracket for them to sit on top of the Sonys. If I can figure out how to post a photo here from Flickr I will post it. 
Last edited by rockstar_not; 09/08/15 05:19 PM.
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Scott, Looks like you have some space on the sides of your console - why not get a pair of speaker stands (or wall mounts) and get your big speakers a bit farther away from your mix position? They look a bit close. p.s. The Infinity sub I got at a garage sale is an 8" down-firing speaker with a 100 watt internal amp. It's so powerful, I hook it up to our small PA for rehearsals.  Here's one you might look at: http://cosprings.craigslist.org/ele/5206003798.htmlRegards, Bob
Last edited by 90 dB; 09/09/15 01:37 AM.
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You can probably use the sub by itself and simply leave the satellite speakers disconnected.
It's Ohms law at work..... solid state amps develop more power the lower the load becomes. that's why many solid state amps have warnings on the speaker outputs not to go below a certain speaker impedance. The higher the impedance, the less power they will deliver. An open circuit with no speakers will not develop any power. If you place "loading" resistors on the outputs, the amps will see it as a low load and try to produce the power at that load level. Most modern amps will not be harmed by open outputs. But,,,,, if that freaks you out....
To use loading resistors...... read this>>>
You are also dealing with 2 different resistances.... first, you have the DC coil resistance which is what you measured with the meter.... 4.2 ohms. That is a constant. It will always be that number.
All coils have inductance and therefore inductive reactance or AC resistance when an alternating current is passed through them. This inductive reactance will vary depending on the frequency. It is 90 degrees out of phase with the DC resistance and adds to that 4.2 ohms at that 90 degree angle. It will give you a certain resistance at a given frequency. Added to the DC coil resistance, it determines the impedance of the speaker. It's for this reason that most speakers are rated at 8 ohms or 16 ohms at a given freq.... IIRC 1000hz for test purposes (might be lower for larger cone speakers).
All that to say, if you wish to go the power resistor route.... go with 8 ohms and rate the power dissipation accordingly.
You can find my music at: www.herbhartley.comAdd nothing that adds nothing to the music. You can make excuses or you can make progress but not both. The magic you are looking for is in the work you are avoiding.
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Thanks for the replies.
As for close-ness of mix position, I should snap another photo with me sitting at the desk. I would say that the distance between the face of these speakers and my mix position is probably 2.5-3', though I haven't measured it.
I've never mixed loud, and my hearing is still pretty decent the last time I had an audiogram done a couple years ago.
I should note that the bigger speakers are not nearfield monitors. I seem to recall reading many moons ago that if one is not using speakers designed for near-field like these bookshelf stereo speakers, that getting them closer to the ears, and mixing at lower levels is the preferred way to go. I don't have a source for this.
-Scott
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I dunno, I'd think one of the features of NearFields would be to have true representation at closer range/less volume. I'd assume turning down a set of non-NearFields would more likely affect performance of the actual speaker.
So I'd probably move them back a bit instead.
Just my way of thinking. I don't have a source either, and I'm sure every speaker is different.
As far as the amp, I wouldn't worry about resistors if it was me either.
Not sure if having a load or not would affect crossovers.. if they were active crossovers .. worst case the sub may get some higher frequency signals which it couldn't produce well anyway.
Make your sound your own!
.. I do not work here, but the benefits are still awesome
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When you add the satellite speakers, you are decreasing the impedance (load) the amp sees because the load is wired in parallel, which actually means the amp develops more power. I think Herb is correct, particularly about the fixed impedance of one speaker, but here we are talking about two or more as the load for an amp: leave the satellite speakers unplugged.
A long time ago, I attempted to use my Peavey PA head as just a mixer. I thought it would be wise to place some resistors in place of the missing unpowered speakers. Knowing the amp was capable of 400 watts into 4 ohms, I thought I would be safe and used large 100-watt 2-inch long resistors on each channel. I did not even turn up the volume, but within seconds, the resistors were melting. Powered down real fast!
I concur with Rharv that unless the monitors were designed to be near-fields, they might work better at more distance (but still at ear level).
I concur with Scott about mixing at low levels, and I've said that here many times. There's a lot less ear fatigue over a long session. I always check a mix by turning the mix volume to barely audible, and if I can hear all the parts, I know it will work when turned up.
BIAB 2024 Win Audiophile. Software: Studio One 6.5 Pro, Swam horns, Acoustica-7, Notion 6; Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors
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