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JBL 4648's and tubes [message #34959]

Sat, 02 February 2002 09:10

spkrman57
Messages: 522
Registered: May 2009

Illuminati (1st Degree)

Wayne, I keep hearing forum posters refering to "plate amps" for the 4648's. Are they referring to (tube/valve) amps????????? Also, noticed when I ordered crossover (parts express) (1k6 - for 4 pi), that you can order hi-pass only. Could be cost savings for anyone who has some 1 mh coils already. I plucked mine out of AR2-AX speakers, very nice air core around 1.1 mh. If the bulbs (protection) go out (aerospace bulbs???) can I just remove from the circuit (short out bulb connection - assuming series connection)???? I ordered 4 today for total of $105.00. Checking out prices of individual parts, I'm only getting them because they have parts mounted on pcb. I am waiting to see quality of coils and caps. Oh well, enough of my opinionated self. Regards, Ron

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Subwoofer Amps! [message #34960 is a reply to message #34959]

Sat, 02 February 2002 09:42

Robert Hamel
Messages: 93
Registered: May 2009

Viscount

They work great and you can get them from several sources. I used Parts Express. They are solid state and the ones I am using are for a pair of Le-14A's for stereo subs. The amps are quiet as hell with plenty of power. The adjustable phase control was also a life saver form me getting it all phased properly. Check them out.

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the coils from my AR-2x's were only 18 ga., [message #34961 is a reply to message #34959]

Sat, 02 February 2002 12:43

Sam P.
Messages: 307
Registered: May 2009

Grand Master

about an ohm DCR and 1.27 mH inductance. Used with about 14.3 uF of cap (solen), they made nice 1200 Hz. series xovers between the 4648a-8's and altec 511/902-8b's. Very minimalist, and the sound is as good or better than the pair x'd at 600 Hz. w/ normal BW's(12 dB/oct). Sam

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Re: Subwoofer Amps! [message #35007 is a reply to message #34960]

Thu, 07 February 2002 09:36

spkrman57
Messages: 522
Registered: May 2009

Illuminati (1st Degree)

Robert, Which model are you using????? Parts express has a 250 watt for approc $130, is that the one you have???? Its the only one I saw with class AB configuration. Regards, Ron

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