Messages

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HiFi Audio Equipment Discussion / Re: Nordost,Cardas,Kimber,MIT, spk cable,I/C, PC electrical properties (L,C,R)

« on: January 08, 2017, 03:11:32 PM »

Just do a quick measurement of the Nordost speaker cable:

Blue heaven:
Freq = 1Khz , L=3.3uH , R=0.06 Ohm ,  when speaker wire coil together and measured as  L=11uH , R=0.06 Ohm

Heimdall:
freq = 1 Khz, L=3.55uH , R=0.04 Ohm

From this measurement , it can be concluded that higher tier cable of same brand  the resistance will be lower, and don't laugh at some user that use clip to float the cable in air, as by doing so they just reduce the self inductance of the speaker cable. But actually all u need to do is just lay the cable straight so that it does not cross and the cable inductance will reduced. Also as the cable resistance is extremely low, it makes sense to have the speaker contact clean properly and remove the oxidation so u get the best low resistance contact.

In the other thread I was inform a 0.0xOhm speaker cable resistance was high. If so, then most of the speakers cables have similar resistance levels. If so, can't be high right? Should be more like average, based on your test results.

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HiFi Audio Equipment Discussion / Re: Bi-wiring - Yea or nay

« on: October 18, 2016, 01:29:40 PM »

What multimeter do you use? Most digital multimeters are up to 2-decimal points only.

Or was the 0.0001 reading when the selector was at the kOhm setting? If so it is 0.1 Ohm - see http://www.convertunits.com/from/ohm/to/kiloohm as when you enter 0.1 Ohm it is converted to 0.0001 kOhm

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HiFi Audio Equipment Discussion / Re: Bi-wiring - Yea or nay

« on: October 18, 2016, 09:38:43 AM »

yes, the two set of speaker terminals are connected to the same amplifier output in parallel. For most well design speaker cable the resistance is below 0.001 Ohm so is a small fraction of the actual speaker impedance of 4 or 8 Ohm. Thus I believe the benefit of bi wiring is from the extra inductance or capacitance of the second set of speaker cable that improve the sound and also isolated path of current driving woofer and tweeter circuit.

Since you have the SPICE tool, curious to know if it show the above? Only know of NAIM gear which have their own NACA requirement to induce capacitance.

And your mention of the  0.001 Ohm resistance rating for the cabling - what length and thickness is that with reference to? Even better if you can provide info regarding the make and model of such a low resistance cable. Even silver cabling I measured using a multimeter is about 0.2 Ohm per meter.

Resistance wise, there is this article at http://www.audioholics.com/audio-video-cables/speaker-cable-gauge

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HiFi Audio Equipment Discussion / Re: Bi-wiring - Yea or nay

« on: October 17, 2016, 09:32:27 AM »

Never have experience with bi-wiring as all my speakers in the past is single wiring configuration.

Why speakers makers make bi post anyway?  Any benefits?

In theory, this allows reduced interaction between the bass and high frequency units. Apart from the benefits of tuning using separate cables already mentioned by jb, you can also bi-amp, i.e. use separate amplifiers for the high frequency and low frequency units.

I asked a very prominent designer once on his thoughts on bi-wiring (his speakers use bi-wiring terminals). His answer was interesting ... he said he provides this because this is demanded by the market, not because of any technical benefits.

On a good day, bi-wiring brings about gains in transparency, and separation. On a bad day, the two drive units end up sounding disjointed and uncoherent. This results seems to me to be quite speaker dependent.

If you ask the repair technician (or if you know how to read schematics) about how the AB speaker switch works in any amp, they will tell you Spkr-A is driven by the same amplifier components as Spkr-B.

Hence if you use Spkr-B as well as Spkr-A, you basically double your resistance profile to each spkr - reason why the manufacturers manual always advise regarding speaker impedence if using both A&B at the same time. This is before you include the resistance from the 2nd set of speaker cabling for Spkr-B.

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HiFi Stereo Equipment Sale forum / FS: Musical Fidelity X-LINX "no-nonsense" intercon

« on: October 03, 2016, 10:44:35 AM »

Pair of rarely available Musical Fidelity X-LINX "no-nonsense" interconnect cables.

$58

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HiFi Stereo Equipment Sale forum / FS: Valve SET EL34 int amp

« on: September 20, 2016, 09:23:47 AM »

Runs hot in Class-A.

My set is the PRC OEM 240V version of this item on Amazon which is in USD at https://www.amazon.com/Nobsound-Amplifier-NS-13D-Vacuum-Handmade/dp/B00NWISSGU

Good reviews on the Amazon webpage as well.

SGD$250 and includes extra Russian valve as well as a multi-source selector to ease source selection. No phono stage. Only power cable included.

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HiFi Stereo Equipment Sale forum / FS: Altec Lansing ACS33 - 2.1 (for PC)

« on: September 20, 2016, 09:06:16 AM »

Good sounding and popular 2.1 model for PC.

Works fine. Selling as under utilised.

$45

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HiFI Audio Equipment Review forum / Re: Kontak Audio Cleaning Fluid

« on: September 19, 2016, 09:17:55 AM »

hi, anyone could recemmond other brands of contract cleaner? Kontact is out of stock when i called the shop last two weeks. date of shipment arrival could not be advised.

I found at ntuc fp, Selleys RP7, but it is of oil based, not suitable for hifi use. What is the brand for the so called 6.50 or other mid priced cleaners? thanks

Sorry $5.50 for 200ml spray (white can with blue band on base) as I got the price wrong. Bought it at a local hardware shop in the HDB areas. Quite easily found in many such shops.

Local SG brand JACKIE SPRAY 90 Degreaser&Cleaner For Use on Printed Circuit Boards, Magnetic Tapes, Electronic Relays, etc.

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HiFI Audio Equipment Review forum / Re: Kontak Audio Cleaning Fluid

« on: September 17, 2016, 08:29:58 AM »

OIC.

If so you then should checkout https://en.wikipedia.org/wiki/Rhodium and then ask why when you clean your Rhodium plated connectors, you can report a difference.

Only pure Rhodium is inert - chemical complexes can be reactive (as per listed under Precautions in the article).

One possibility is the Rhodium plating on the Cardas connectors is not pure Rhodium.

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HiFI Audio Equipment Review forum / Re: Kontak Audio Cleaning Fluid

« on: September 16, 2016, 05:50:54 PM »

Since our lives don't depend on it (not on airplane), a can of $6.50 contact cleaner from the neighbourhood hardware shop does the job as well.