Bubo
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Posts posted by Bubo
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IV sounds better on paper
I haven't auditioned them
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DIY and others sell a DC protection circuit for the speaker outputs, that you might be able to use in your system to eliminate the thump ans protect the cornwalls
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Looks like there is plenty of repair porn on youtube for your unit
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1 hour ago, januacoeli said:
Would you advice also applying dioxit on the balance, treble and bass knobs, even though there is nothing strange about them and they are less used?
Yes clean all of the carbon disks thoroughly, you will be glad you did.
If you love your unit, and see another for sale that is working at a low price, you may want to keep it in a closet as a future organ donor
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Over time the carbon disks (potentiometers sp) get some dirt, smoke, oxidation etc on them
and this effects their resistance and creates noise as the wiper travels over the impurities.
Electrical contact cleaner washes the grit off, CRC is good and affordable, Deoxit seems to be the king of these products, it has worked well for me.
Put some paper towel or good quality rag around the area you are cleaning to absorb the over spray and mess coming out, then repeat 24 hours later.
While you have the lid off, blow the unit out with compressed air, and use a magnifier to examine the solder joints, also check the boards for electrolytic capacitor leaks and hot spots.
You and also check the transistors to see if any are running hot, without electrocuting yourself. If you have a friend that works on electrical equipment of any kind they can help you.
If the unit is approaching 30 years old, and you love it, get some quotes to replace all of the electrolytic capacitors before one fails and burns a path across your transistors and other components. Usually in the $200-300 range to replace all inc the filter caps with top quality panasonics, nicicon etc. Also have the relay switch-s replaced, they pit and fail over time.
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Depends on your power from the city.
80ft from my home in my yard is a giant city power transformer.
I do have under and over voltage and surge protection on everything inc my AC system.
My first surge suppressor is installed in the Breaker box and connects to both rails.
There may also be some budget bench power supplies that you can use.
1 to 1 transformers don't cost much if you are worried about DC
Go to Amazon (and your fav search engine) and enter "isolation transformer", the ones labeled Medical may have some Std they have to meet so they don't snuff granny by feeding bad power to her medical device. May save the life of your stereo too.
I'm not sure how switchers handle noise and voltage problems, but conventional Transformer, Diode, Capacitor systems in addition to being heavy and bulky are very robust.
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Did Akai have any US sales other than the PX ?
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3 hours ago, Chris A said:
Cornwall IV controls its vertical polars to about an octave lower than the RF-7 III, which means you'll have significantly more clarity.
3 hours ago, Chris A said:When I sample speakers, my quick test is Ronstadt Skylark CD quality, first 30 secs
If the singer doesn't impart feeling, the speaker/system is losing something.
When the girls turn the Wyles on, you should feel it at Emotional level.
I had a friend who wanted to know the differences between various gear and source formats;
I used a Sheryl Crow tack starting at Youtube Vevo , different encoding, first on headphones, then different amps, and different speakers. Ending on LaScalas + McIntosh + DTS 48K Hz DVD source
Some of my Yamahas sound even better, but I didn't want to start moving Amps around.
Each step he liked it more than the previous version
When we got to the last version, I asked how does it sound now ?
"Like she is sitting on my lap and blowing in my ear"
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Cornwall 4, Mid x-over Mid 700 Hz, High 5,000
34 Hz -20K Hz
LaScala 2, Mid x-over Mid 450 Hz, High 4,500
50- 20K Hz
3db louder at 1W 1M
Cornwall has better Mid Horn Design. Is it audible and can it be forced.
LaScala captures more, most voice except for the lowest tones, on the mid driver with the lower crossover point. Same question, is it audible and can it be forced.
The world of design trade offs,
driver alignment, Horn geometry, crossover points, freq response, cabinet size and shapes ........
