Monstrous power you can shape any way you want.

The Theta Amp Head offers a unique approach to the guitar amplifier, providing two selectable input pre-distort preamplifiers. Using the Theta guitar amplifier head is like having two low-noise, extremely high quality preamp pedals at the input of the amplifier. Each front-end pre-amp has gain, bass, mid level, mid sweep and treble which provides amazing pre-distort tone shaping. The amplifier's "Clean" and "Distort" circuits have the same post distort tone shaping. Tone beyond your wildest dreams! Extreme sonic flexibility. The Clean channel has additional tone shaping with the inclusion of a Presence control, providing more than 20dB of high frequency boost. You want gain? The Theta amplifier head has greater than 140dB of gain and you can control and make it useable because of the included dual independent full-featured Decimator Noise Reduction systems.

The Theta incorporates Dynamic Saturation Modulation™, which delivers the actual feel of a saturated tube power amplifier. The Theta also packs a huge punch; the internal D-CAT power amplifier delivers more than 300 watts RMS into a 4-ohm load and 150 watts into an 8-ohm load. Derek Bowers, renowned IC design engineer from Analog Devices and Buck Waller of ISP Technologies, developed the patent pending D-CAT power amplifier technology. The D-CAT is a super high current power amplifier technology capable of driving a .5-ohm load. This means that the D-CAT amplifier delivers excellent transient response and punch.

ISP Technologies Theta 300W Guitar Amp Head Features:

• Dual Amplifiers Clean / Distortion
• Clean Channel Controls Presence Bass Mid Mid Sweep Treble Decimator Reverb Output Level
• Distortion Channel Controls Gain-Bass-Mid-Mid Sweep-Treble-Decimator-Reverb-Output Level
• High Quality Digital Reverb
• Dual Input Preamplifier
• Both Preamplifier Controls Gain-Bass-Mid-Mid Sweep-Treble
• Solo Boost
• Effects Loop
• 300 Watt RMS D-Cat Power Amplifier

Sound that's bigger than big! Call or click today to order.

ISP Technologies Theta 300W Guitar Amp Head Specifications:

• 45 lbs.

ISP Technologies Theta 300W Guitar Amp Head

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Average of 10 User Ratings

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HIGH FIVE BRO!

Posted by High Fiver from Western Missouri on May 5, 2009

Experience w/product: I own it

Reviewer's Background: I'm in a band

Reviewer's Play Style: Metal

This is the best solid state amp ever made. Even the JC 120 does not compare. The Theta delivers beutiful cleans and the most hellish distortion that has ever been. You can dial in a nice open raw JCM800 tone or turn the sweep control and get a nice compressed Rectifier sound except with even more gain.

My friend Sean and I high five over this thing for hours. Buy it. It will blow your face off.

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Great for Extreme Metal

Posted by Necrocenturion from Bloomington, MN on Nov 17, 2008

Experience w/product: I own it

Reviewer's Background: Active Musician

Reviewer's Play Style: Death, Black, Grind, Thrash, Doom.

The ISP Theta head is a powerful beast. 300w solid state is nice when you want to be heard, especially if you're the only guitarist in the band. I've been using a peavey JSX for the last 5 years until I found the Theta head. Very clear distinct distortion and clean channel. The only flaw I think is the fact you have to use the footswitch to use the preamps, FX loop, solo boost, and reverb. Its a great plug and play amp. You can use the distortion right out of the amp without using any of the preamps and get a nice decent distortion. I like to add a lot of rack effects to the clean channel, create my own brutal sound, and make use of its 300w of non-tube power. Sounds like a tube amp without the temporary tube life. Doesn't sound pixilated or digital like a Randall Cyclone. The "Decimator" noise gate is the best. Better than the Hush super C. Stops and Starts are like turning a switch on and off. The Theta head works great with a Marshall 1960 4x12 cab (75w Celestions). Very brutal!

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ISP Technologies Theta

Posted by Anonymous Musician from New Mexico on Jul 14, 2008

Experience w/product: I own it

Reviewer's Background: Active musician

Reviewer's Play Style: Metal

After shopping around for a new amp for probably about 6 months, and trying almost anything I could possibly get my hands on, I found this. I was very impressed with the specs so I said hey I'll try it and return it if it's not good. Turns out it's better than any amp I've ever played. No marshall, krank, mesa boogie, or peavey can compare to the quality of not only the distortion but the clean channel is flawless. Any style can be played on this amp. I use it for metal or smooth jazz. Everything sounds Great!

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incredible

Posted by genocide roach from co springs, co on Feb 19, 2008

Experience w/product: I own it

Reviewer's Background: active

Reviewer's Play Style: black metal, death metal, etc.

ive played many show worthy guitar amps. mesa triple rec, marshall jvm, peavy 6505, ashdown fallen angel, hughes and kettner switchblade... they all have their pros and cons. but the problem i always came across is that i had to chose between a good distortion tone or a good clean tone. both are incredibly important to me, and this amp delivers.

the 2 seperate pre amps give you 2 distinc tones. the first gives you really tight and articulate sound. the second gives you more fuzz and feedback, for a more old school feel. both channels have incredible amounts of gain. i use preamp 1 99% of the time.

the distortion crushes and but is still defined. and the clean is beyond anything ive played, even a fender.

lastly, the reverb on this head is fantastic. many of the heads i was looking at didnt even have reverb built in.

get this amp, its worth the cash.

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Finally!!!

Posted by Frankie the Brutal from Kansas City, MO. on Dec 30, 2007

Experience w/product: I own it

Reviewer's Background: Active Musician

Reviewer's Play Style: Bleusy Death Metal

I've been playing for around 12 years or so and have played so many differant amps; Peavey 5150, Marshall tube and solid state amps, Crates, and Mesa Boogie. Now finally I've found in the ISP(intelligent signal processing) Technologies Theta head exactly what I want to sound like.

I play my own brand of bluesy death metal. I play an old Gibson SG1 and a Gibson '67 Flying V Reissue. I needed an amp with a nice clean channel and an absolutely evil high gain channel. The ISP Theta is it. The clean channel is stunning and beutiful. If you use the built in pre-amp you can get just the right amount of break up for a bluesy clean, a lot like using a great overdrive like a tube screamer or a Maxon only much more musical sounding. The dirty channel has more gain than any other amp I've ever played. The distortion sounds amazing, it's not wimpy and thin like other solid state amps I've played. If you played this amp blindly you would be hard pressed to believe it isn't tube driven. This is not a modelling amp like a Line 6, this amp is it's own beast. If I had to pick an amp it sounds like I would probably say an old Mesa Boogie Dual Rectifier except this amp has more gain, more tone shaping capabilities and a better clean channel.

The folks at ISP have finally done what we all thought was impossible. They have finally produced a solid state amp that sounds better than tube amps. I had lots of questions before I bought this amp so I contacted ISP and they couldn't have been better to me. Musicians Friend has a great deal on a truly boutique amp so buy this now before the guy next door one ups you.

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ISP Technologies Theta 300W Guitar Amp Head

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