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Re: what power rated speaker shoud I use with my str-d865
Home Receiver - Dolby Pro Logic - 1995 Related Models
<< STRD665 ($300) | STRD965 ($400) >>
Here's the specs, see below but looks like 100Wx2 speakers at 8ohms.
Features: A/V remote; Digital Signal Processing w/ 6 soundfields (Dolby Surround, Hall, Theater, Stadium, Game, Acoustic), Soundfield link; 30 presets; 4 audio/ 4 video inputs (1 tape monitor); sleep timer
Specs: Stereo: 100w x2 into 8 ohms (20-20k Hz) at 0.3% THD; Pro Logic: 100w x3; Surround: 25w x2; subwoofer preout; FM sens. 11.2 dBf; 17" W x 5 3/4" H x 14 1/2" D
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Fuses don't tend to blow on their own. The chances are that there is an overload somewhere. Caused by a shorted part.
There's a video on YouTube of this model and it is full of STK chips mounted on heat sinks. Check all of them out. Look for signs of damage such as burning.
I can see why you're asking for help on this. It almost seem this unit has been 'disappeared' as far as online information is concerned. Even Sony has nothing on it.
I founs some articles and For Sale posts:
"Sony's STR-4800SD receiver was extensively, and positively, reviewed in Stereo magazine's Fall '77 issue. In their introduction, they found the 4800SD bettered its published f.m. sensitivity specs "by a wide margin...it has exceptionally smooth frequency response, very low distortion(especially in the midband), and excellent quieting. No exotic claims are made for the power amp section, either (35 watts/channel,15.4 dBw at 0.2% THD). But our tests indicate much more capability than that, and a distortion of only one-tenth that spec."
The power consumption figure shown in a photo below says "145W", which would be consistent with a 35 watt amplifier.
This is a common question on this site. Amps of all types have protection circuits to
keep them from doing a self meltdown. Testing follows this logic.
1. Remove all speaker wires.
2. Keep the volume down - all the way.
3. Turn the unit on.
4. If it does not trip off, then there is a problem either in a speaker or the wiring.
a. Reconnect one at a time until/unless it trips off
b. That will tell you where to look further.
If it does trip off, then there is an internal circuit issue in the amp and probably
requires professional help to fix.
That's a protection circuit in the output of the speakers. It indicates a short, or abnormally low resistance of the speaker itself. Disconnect the speaker wires from the unit, and see if the message goes away. If it did, you have a problem with your wiring, or the speaker itself.
That model of receiver goes into protect mode when there is really low resistance or a short on your speakers/wires. It does it to protect the final drivers in your amp. Does it do the same thing with all of your speakers disconnected? If it doesn't then you might have a problem with one of your speakers or wires. Check your wires for shorts in them first. That may be the only problem. That model is designed for 8 ohm speakers, but you can go down two 6 ohms safely. I have a STR -D865 that
has been running 6 ohm speakers safely for almost 3 years now. A way to check your speakers out is to take an ohm-meter across the terminals on them(with the receiver unhooked). They should read anywhere between 8 and 4 ohms. Check with the manual on your speakers to see if they correspond. If the resistance is really low, you may have a short in that speaker. it is also possible that if they are 4 ohm speakers, you could have damaged the drivers in your receiver. I know the model above mine, (the 965) has a 4-8 ohm speaker selection switch on the back. The lower models were not designed to run 4 ohm speakers. Hopefully this has
I have experienced a similar problem with my Sony STR-GX57ES and took it to a certified tech only to find it needed the power supply replaced. I opted to hunt down a compatible power supply but have been unsucessful thus far. That being said I picked up an STR-D665 for next to nothing and found the power supplies to be quite different (you would hope so any, with the ES meaning Elivated Standard and all) but with the D665 working flawlessly I'd rather have something working than nothing. Good luck!