Voice frequencies, crossover points, drivers
In Telephony the Networks are designed around 300-3,000 Hz ideal for male voice vs bandwidth trade offs, 4k would have been better for female voice. foundational science and engineering all male engineers with male voice test tapes, female voice oversight rolls them off at 3k
First, one line per voice
Second, Frequency division multiplexing of digitized voice
Third, Time Division Multiplexing with significant over-speed and buffering
Fourth, High speed asynchronous optical packet voice with buffering
Frequency band
" In telephony, the usable voice frequency band ranges from approximately 300 to 3400 Hz.[1] It is for this reason that the ultra low frequency band of the electromagnetic spectrum between 300 and 3000 Hz is also referred to as voice frequency, being the electromagnetic energy that represents acoustic energy at baseband. The bandwidth allocated for a single voice-frequency transmission channel is usually 4 kHz, including guard bands, allowing a sampling rate of 8 kHz to be used as the basis of the pulse code modulation system used for the digital PSTN. Per the Nyquist–Shannon sampling theorem, the sampling frequency (8 kHz) must be at least twice the highest component of the voice frequency via appropriate filtering prior to sampling at discrete times (4 kHz) for effective reconstruction of the voice signal. "
Great content from a Microphone manufacturer
Important frequencies
The important frequencies in non-tonal (Western) languages are illustrated by the diagram below. Here, the frequency band around 2 kHz is the most important frequency range regarding perceived intelligibility. Most consonants are found in this frequency band.
A speech spectrum is either high-pass or low-pass filtered. Using an HP filter at 20 Hz (upper left) leaves the speech 100% understandable. (This is because the complete speech spectrum is there). An HP-filter cutting everything below 500 Hz still leaves the speech signal understandable. Even though most of the speech energy is cut out, the intelligibility is only reduced by 5%. However, applying a higher cut-off makes intelligibility drop.https://www.dpamicrophones.com/mic-university/facts-about-speech-intelligibility -
Any of the Heritage you will be happy
Each is a different speaker philosophy with its own trade offs.
Cabinet size wasn't a limitation for any of the Heritage designs, it is with all home theater designs.
Basically same cabinet dimensions as Movie theaters, where sound is everything.
Read the threads on the Forte 2 and 3s and you tube reviews, little placement sensitive but the best sleepers on the market. F3 appears to have been well received by critics and users in the market, who had forgotten one of the great designs.
If you can score a pair of LaScalas you will never look back.
Run great with a low power Class A amp, 20 watts is plenty
.2 watts is loud listening, .5 watts screaming, 2 watts hearing loss.
Best for vocals compared to any speaker.
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If it's under warranty send it back, blown speaker ?
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Power supply or amp problem
Reverse the inputs to your Promedia amp and see if the problem moves to the other speaker
If the problem remains the same, the system needs to go to the shop, est $150 for any repairs
Currently 100 for a new system at Costco on sale now
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What is your budget, and size requirements
What is the power of your amp
How deep are your shelves ?
If they will fit, Hersey 1s upright, and declare victory for $400
Synergy B3s sound great and can be had for $50-100 pair used
4 B3s with a C3 Center makes a good surround system for little $$
Get a good used surround amp that is AB, and supports direct mode. $100-200
Run it in stereo Direct for Hifi, some are as good as 120db SN in direct from the DAC to the Amp section
Connect devices to it via glass tosslink for optical isolation, maybe a Bluetooth receiver with glass out for $30
Non direct, you can use a microphone to set up the internal EQ and room adjustments
Pioneer Elites and Yamaha's come to mind, Yamaha's are unusually clear sound, why I own so many of them.
Parts express sells good mics for not much, ask the guys on the forum for suggestions
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On 9/22/2020 at 10:07 PM, Walter B said:
I own a pair of heresy's I purchased vin 1977. Long story short is they were urinated on by dogs we used to Foster. The horns are corroded and the finish came off. They still sound ok and the interiors are like new. Any suggestions on how to restore them? I appreciate and answers.
Walter B.
Easy Cabinets to make
Have a local cabinet maker, make you a pair.
