[Hallicrafters] RE: Why is the R-42 speaker so expensive?

[jeremy-ca]

At least the battle is over and I dont have to keep watching Ebay. A R-42 
attached to another SX-62A followed me home today. The price was well below 
what just either piece would sell for on Ebay and included a mint TO Keyer 
and a pair of NIB 813's. The Red Sox won the division championship and I won 
a few more toys.

The R-42 is fully enclosed. There are enough screws holding the metal back 
cover on you would think it was for TVI. I havent taken it apart to see what 
the seperate internal wooden enclosure looks like.

Carl
KM1H


----- Original Message ----- 
From: "Julian Bunn" <Julian.Bunn at caltech.edu>
To: "Bob Young" <youngbob53 at msn.com>
Cc: <hallicrafters at mailman.qth.net>
Sent: Sunday, September 30, 2007 12:36 PM
Subject: Re: [Hallicrafters] RE: Why is the R-42 speaker so expensive?


> Yes Bob, you are absolutely correct about speakers in general, but I was
> not speaking in general, I was talking specifically about the R-42. The 
> R-42
> is essentially an open box design.
>
> Julian
>
> Bob Young wrote:
>> Cabinet design has a huge impact on the sound of a speaker. A bass reflex 
>> cab is tuned somewhere at or above the resonant frequency of the driver 
>> inside, they are much more efficient and have much better bass response 
>> than an open back cab with the same driver. These cabs take the back wave 
>> of the driver and put it in phase with the front wave and release it 
>> through a port usually below the speaker in front reinforcing the bass. 
>> Open back cabs cancel most of the lower bass because the back and front 
>> waves are out of phase with each other, ever listen to a driver that is 
>> not in a case, no bass at all due to out of phase cancellation. The only 
>> draw back to a bass reflex speaker is they drop off rapidly below the 
>> resonant frequency of the port. Sealed speakers sound even better as 
>> their drop off is much more gradual, but they are less efficient as they 
>> pretty much keep the back wave right in the cab itself. Many different 
>> cab designs. I don't know if this is anything to do with the price 
>> however.
>>
>> Bob
>> KB1OKL
>>
>> Message: 4
>> Date: Sat, 29 Sep 2007 18:42:17 -0700
>> From: Julian Bunn <Julian.Bunn at caltech.edu>
>> Subject: Re: [Hallicrafters] Why is the R-42 speaker so expensive?
>> To: jeremy-ca <km1h at jeremy.mv.com>
>> Cc: hallicrafters at mailman.qth.net
>> Message-ID: <46FEFEF9.4020302 at caltech.edu>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> I think the sound is good simply by virtue of the size of the driver.
>> The cabinet probably has
>> minimal or no effect on the acoustics, IMHO.
>>
>> No idea why they are so expensive ... I picked mine up very reasonably
>> from a chap who
>> was selling an SX71 and it came with it.
>>
>> Julian
>>
>>
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