Four Channel (QuadroSonic) LPs...

[losiphile]

How do you play these kind of LPs to get the four channel sound? Although they're playable in stereo mode.

Thanks.

[sandawa]

kailangan mo ng decoder sir. ang tawag dun noong nagsismula ako, four channel matrix decoder. yung ibang brands meron talagnag 4-channel receivers ang nakita ko rito nuon yung Sansui, Pioneer, and US brands.

ang alam ko pati cartridge mo dapat 4-channel din. hindi ko lang kabisado ang technology dahil greenhorn pa 'ko nung '80s. itong lumang Kenwood receiver ko (KR 7400) - may input output jacks siya for 4-channel decoder.

[losiphile]

sandawa said:

kailangan mo ng decoder sir. ang tawag dun noong nagsismula ako, four channel matrix decoder. yung ibang brands meron talagnag 4-channel receivers ang nakita ko rito nuon yung Sansui, Pioneer, and US brands.

ang alam ko pati cartridge mo dapat 4-channel din. hindi ko lang kabisado ang technology dahil greenhorn pa 'ko nung '80s. itong lumang Kenwood receiver ko (KR 7400) - may input output jacks siya for 4-channel decoder.

Sandawa,

Thanks. Do they sound good even in stereo mode or mas maganda sila sa 4-channel listening?

losi_phile

[sandawa]

it sounds better on 4-channel, talagang naghihiwalay and mga instrumento pero, what i remember is that the sound is louder on stereo. parang yung HT receivers using two transfos to power two channels but forced to come out with four to six pairs of speakers due to internal processing.

karamihan pati ng 4-channel LPs na nabenta nuon talagang pang showcase. yun bang iparirinig sa yo yung paghihiwalay ng sound. if you play this on stereo, you'll hear some background sound on one of two channels na comparatively soft. usually yun ang sound reserved for the surround channels.

actually, may alternative diyan si David Hafler, yung Hafler matrix, which is similar to the pro-logic system. ang alam ko meron pang available websites on Hafler matrix set up, pero hindi compatible yun sa 4-channel Quadrasonic circuit.

[stereophile]

losiphile said:

Sandawa,

Thanks. Do they sound good even in stereo mode or mas maganda sila sa 4-channel listening?

losi_phile

I own a couple of 4-channel LPs. Yes, you need to use an amp w/ a 4-channel decoder, and 4 speakers. This was the predecessor of HT systems. I almost owned a Marantz w/ a decoder, but it's age was showing as was wear and tear. It had problems. I let it go.

In stereo playback, there is slightly less gain, so you have to increase the volume levels, otherwise, they are also well-recorded.

[losiphile]

Sandawa, Stereophile:

thanks for the reply. I'll try listening to those background music when I get home tonight.

losi_phile

[avphile]

sandawa said:

kailangan mo ng decoder sir. ang tawag dun noong nagsismula ako, four channel matrix decoder. yung ibang brands meron talagnag 4-channel receivers ang nakita ko rito nuon yung Sansui, Pioneer, and US brands.

ang alam ko pati cartridge mo dapat 4-channel din. hindi ko lang kabisado ang technology dahil greenhorn pa 'ko nung '80s. itong lumang Kenwood receiver ko (KR 7400) - may input output jacks siya for 4-channel decoder.

The true discrete quadraphonic CD-4 pioneered by JVC Victor required a special stylus geometry plus an extended frequency response to at least 40khz to accommodate the carrier signal that carries the added 3rd and fourth channels, if i recall right. Those elliptical and conical geometries common in stereo pick-up simply can't hack it and requires some enhancements that resulted in the so-called Shibata stylus. This stylus serves stereo reproduction much better considering its increased stylus -to-groove contact area needed for 4-ch reproduction.

I am not so familiar with matrized quads except to recall that two companies vied for market dominance: Sansui's QS and the CBS/SQ systems. (or was it the otherway around?) Also, it didn't require any special stylus to play but the separation of channels wasn't as good as in the CD4 format.