Or a friend with a table saw, and decent wood working skills. Measure internal dimensions for copy.
Existing motor board can be the template to trace onto the new motor board, to trace the cut outs for the drivers.
Grill cloth available from Crites, canes are popular, Crites may offer new grills, ask, also offers slant risers, or make your own regular risers using the ones on the existing speakers for the template
Parts Express, has a good choice of speaker terminals that are better than the ones provided in the H1s
Stain, raw birch plywood or veneer is a cost consideration
Check the Photos on line, but Canes and Cherry Stain or veneer might look nice.
Ask on the forum, someone sells the klipsch logos for the grills
If the metal horns were peed on, so were the woofers
Horns can be cleaned, sanded with fine steel wool or fine sandpaper like 400 wet, and painted.
Mid range drivers need a new gasket, or you can send them to Crites to get new diaphragms, test the magnets and send them back with new gaskets.
The tweeters are probably OK, but better ones are available from Crites and others, tech has progressed.
Woofers, Crites sells some, there are probably some on the forum used that someone will sell you if your ask, and there are low cost replacements on the market, but it takes some searching. I think Newark had one
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On 9/23/2020 at 2:03 PM, henry4841 said:
I have built all that have been published and many of the Zen versions as well. Recently had 7 complete ones running. Not at the same time of course.
This zen ?
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A B AB D T
The world of trade offs on any engineering design
With the Heritage - retro Klipsch the efficiency makes the A decision
more affordable and a reasonable weight
.5 watts on the LaScallas is screaming, 2 watts is unbearable in my space
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17 hours ago, DizRotus said:
You’ll have better luck searching for “Dual.”
Are you challenging me ?
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4 hours ago, richieb said:
More heat yes, forklift required not necessarily. You may be well familiar with Pass First Watt amps that all use Class A, all built in the same chassis for cost effect. Due to the same chassis for each circuit variation, power is relegated to the cooling capabilities of said chassis. The FW are hefty but certainly not heavy when compared to his Pass Lab products in which you are correct - forklift worthy.Thinking of building a kit FW
After I finish my other projects, which will be in ......
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You have already done the tweeters, and banana plugs are nice to have
Install new gaskets for the K 55
Crites replacement crossovers aren't much more than new capacitors
I would just replace the crossovers with the cost so close.
Maybe a piece of synthetic batting in the bottom of the speaker for damping. Something from a fabric store.
Go over the cabinets with some Watco Natural Oil to freshen them up a bit
Inspect the wiring and surround on the woofer.
Stop, declare victory and open a beer.
Every time I turn on my H1s, they sound great for 45 years running.
They are an engineered product,
some progress made in tweeter land since they were designed, so the upgrade may sound better.
The next bump up for the money would be a pair of used Forte 2s or LaScala 1s
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If they are not connected to the source, do they still have static ?
If you change the source is the static still there ?
Could be bad on board amp
Check the wiring twice, 90% of all failure are the wires and connectors.
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These are the best deal going in new, 3 versions available
but fully manual
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Look at Duel on e-bay and craigslist etc
Search by distance nearest
I scored a Duel direct exact model I wanted 30 miles from home for 150 a couple of years ago
Semi auto direct drive
Doesn't have to be the Uber model to be good, my 604 tracks with the best made
Don't buy some beater or broken cover etc.
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Birch looks nice in natural if you can get the paint off
WATCO oil works
The cabinets are easy for someone who knows how to veneer, which opens up a lot of possibilities.
Local Cabinet makers should be able to do it, or recommend their outsource veneer guy
Also ask at your local furniture store or antique store who their veneer guy is....
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H 2s are selling for $600-800 on ebay,
just looked at the sold listings
Cornscala or CW4?
in 2-Channel Home Audio
Posted
If you have the parts already and the woodworking skills and equipment
Why not do a CS Build, and see how you like it ?
Worst case you are out a few sheets of MDF or birch plywood.
There are plenty of other builders you can read before starting.
YMMV