[slinkelist] Re: Sony DE135's (was: Re: DXS pricing And other issues)

[Jack Wheaton]

OK... About the DE135. It is indeed wired in series when A+B speakers are
switched on. This is not a good situation. When speakers are wired in series not
only do you hear a significant decrease in volume but you also have the problem
that the electrical properties of the first pair in the series are affecting the
second pair.  The quick and dirty fix is to use an autoformer available from
many manufacturers for prices varying from about $80 to $300. Abandon the A/B
switch and buy an outboard switch. or... put an autoformer volume control on
each pair of speakers.. This will eliminate the problems inherent with series
wiring. There will be a slight decrease in volume to all speakers but it won't
be as apparent. I have successfully used the DE135 to power as many as 8 pairs
of speakers this way. Good for low to moderate volume listening.

By the way..anyone intersted in the audio aspect of these systems.... feel free
to email me for a quote on any hardware pricing. Cheap!!!
Jack

\
Dave Kolb wrote:

> How right you were - I wish I knew more about electronics. I wish others did
> too!. I asked about this to the sales folks and they of course said no
> problem. I thought I was going to get 4 channels not 2 in series.
>
> Indeed when I attached both sets of speakers to the receiver, the volume
> control or on/off in either room would affect the other room. Also if I turn
> either A or B off at the receiver, the other set gets notieably louder.
>
> I'm going to reconsider what I'm doing.
>
> Thanks,
> Dave
>
> -----Original Message-----
> From: Jon Welfringer <Welfringer@Access1.net>
> To: Dave Kolb <davekolb@email.msn.com>
> Cc: Slinke-List <slinkelist@nirvis.com>
> Date: Friday, October 22, 1999 1:09 PM
> Subject: Re: Sony DE135's (was: Re: DXS pricing And other issues)
>
> >Dave,
> >
> >A couple of items to note about the DE135's you are looking at:
> >There are only 2 channels of 100W, not 4.  The speaker outputs only
> >handle 8 Ohm loads, not 4 Ohm.  The speaker outputs are wired in series
> >to allow the attachment of 4 speakers and not drop the impedance to 4
> >Ohms, thus the impedance level will rise on the amplifier which in turn
> >will decrease the output (half).  This setup will not give you high
> >output sound, but will give you a moderate volume level that could still
> >be appropriate for decent listening levels.  Also, I would be vary
> >cautious about using downstream volume controls or A/B switches.
> >Measure the resistance on any devices you place in-line with your
> >speakers and amps.  You will need to make sure you don't overload these
> >amps on their outputs (impedance too high or too low).  These are entry
> >level amps and not built to sustain long heavy loads.
> >
> >That said, as long as you keep everything balanced, you should have
> >great full house audio.
> >
> >- Jon
> >
> >ps. I am by no means an expert on this, but I did research those amps
> >for my own setup.
> >
> >
> >
> >Dave Kolb wrote:
> >>
> >> michael
> >>
> >> <snip>
> >> >I think DXS is great.
> >> I agree but can't see it in my setup yet unless it were to switch line
> level
> >> to speaker level.
> >>
> >> >Because usually (in sony) amps the are lots of unused inputs (who needs
> >> >a tuner, or tape) and with cdj you can easily program amp to switch
> >> >input channel in amp according the current player.
> >> <snip>
> >> >What I'm Hoping from DXS is that it would take care of all my A/V
> >> >switching and DSP (surround), so in addition to DXS (and sources) I
> >> >would only need a half dozen AMPs. And with AMPs I mean those big black
> >> >boxes that haven't got any other controls than Power On/Off switch.
> >> <snip>
> >>
> >> Where can you get a pure amp anywhere close to the price (much less
> cheaper)
> >> of one of the DE135 receivers where I get 4 100W channels and 4 inputs
> with
> >> a builtin tuner? The only one made are for the audiophile and arguably
> >> overpriced for their function. It woud be quite a bit to drive 10 speaker
> >> pair with high end amps. I'm not an audiophile or EE type and so am not
> >> overly familiar with what's available or what can be done.
> >>
> >> Thanks,
> >> Dave
> >>
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